mmaaiinn rreeppoorrtt && aannnneexxuurree · email : [email protected] website : ....

Improving & Revamping the Existing / Proposed

Water Supply Distribution System with Continuous

Pressurized Supply to Coimbatore Corporation

MMaaiinn RReeppoorrtt && AAnnnneexxuurree

VVoolluummee –– II ((aa))

JUNE 2013 APRIL 2017

FICHTNER Consulting Engineers India Pvt. Ltd.

Menon Eternity, 9th Floor, No, 165, St.Marys Road

Alwarpet, Chennai - 600018

Tel : +91 – 044 – 45932600, Fax : + 91 – 044 - 45932809

Email : [email protected]

Website : www.fichtner.co.in

Coimbatore Water Supply System Detailed Project Report - Revision I

Improving & Revamping the Existing / Proposed WSS JNNURM

i

List of Contents

Chapters and Appendices

LIST OF ANNEXURES

LIST OF DRAWINGS v

LIST OF TABLES xv

LIST OF FIGURES xviii

PROJECT SUMMARY 21

1 Sector Background, Context & Broad Project Rationale 25

1.1 Project Site Appreciation 25

1.1.1 Physical & Geographical Characteristics 25

1.1.2 Topography 26

1.1.3 Geology 26

1.1.4 Soil 26

1.1.5 Structure & Tectonics 26

1.1.6 Weathering 26

1.1.7 Alluvium & Kankar 26

1.1.8 Climate and Rainfall 26

1.1.9 Industrial Activities 27

1.1.10 Existing Status of Physical Infrastructure 27

(i) Status of Water Supply Infrastructure 27

(ii) Source - Pillur (Bhavani River) source 28

(iii) Source - Siruvani River Source 30

(iv) Present Water Distribution Zones 30

(v) Master Service Reservoirs 31

(vi) Service Reservoirs 31

(vii) Existing Water Distribution System 34

1.1.11 Seismicity 40

1.1.12 Groundwater Quality and Quantity 41

1.1.13 Financial Status of the Local Body 41

1.1.14 Sewerage Infrastructure 41

1.1.15 Sewage Farms 42

1.1.16 Storm Water Drains 42

1.1.17 Solid Waste Management 43

1.1.18 E-Governance 43

1.1.19 Web site 43

1.2 Existing Tariff and Cost Recovery 44

2 Project Definition, Concept and Scope 45

2.1 Project Area 45



ii

2.2 Scope of Work 45

2.3 Objectives 45

2.3.1 Objective: A 45

2.3.2 Objective: B 46

2.4 Selection of Design Basis 47

2.4.1 Flow Reliability Analysis on Pillur Source 47

2.5 Deficiencies of the Existing Water Supply System 51

2.6 Project Benchmarks 52

2.7 Need for the Project 52

2.8 Technical Solutions towards Project Benchmarks 55

2.8.1 Methodology for 24 X 7 WSS 55

(i) Back drop drawing 55

(ii) Operational Zones 55

(iii) District Metering Areas 56

(iv) Hydraulic Model 56

(v) Simulation of DMAS 56

(vi) Bulk Water Meters and Consumer Water Meters 57

2.8.2 Instrumentation for 24 X 7 WSS 57

2.8.3 Disinfection Process for 24 X 7 WSS 61

2.8.4 24 X 7 Customer Care Centre 61

2.8.5 Introduction of Volumetric Rational Tariff 61

2.9 Physical Infrastructure Components 61

2.9.1 Formulation of Design Basis 61

(i) Design Parameters 61

(ii) Population Projection 62

(iii) CDP Observations for Demand Projection 63

(iv) Topographical Survey 81

(v) Soil Investigation 81

(vi) Zoning of Distribution System 84

(vii) Distribution System Network 84

(viii) Consumption Peak Factor 84

(ix) Minimum Residual Head 85

(x) Utility of Existing Pipes 85

(xi) Network Analysis for Looped Distribution System 85

(xii) Elimination of Public Fountains 86

(xiii) Pipe Material 86

(xiv) Trench Size for Pipe Laying 87

(xv) Service Reservoirs 87

(xvi) House Service Connections 87

2.9.2 Field Investigations Done 88

2.9.3 Detailed Engineering Design - Feeder Main System 92

(i) Existing Feeder Main System 93

(ii) Existing Problems in Feeder Main Systems 95



iii

(iii) Proposed Feeder Main System 96

(iv) Proposed Feeder Main Alignment 97

(v) Appurtenances Proposed 113

1. Sluice Valve 113

2. Scour Valve 113

3. Air Valve 113

4. Flow Regulating Valves 114

5. Bulk Water Meters and Data Loggers 114

(vi) Observations on Hydraulic Design of Feeder Mains 115

2.9.4 Interlinking of Pillur MSR and Siruvani MSR 117

(i) Appurtenances Proposed 118

1. Sluice Valve 118

1. Scour Valve 118

2. Air Valve 118

2.9.5 Detailed Engineerign Design – Distribution System 119

(i) Zoning of the Project Area 119

1. North Zone 119

2. West Zone 120

3. South Zone 120

4. East Zone or Demo Zone I & II 120

(ii) Rezoned Boundaries 121

(iii) Propsoed Pipe Materials & Sizes 121

(iv) Service Reservoirs 140

(v) Abandoned Sumps & SRs 157

(vi) Appurtenances Proposed 157

1. Sluice Valve 157

2. Scour Valve 158

3. Air Valve 158

4. Pressure Control Valves and Bulk Water Meter 158

2.9.6 Automation of Distribution System – SCADA 159

(i) Introduction 159

(ii) Scope of work 159

(iii) System Design 160

(iv) Proposed System 160

1. SRs / GLSRs in Distribution Network 160

2. Central SCADA Station at MSRs 161

2.9.7 Clearances Required From Other Agencies 162

2.10 Environmental Impact Assessment 162

2.10.1 Objective of EIA 162

2.10.2 Legal and Policy Framework 163

2.10.3 Environmental Assessment and Review Process 163

2.10.4 National Regulations 163

2.10.5 Necessity for this EIA Study 166

2.10.6 Broad Paradigms for Mitigation Plan 167

2.10.7 Resettlement and Rehabilitation Issues 168



iv

2.10.8 Management of Noise Impacts 168

2.10.9 Managing Impacts due to Construction Machinery 168

2.10.10 Managing Impact of Air Pollution 169

2.10.11 Environmental Monitoring 176

2.10.12 Impact during Design Phase 178

2.10.13 Impact during Construction Phase 179

2.10.14 Impact during Operation Phase 181

2.10.15 Impact Identification Matrix 181

2.10.16 Environmental and Social Classification 183

2.10.17 Specialized Services for PMC and Quality Assurance 183

3 Project Cost 184

3.1 Basis of Costing 184

3.2 Land acquisition / Site Development 184

3.3 Physical Infrastructure Component Cost 184

3.4 Rehabilitation & Resettlement Cost 187

3.5 Project Costing 187

3.6 Annual Operation and Maintenance Costs 187

3.7 Institutional Strengthening 189

3.7.1 Training to be imparted 189

4 Project Institution Framework 191

4.1 Roles of Different Institutions 191

4.2 Roles and Responsibility Matrix 192

4.2.1 Role of the Government of Tamilnadu (GoTN) 192

4.2.2 Role of the Coimbatore Water Supply Sector 192

4.2.3 Role of the Coimbatore City Corporation (CCC) 193

4.3 Overall Financial Structuring of the Project 193

5 Project O&M Planning 195

5.1 Institution Framework (Organization & Operations) Strategy 195

5.2 Selection of O&M Operator 195

5.2.1 Preventive Maintenance 195

5.2.2 Quality of Materials 197

5.2.3 Maintenance of Service Reservoirs 197

5.2.4 Maintenance of Water Distribution System 197

5.2.5 Duration and quantity of supply 198

5.2.6 Quality of water received by household 198



v

LIST OF DRAWINGS

S.NO DESCRIPTION DWG NO

1 Index & Key Plan 10/1811150/WSS/WIN/001

2 Contour Plan 10/1811150/WSS/WIN/002

3 Ward Plan 10/1811150/WSS/WIN/003

4 Existing water supply system 10/1811150/WSS/WIN/004

5 Existing Feeder Main System 10/1811150/WSS/WIN/005

6 Existing Distribution System 10/1811150/WSS/WIN/006

Feeder Main Drawings

7 Proposed Feeder Main System - Pillur, Siruvani &

MSR Interlinking 10/1811150/WSS/WIN/007

8

Plan showing Pillur MSR Outlet Interconnections

& MSR SR interconnections at Bharathi Park &

Ramakrishnapuram

10/1811150/WSS/WIN/008

9

Plan Showing the Alignment of Pillur Feeder Main

- I (From Proposed MSR at Ramakrishnapuram to

Proposed SR at Bharathi Nagar - By Gravity)

10/1811150/WSS/WIN/009

10 Flow Diagram for Pillur Feeder Main - I 10/1811150/WSS/WIN/010

(sheet 1 to 2)

11 Longitudinal Section for Pillur Feeder Main - I &

Branches

10/1811150/WSS/WIN/011

(sheet 1 to 8)

12


- II (From Existing MSR at Ramakrishnapuram to

Proposed SR at Lakshmi Nagar Mill Colony - By

Gravity)

10/1811150/WSS/WIN/012

13 Flow Diagram for Pillur Feeder Main - II 10/1811150/WSS/WIN/013

(sheet 1 to 2)

14 Longitudinal Section for Pillur Feeder Main - II &

Branches

10/1811150/WSS/WIN/014

(sheet 1 to 6)

15


- III (From Existing MSR at Ramakrishnapuram to

Proposed Sump at Rakatchi Garden - By Gravity)

10/1811150/WSS/WIN/015

16 Flow Diagram for Pillur Feeder Main - III 10/1811150/WSS/WIN/016

17 Longitudinal Section for Pillur Feeder Main - III &

Branches 10/1811150/WSS/WIN/017

18


- IV (From Proposed Sump at Rakatchi Garden to

Proposed SR at Jai Nagar - By Pumping )

10/1811150/WSS/WIN/018

19 Flow Diagram for Pillur Feeder Main - IV 10/1811150/WSS/WIN/019



vi


20 Longitudinal Section for Pillur Feeder Main - IV &

Branches

10/1811150/WSS/WIN/020

(sheet 1 to 4)

21

Plan Showing the Alignment of Siruvani Feeder

Main - I (From Existing MSR at Bharathi Park to

Proposed SR at Housing Unit - By Gravity)

10/1811150/WSS/WIN/021

22 Flow Diagram for Siruvani Feeder Main - I 10/1811150/WSS/WIN/022

(sheet 1 to 2)

23 Longitudinal Section for Siruvani Feeder Main - I

& Branches

10/1811150/WSS/WIN/023

(sheet 1 to 4)

24


Main - II (From Existing MSR at Bharathi Park to

Proposed Sump at Sanganur Chinthamani - By

Gravity)

10/1811150/WSS/WIN/024

25 Flow Diagram for Siruvani Feeder Main - II 10/1811150/WSS/WIN/025

26 Longitudinal Section for Siruvani Feeder Main - II

& Branches 10/1811150/WSS/WIN/026

27


Main - III (From Proposed Sump at Sanganur

Chinthamani to Revathy Layout SR & Direct

Feeding SR's - By Pumping)

10/1811150/WSS/WIN/027

28 Flow Diagram for Siruvani Feeder Main - III 10/1811150/WSS/WIN/028

29 Longitudinal Section for Siruvani Feeder Main - III

& Branches

10/1811150/WSS/WIN/029

(sheet 1 to 2)

30

Plan Showing the Alignment of Pillur Siruvani

MSR Interlinking Main (From Existing MSR at

Ramakrishnapuram to Proposed GLSR at Bharathi

Park - By Gravity)

10/1811150/WSS/WIN/030

31 Flow Diagram for MSR Interlinking Feeder Main 10/1811150/WSS/WIN/031

32 Longitudinal Section for MSR Interlinking Main 10/1811150/WSS/WIN/032

(sheet 1 to 2)

Distribution System Drawings

33 Proposed Zonal Boundaries for Distribution

System 10/1811150/WSS/WIN/033

34 Plan Showing the Boundary of North Zone -

Distribution System 10/1811150/WSS/WIN/034

35 WS Distribution System Layout Plan - North Zone

- Avarampalayam SR (Existing) 10/1811150/WSS/WIN/035


- PRP Garden SR (Proposed) 10/1811150/WSS/WIN/036


- Jai Nagar SR - Zone A (Proposed) 10/1811150/WSS/WIN/037



vii



- Jai Nagar SR - Zone B (Proposed) 10/1811150/WSS/WIN/038


- Kamadhenu Nagar SR (Existing) 10/1811150/WSS/WIN/039


- Kamarajapuram SR (Existing) 10/1811150/WSS/WIN/040


- Karupayya Gounder SR - Zone A (Proposed) 10/1811150/WSS/WIN/041


- Karupayya Gounder SR - Zone B (Proposed) 10/1811150/WSS/WIN/042


- Nehru Street SR - Zone A (Proposed) 10/1811150/WSS/WIN/043


- Nehru Street SR - Zone B (Proposed) 10/1811150/WSS/WIN/044


- Peelamedu SR - Zone A (Existing) 10/1811150/WSS/WIN/045


- Peelamedu SR - Zone B (Existing) 10/1811150/WSS/WIN/046


- Ponni Nagar SR - Zone A (Proposed) 10/1811150/WSS/WIN/047


- Ponni Nagar SR - Zone B (Proposed) 10/1811150/WSS/WIN/048


- Gandhi Ma Nagar SR (Existing) 10/1811150/WSS/WIN/049


- Rakatchi Garden SR - Zone A (Proposed) 10/1811150/WSS/WIN/050


- Rakatchi Garden SR - Zone B (Proposed) 10/1811150/WSS/WIN/051


- Ramakrishnapuram SR - Zone A (Proposed)

10/1811150/WSS/WIN/052

(sheet 1 to 2)


- Ramakrishnapuram SR - Zone B (Proposed) 10/1811150/WSS/WIN/053


- Rathinapuri SR (Existing) 10/1811150/WSS/WIN/054


- Rayyapa Nagar SR - Zone A (Existing) 10/1811150/WSS/WIN/055


- Rayyapa Nagar SR - Zone B (Existing) 10/1811150/WSS/WIN/056


- RG Nagar SR (Existing) 10/1811150/WSS/WIN/057



viii



- Sanganur Road SR - Zone A (Proposed) 10/1811150/WSS/WIN/058


- Sanganur Road SR - Zone B (Proposed) 10/1811150/WSS/WIN/059


- VKR Nagar SR - Zone A (Proposed)

10/1811150/WSS/WIN/060

(sheet 1 to 2)


- VKR Nagar SR - Zone B (Proposed) 10/1811150/WSS/WIN/061

62 Plan Showing the Boundary of South Zone -


63 WS Distribution System Layout Plan - South Zone

- BSUP Layout SR (Proposed) 10/1811150/WSS/WIN/063


- Clock Tower SR (Existing) 10/1811150/WSS/WIN/064


- JK Garden SR (Proposed) 10/1811150/WSS/WIN/065

66

WS Distribution System Layout Plan - South Zone

- Lakshmi Nagar Mill Colony SR - Zone A

(Proposed)

10/1811150/WSS/WIN/066

67

WS Distribution System Layout Plan - South Zone

- Lakshmi Nagar Mill Colony SR - Zone B

(Proposed)

10/1811150/WSS/WIN/067


- Puliyakulam SR - Zone A (Existing) 10/1811150/WSS/WIN/068


- Puliyakulam SR - Zone B (Existing) 10/1811150/WSS/WIN/069


- Singanallur SR (Existing)

10/1811150/WSS/WIN/070

(sheet 1 to 2)


- Sivaram Nagar SR (Proposed)

10/1811150/WSS/WIN/071

(sheet 1 to 2)


- Thiru Nagar SR - Zone A (Proposed) 10/1811150/WSS/WIN/072


- Thiru Nagar SR - Zone B (Proposed) 10/1811150/WSS/WIN/073


- Town Hall SR - Zone A (Existing) 10/1811150/WSS/WIN/074


- Town Hall SR - Zone B (Existing) 10/1811150/WSS/WIN/075


- Valliammal Street SR (Proposed)

10/1811150/WSS/WIN/076

(sheet 1 to 2)



ix



- Vysial Street SR (Proposed) 10/1811150/WSS/WIN/077

78 Plan Showing the Boundary of East / Demo

Zone - I - Distribution System 10/1811150/WSS/WIN/078

79 WS Distribution System Layout Plan - East / Demo

Zone I - Siddhaphudhur SR - Zone A (Existing) 10/1811150/WSS/WIN/079


Zone I - Siddhaphudhur SR - Zone B (Existing) 10/1811150/WSS/WIN/080


Zone I - Tatabad SR - Zone A (Existing) 10/1811150/WSS/WIN/081


Zone I - Tatabad SR - Zone B (Existing) 10/1811150/WSS/WIN/082


Zone I - VOC Park SR - Zone A (Existing) 10/1811150/WSS/WIN/083


Zone I - VOC Park SR - Zone B (Existing)

10/1811150/WSS/WIN/084

(sheet 1 to 2)


Zone I - VOC Park SR - Zone A (Proposed) 10/1811150/WSS/WIN/085


Zone I - VOC Park SR - Zone B (Proposed) 10/1811150/WSS/WIN/086

87 Plan Showing the Boundary of East / Demo

Zone - II - Distribution System 10/1811150/WSS/WIN/087


Zone II - Anna Nagar SR - Zone A (Existing) 10/1811150/WSS/WIN/088


Zone II - Anna Nagar SR - Zone B (Existing) 10/1811150/WSS/WIN/089

90

WS Distribution System Layout Plan - East / Demo

Zone II - Annai Velankanni Nagar SR - Zone A

(Proposed)

10/1811150/WSS/WIN/090

91


Zone II - Annai Velankanni Nagar SR - Zone B

(Proposed)

10/1811150/WSS/WIN/091


Zone II - Bharathi Nagar SR - Zone A (Proposed)

10/1811150/WSS/WIN/092

Sheet 1 to 2


Zone II - Bharathi Nagar SR - Zone B (Proposed) 10/1811150/WSS/WIN/093


Zone II - DJ Nagar SR - Zone A (Existing) 10/1811150/WSS/WIN/094


Zone II - DJ Nagar SR - Zone B (Existing) 10/1811150/WSS/WIN/095



x



Zone II - GV Residency SR (Existing) 10/1811150/WSS/WIN/096


Zone II - Hudco Colony SR (Proposed) 10/1811150/WSS/WIN/097


Zone II - KK Nagar SR - Zone A (Existing) 10/1811150/WSS/WIN/098


Zone II - KK Nagar SR - Zone B (Existing) 10/1811150/WSS/WIN/099


Zone II - Kothari Nagar SR (Proposed) 10/1811150/WSS/WIN/100


Zone II - Nethajipuram SR - Zone A (Existing) 10/1811150/WSS/WIN/101


Zone II - Nethajipuram SR - Zone B (Existing) 10/1811150/WSS/WIN/102

103


Zone II - Rajalakshmi Nagar SR - Zone A

(Proposed)

10/1811150/WSS/WIN/103

104


Zone II - Rajalakshmi Nagar SR - Zone B

(Proposed)

10/1811150/WSS/WIN/104


Zone II - SIHS Colony SR (Existing) 10/1811150/WSS/WIN/105

106


Zone II - Sri Lakshmi Nagar SR - Zone A

(Proposed)

10/1811150/WSS/WIN/106

107


Zone II - Sri Lakshmi Nagar SR - Zone B

(Proposed)

10/1811150/WSS/WIN/107


Zone II - Tagore Nagar SR - Zone A (Proposed) 10/1811150/WSS/WIN/108


Zone II - Tagore Nagar SR - Zone B (Proposed) 10/1811150/WSS/WIN/109


Zone II - Uppilipalayam SR (Proposed) 10/1811150/WSS/WIN/110

111 Plan Showing the Boundary of West Zone -


112 WS Distribution System Layout Plan - West Zone -

AKS Nagar SR - Zone A (Proposed) 10/1811150/WSS/WIN/112


AKS Nagar SR - Zone B (Proposed) 10/1811150/WSS/WIN/113



xi



AKS Nagar SR - Zone C (Proposed) 10/1811150/WSS/WIN/114


Bharathi Park SR - Zone A (Proposed) 10/1811150/WSS/WIN/115


Bharathi Park SR - Zone B (Proposed) 10/1811150/WSS/WIN/116


Boopathy Layout SR - Zone A (Existing) 10/1811150/WSS/WIN/117


Boopathy Layout SR - Zone B (Existing) 10/1811150/WSS/WIN/118


Cheran Nagar SR (Existing) 10/1811150/WSS/WIN/119


Chinthamani Nagar SR - Zone A (Proposed) 10/1811150/WSS/WIN/120


Chinthamani Nagar SR - Zone B (Proposed) 10/1811150/WSS/WIN/121


DB Road SR - Zone A (Existing) 10/1811150/WSS/WIN/122


DB Road SR - Zone B (Existing) 10/1811150/WSS/WIN/123


Gandhi Park SR (Existing) 10/1811150/WSS/WIN/124


Housing Unit SR - Zone A (Proposed) 10/1811150/WSS/WIN/125


Housing Unit SR - Zone B (Proposed)

10/1811150/WSS/WIN/126

(sheet 1 to 2)


Iswarya Nagar SR - Zone A (Existing) 10/1811150/WSS/WIN/127


Iswarya Nagar SR - Zone B (Existing) 10/1811150/WSS/WIN/128


Jayaram Nagar SR - Zone A (Existing) 10/1811150/WSS/WIN/129


Jayaram Nagar SR - Zone B (Existing) 10/1811150/WSS/WIN/130


Koilmedu SR (Existing) 10/1811150/WSS/WIN/131


Kurunji Garden SR - Zone A (Proposed) 10/1811150/WSS/WIN/132


Kurunji Garden SR - Zone B (Proposed)

10/1811150/WSS/WIN/133

(sheet 1 to 2)

134 WS Distribution System Layout Plan - West Zone - 10/1811150/WSS/WIN/134



xii


Madathur SR (Existing)


RS Puram SR - Zone A (Existing) 10/1811150/WSS/WIN/135


RS Puram SR - Zone B (Existing)

10/1811150/WSS/WIN/136

(sheet 1 to 2)


Revathy Layout SR (Existing) 10/1811150/WSS/WIN/137


Sanganur Chinthamani SR (Existing) 10/1811150/WSS/WIN/138


Venkatapuram SR (Existing) 10/1811150/WSS/WIN/139

Standard Drawings

140 Typical Details of Pitless, Glandless Sluice Valves 10/1811150/WSS/WIN/140

141 Typical Details of Pitless, Glandless Scour Valves 10/1811150/WSS/WIN/141

142 Typical Details of Single Cylindrical Type -

Duojet Air Valves 10/1811150/WSS/WIN/142

143 Typical Details of Flow Control Valves with

Strainer Arrangement 10/1811150/WSS/WIN/143

144

Typical Details of Pressure Control Valves with

Bulk Water Meter and Data Logger for Flow &

Pressure Measurement

10/1811150/WSS/WIN/144

145 Typical Details of House Service Connection with

the Existing System 10/1811150/WSS/WIN/145

146 Typical Details of House Service Connection

without the Existing System 10/1811150/WSS/WIN/146

GA Drawings

147 General Arrangement Drawing of SR - 4 LL - 15m

Staging Height 10/1811150/WSS/WIN/147


Staging Height

10/1811150/WSS/WIN/148

(sheet 1 to 2)


Staging Height

10/1811150/WSS/WIN/149

(sheet 1 to 2)


Staging Height

10/1811150/WSS/WIN/150

(sheet 1 to 2)


Staging Height

10/1811150/WSS/WIN/151

(sheet 1 to 2)

152 General Arrangement Drawing of SR - 10 LL -

15m Staging Height

10/1811150/WSS/WIN/152

(sheet 1 to 2)


15m Staging Height

10/1811150/WSS/WIN/153

(sheet 1 to 2)



xiii



15m Staging Height 10/1811150/WSS/WIN/154



156 General Arrangement Drawing of SR -16 LL - 15m


157 General Arrangement Drawing of SR -18 LL - 12m










162 General Arrangement Drawing of Sump - 7 LL 10/1811150/WSS/WIN/162

163 General Arrangement Drawing of Sump -10 LL

(Type 1 to Type 2)-(2 sheets) 10/1811150/WSS/WIN/163

164 General Arrangement Drawing of Pump Room

(8M x 8m x 5M)-(2 sheets) 10/1811150/WSS/WIN/164

165 General Arrangement Drawing of Pump Room

(20M x 20M x 6M) 10/1811150/WSS/WIN/165

RCC Drawings

166 Reinforcement Details of SR - 4 LL - 15m Staging

Height - Type Design

10/1811150/WSS/WIN/166

(sheet 1 to 5)



10/1811150/WSS/WIN/167

(sheet 1 to 5)



10/1811150/WSS/WIN/168

(sheet 1 to 6)



10/1811150/WSS/WIN/169

(sheet 1 to 6)



10/1811150/WSS/WIN/170

(sheet 1 to 6)

171 Reinforcement Details of SR - 10 LL - 15m

Staging Height - Type Design

10/1811150/WSS/WIN/171

(sheet 1 to 6)



10/1811150/WSS/WIN/172

(sheet 1 to 8)



10/1811150/WSS/WIN/173

(sheet 1 to 7)



xiv




10/1811150/WSS/WIN/174

(sheet 1 to 7)



10/1811150/WSS/WIN/175

(sheet 1 to 8)



10/1811150/WSS/WIN/176

(sheet 1 to 8)



10/1811150/WSS/WIN/177

(sheet 1 to 8)



10/1811150/WSS/WIN/178

(sheet 1 to 8)



10/1811150/WSS/WIN/179

(sheet 1 to 8)



10/1811150/WSS/WIN/180

(sheet 1 to 8)

181 Reinforcement Details of Sump - 7 LL - Type

Design

10/1811150/WSS/WIN/181

(sheet 1 to 2)

182 Reinforcement Details of Sump - 10 LL - Type

Design 10/1811150/WSS/WIN/182

183 Reinforcement Details of Pump Room - 8m x 8m x

5m - Type Design 10/1811150/WSS/WIN/183

184 Reinforcement Details of Pump Room - 20m x

10m x 6m - Type Design 10/1811150/WSS/WIN/184



xv

LIST OF TABLES

Table No. 1 – Population Projection (Geometric Incremental Method) 23

Table No. 2 - Details of Water Demand for Intermediate Stage (2029) 24

Table No. 3 - Details of Water Demand for Ultimate Stage (2044) 24

Table No. 1.1 - Details of Water Supply Zones 31

Table No. 1.2 - Details of Service Reservoirs & Sumps 31

Table No. 1.3 – Existing Water Supply Scenario 34

Table No. 1.4 - Length of PVC Pipes in Existing System 37

Table No. 1.5 - Length of CI Pipes in the Existing System 37

Table No. 1.6 - Length of AC Pipes in the Existing System 38

Table No. 1.7 - Length of PSC Pipes in the Existing System 38

Table No. 1.8 - Abstract on Length of Existing Pipes in Distribution System 39

Table No. 1.9 - Quantity of TDS level measured in Ground water 41

Table No. 1.10 - Overall DCB Statement for CCC for the Past 5 years 41

Table No. 1.11 - Details of Existing Sewerage Service & Connection Charges 42

Table No. 1.12 - Existing water tariff 44

Table No. 2.1 - Inflow into Pillur Dam Reservoir (1966 – 2008) 48

Table No. 2.2 - Pillur Dam Source Realiability Analysis 49

Table No. 2.3 - Project Benchmarks 52

Table No. 2.4 – Hydraulic Design Parameters 62

Table No. 2.5 - Projected Population under Geometric Incremental Method 63

Table No. 2.6 – Ward Wise Population Density 64

Table No. 2.7 - Summary of Density Pattern 66

Table No. 2.8 – Population Projection Factor 66

Table No. 2.9 - Ward Wise Population Projection 68



xvi

Table No. 2.10 - Ward Wise Demand Calculation 77

Table No. 2.11 – SBC Test on Proposed SR Site (One SR / Zone) 81

Table No. 2.12 – Soil Trial Pit at Thanner Pandal Road 82

Table No. 2.13 – Soil Trial Pit at Nava India Road 82

Table No. 2.14 – Soil Trial Pit at Avarampalayam 83

Table No. 2.15 – Number of House Service Connections (Base Year 2014) 88

Table No. 2.16 - Additional Data Collection Made 88

Table No. 2.17 - Water Sampling and Testing 89

Table No. 2.18 - Water Sampling and Testing 90

Table No. 2.19 - “C” Value used for Hydraulic Design 92

Table No. 2.20 - Pipe Sizes Proposed in Feeder Mains 92

Table No. 2.21 – Existing Feeder Mains under Pillur System 93

Table No. 2.22 – Existing Feeder Mains under Siruvani System 94

Table No. 2.23 - Pillur Feeder Main I 98

Table No. 2.24 - Pillur Feeder Main II 102

Table No. 2.25 - Pillur Feeder Main III 105

Table No. 2.26 - Pillur Feeder Main IV 106

Table No. 2.27 Siruvani Feeder Main I 107

Table No. 2.28 -Siruvani Feeder Main II 108

Table No. 2.29 - Siruvani Feeder Main - III 109

Table No. 2.30 - SRs by Direct Feeding before Siruvani MSR 111

Table No. 2.31 - Summary of flow in Feeder Mains 112

Table No. 2.32 - Sluice Valves in Feeder Main 113

Table No. 2.33 - Scour Valves in Feeder Mains 113

Table No. 2.34 - Air Valves in Feeder Mains 113



xvii

Table No. 2.35 – Flow Regulating Valves for Pillur System 114

Table No. 2.36 - Pumpset Duty (of Each Pumps) for Pillur and Siruvani System 116

Table No. 2.37 - Gravity Interlinking between Pillur MSR & Bharathi Park GLSR 118

Table No. 2.38 - Pumping from Bharathi Park GLSR to Bharathi Park MSR 118

Table No. 2.39 - Sluice Valves in Feeder Main 118

Table No. 2.40 - Scour Valves in Feeder Main 118

Table No. 2.41 - Air Valves in Feeder Main 119

Table No. 2.42 - Pipe Sizes Proposed in Distribution System 121

Table No. 2.43 – Proposed HDPE Pipe Sizes in Distribution System 122

Table No. 2.44 – Proposed DI K7 Pipe Sizes in Distribution System 127

Table No. 2.45 – Retained CI Pipes suitable for Hydraulic Design in Distribution System 132

Table No. 2.46 – Total Pipe Length in Distribution System (Including retained pipe) 135

Table No. 2.47 – Details of Service Reservoirs 140

Table No. 2.48 – Details of SR & Distribution System Demand 144

Table No. 2.49 – Proposed Distribution System Demand or Rezoned Demand 148

Table No. 2.50 – Details of SR with Ward Numbers Covered 149

Table No. 2.51 – Proposed Service Reservoir Capacity 152

Table No. 2.52 – Details of SR with Reserved Site 152

Table No. 2.53 - Details of the Old and Abandoned SRs 157

Table No. 2.54 - Sluice Valves in Distribution System 157

Table No. 2.55 - Scour Valves in Distribution System 158

Table No. 2.56 - AirValves in Distribution System 158



xviii

LIST OF FIGURES

Fig. No. 1 - Siruvani Dam – Downstream View 27

Fig. No. 2 - Pillur Dam – Downstream View 28

Fig. No. 3 - Pillur Dam 28

Fig. No. 4 - Raw Water Intake Well at Pillur Reservoir 29

Fig. No. 5 - Gandhi Park SR 30

Fig. No. 6 - Ramakrishnapuram MSR 31

Fig. No. 7 - Siruvani Dam 47

Fig. No. 8 - Pillur Dam 47

Fig. No. 10 - Walk by Meter Reading 61

Fig. No. 9 - Mobile Meter Reader 60

Fig. No. 11 - Density Pattern of Wards in Coimbatore 67

Fig. No. 12 - Ward Wise Population Projection (From 1 to 20 - Old Ward Numbers) 73

Fig. No. 13 - Ward Wise Population Projection (From 21 to 40 – Old Ward Numbers) 74

Fig. No. 14- Ward Wise Population Projection (From 41 to 60 – Old Ward Numbers) 75

Fig. No. 15 - Ward Wise Population Projection (From 61 to 72 – Old Ward Numbers) 76



19

List of Abbreviation and Acronyms

BIS Bureau of Indian Standards

BLT Build Lease and Transfer

BOLT Build Operate Lease and Transfer

BOO Build Own and Operate

CCC Coimbatote City Corporation

CDP Comprehensive Development Plan

CI Cast Iron

CPHEEO Central Public Health & Environmental Engineering Organisation

CSMC Central Sanctioning and Monitoring Committee

Cu m Cubic Metre

DBFO Design Build Finance and Operate

DI Ductile Iron

DPR Detailed Project Report

EIRR Economic Internal Rate of Return

SR Service Reservoir

EOI Expression of Interest

EPC Engineering Procurement and Construction

GIS Geographical Information System

GLSR Ground Level Service Reservoir

GO Government Order

GPS Geographical Positioning System

GTS Great Trigonometric Survey

HDPE High Density Poly Ethylene



20

List of Abbreviation and Acronyms

HSC House Service Connection

HT High Tension

IRR Internal Rate of Return

JNNURM Jawarharlal Nehru National Urban Renewal Mission

KL Kilo litre (1000 litre)

lpcd Litres Per Capita Per Day

LT Low Tension

M&E Monitoring and Evaluation

ML Million Litre

MLD Million Litre per Day

MSL Mean Sea Level

O&M Operation and Maintenance

PF Public Fountain

PPP Public Private Partnership

PVC Poly Vinyl Chloride

RFP Request For Proposal

RFQ Request for Qualification

SOR Schedule of Rates

TOR Terms Of Reference

UFW Unaccounted for Water

ULB Urban Local Body



21

PROJECT SUMMARY

Preamble

As a part of the Jawaharlal Nehru National Urban Renewal Mission (JNNURM) initiated by Government

of India, Ministry of Urban Development and Ministry of Housing and Urban Poverty Alleviation, 63 cities

have been selected all over India. The aim of the mission is to encourage various cities to initiate steps to

bring about improvement in the existing service levels in an efficient, equitable and financially sustainable

manner. Water Supply has been identified as one of the major sector eligible for assistance under the

submission directorate for Basic Services to the Urban Poor. Coimbatore is one of the selected cities under

this mission.

Background

Coimbatore City Corporation is located in the western part of Tamilnadu and is the third largest city in

Tamilnadu after Chennai and Madurai and one of the fastest growing cities in India. This city serves as the

District Headquarters for Coimbatore District and is situated at 495 kms South West of Chennai City in

Tamilnadu. It is well connected with major cities and towns of India by Highways, Railways and Airways

and also abroad. Coimbatore City is a major industrial and textile centre and is now emerging as a major

hub for Information Technology in Tamilnadu. Many National and Multinational companies are planning to

start their software parks in Coimbatore. Thereby, job opportunities and population are expected to increase

in multifold. There are more than one lakh small, medium and large scale industries of Textile, Automobile

spares, Foundry, Pumps, Motors, Electronics, Steel and Aluminium are existing. Coimbatore City is

popularly known as the Textile Capital or Manchester of South India.

The Commissioner of City Corporation, Coimbatore had invited proposal for the preparation of Detailed

Project Report for Improving and revamping the Existing/Proposed Water Supply Scheme with 24x7 in

Coimbatore Municipal Corporation. The LOI was issued to M/s Fichtner India vide ROC No.

29760/2006/WSI dated 8.09.2008 by the Commissioner of Municipal Corporation, Coimbatore. The first

stage of this assignment, the Inception Report was submitted to the Coimbatore Corporation during

November 2008 followed by Interim report during March 2009, Draft Final Report during July 2009 and



22

the final DPR was submitted during March 2010 in accordance with the suggestions of the State Level

Technical Standing Committee constituted by Directorate of Municipal Adminsitration, Government of

Tamilnadu, Chennai, City Technical Advisory Group (CTAG) / City Voluntary Technical Committee

(CVTV), Elected Representatives of Coimbatore Corporation. Further to the submission of the DPR, M/s

Fichtner India has revised the DPR as per Minutes of Principal Secretary, MA&WS as requested by

Coimbatore corporation vide corporation letter Roc.No.2896/08/JN-5 dated 16.12.2011.In addition to the

above, the Technical suggestions received from TNUIFSL, Chennai has been incorporated and submitted as

requested by the Coimbatore corporation vide corporation letter Roc.No.2896/08/JN-5 dated 15.02.2012.

Subsequently, M/s Fichtner India has made a power point presentation to Commissioner, Coimbatore

Corporation and further to Commissionarate of Municipal Adminsitration, Chennai, Government of

Tamilnadu along with special invitee of Water Supply and Sanitation Specialist of World Bank for onward

forwarding of the DPR to the State Level Nodal Agency as requested by the Coimbatore Corporation vide

corporation letter Roc.No.2896/08/JN-5 dated 07.02.2013. The Technical suggestions received from CMA,

Chennai has also been incorporated and submitted as Revision Number I of the DPR. The same DPR has

been appraised to SLTSC (State Level Technical Steering Committee of Tamil Nadu). The appraised DPR

has been forwarded to Ministry of Urban Development, Government of India through Tamil Nadu Nodal

agency, TUFIDCO for funding under JNNURM – II Section via official letter

no.TUFIDCO/JnNURM/GoTN/M(Mu)/501/2013 dated 23.08.2013. The same DPR has been technically

appraised by CPHEEO, MoUD, GOI and their suggestions and commnets has been incorporated and

submitted herewith as final DPR.

Project Site Appreciation & Rationale for Water Supply Improvements

The population has grown from 0.47 lakhs in 1911 to 9.30 lakhs in the year 2001 with an average annual

growth rate of 2.7 % and an average decadal growth rate of 27.34%. The population of the Local Planning

Authority is 16.40 lakhs covering an area of 105.60 Sq.km. The availability of power, clubbed with raw

material availability for textile processing, from 1935, has led to the establishment of many industries

resulted in a nearly 52% increase in population during 1941-1951. The city has registered the decadal

growth rate of 49.20 % during the period 1971- 1981. This is attributed to the up gradation of Municipality

to the status of Corporation, whereby additional areas were included in its jurisdiction.The geographical

location details of Coimbatore Corporation as per Survey of India topographical map are Latitude: 10o

58’00” N & Longitude: 76o 58’ 00”E. The present water supply to Coimbatore Corporation is 137 mld for

a population of 1.10 million at the pro rata supply of 125 lpcd, from two water supply schemes, namely,



23

Siruvani & Pillur.

a) Siruvani Water Supply System: At present, 75 Mld of treated drinking water from the existing

Siruvani Water Supply Scheme is being supplied to the Coimbatore Corporation with head works

(Siruvani Reservoir) at Attapady Valley in Palakkad District of Kerala State, at a distance of 40 km

from Coimbatore. The raw water is conveyed through a tunnel to the treatment plant at Siruvani

Adivaram. After full scale treatment, clear water is conveyed by gravity through 1000 mm PSC pipes

to the Master Service Reservoir at Bharathi Park from where it is fed to the Service Reservoirs in

Western Zone of the town and distributed through the network of distribution system. The scheme is in

operation since 1982.

b) Pillur Water Supply System: Another scheme with the Pillur Reservoir situated at the foothills of

Nilgiris in Western Ghats as source was implemented in the year 1995 for Coimbatore Corporation, 22

Towns and 523 Rural Habitations. The total installed capacity is 125 Mld and Coimbatore corporation

gets 62 Mld from this scheme. Raw water is drawn through intake well cum pump house located in

Pillur Reservoir and conveyed through 1500 mm dia. MS pipes and tunnel of length 3.850 km at

Periakombai hills to the treatment plant at Velliangadu. The treated water is pumped from WTP

through the clear water tunnel of 0.9 Km long at Kattan hills. The water is gravitated from the tunnel

to the Master Service Reservoir at Ramakrishnapuram from where it is fed to the Service Reservoirs in

Eastern Zone of the town and distributed through the network of distribution system. The requirements

of other beneficiaries are tapped at suitable locations.

Population and Demand Forecast

Population projection is done as per Geometric Incremental Method as this method is mostly applicable for

growing towns and cities having vast scope of expansion as described in CPHEEO, under Clause 2.2.7 on

Population Projection. The same method has also been approved or followed under JNNURM Project for

Pillur II Scheme, which is the Terms of Reference for this project.

Table No. 1 – Population Projection (Geometric Incremental Method)

Sl No Year Project Stage Population (Nos)

1 2011 Census Population 10,61,447

2 2014 Base Year 11,10,933

3 2029 Intermediate Stage 13,95,199

4 2044 Ultimate Stage 17,52,203



24

The base year for the proposed scheme is taken as 2014 (as requested by the Corporation vide corporation

letter Roc.No.2896/08/JN-5 dated 15.02.2012) with the 2011 Census population as basis for population

projection. The details of water demand for the intermediate and ultimate stage are given in Table No.2 and

Table No.3 below,

Table No. 2 - Details of Water Demand for Intermediate Stage (2029)

Sl.No. Description Requirement

1 Intermediate population in the year 2029 (Nos) 13,95,199

2 Demand at 135 lpcd (Mld) 188.352

3 Demand including losses @ 15% (Mld) 216.605

4 Industrial and Commercial demand (Mld) 9.978

Sub Total (Mld) 226.583

5 Deduct supply from existing Siruvani scheme (Mld) 75.000

Balance Requirement (Mld) 151.583, Say 152

Table No. 3 - Details of Water Demand for Ultimate Stage (2044)

Sl.No. Description Requirement

1 Ultimate population in the year 2044 (Nos) 17,52,203

2 Demand at 135 lpcd (Mld) 236.547

3 Demand including losses @ 15% (Mld) 272.030

4 Industrial and Commercial demand (Mld) 17.250

Sub Total (Mld) 289.280

5 Deduct supply from existing Siruvani scheme (Mld) 75.000

Balance Requirement (Mld) 214.28, Say 215

Strategy for Water Supply Improvements

In order to meet the requisite water demand in the intermediate stage in 2029 and in the ultimate stage in

2044, improvements to water supply in Coimbatore is classified as follows:

(a) Restructuring of existing water supply system comprising of replacement of all existing and old

distribution PVC pipelines with solution joints not suitable for both the hydraulic design and pressure

requirements, in both Pillur & Siruvani distribution systems.

(b) Restructuring of Siruvani water supply system to 75 Mld for both Intermediate and Ultimate

requirement, since it is an interstate source and possibility of tapping additional quantity is remote.



25

(c) Augmentation of water supply from Pillur reservoir to meet the balance ultimate demand of 214.280

Mld for the entire corporation.

(d) Augmentation of additional Storate tanks for the intermediate demand.

(e) Provision of special components / control and instrumentaions for a pressured continous water supply

system from the present intermittent supply.

Cost of the Project

The total cost of the project is estimated as Rs556.57 Crores (As per Schedule of Rates 2016–2017)

1 Sector Background, Context & Broad Project Rationale

1.1 Project Site Appreciation

Coimbatore is the district head - quarters of Coimbatore district located at 495 Km south west of Chennai.

This is the third largest city in Tamilnadu and has numerous textile mills and small scale engineering units.

Historical reference of Coimbatore city dates back to 1200 AD. Ruled by Cheran rulers, the city was

developed as strategic town during the Nayakas rule of Madurai. Tippu Sultan conceded the town to British

colonialists in 1799, who subsequently promoted Coimbatore as the military transit town between Palghat

in the west and Gazal Hatty in the north. Beginning 1879, the city has started to emerge as an administrative

and industrial town in its own merit. In the year 1866, Coimbatore was constituted as a Coimbatore

Municipal Town with an area of 10.88 sq. km. The Madras- Podanur rail link passing through Erode was

opened in the same year and thus its connectivity to the other region was improved. The Coimbatore

Municipality was upgraded to Municipal Corporation during May 1981 and spreads over an area of 105.60

sq. km.

1.1.1 Physical & Geographical Characteristics

The city is traversed, in the middle, by the river Noyyal rising from the Vellingiri hills on the West. It is

surrounded by the Nilgiris, a rich tea producing hinterland in the North, Pollachi, the receiving center for

forest production in the South and the Cochin Harbor in the South West. The towns of Mettupalayam,

Pollachi and Tirupur are within a radius of 40 Km. from Coimbatore. The Regional setting of Coimbatore

is explicated in Dwg No: 10/1811150/WSS/WIN/001, Volume VI part of this DPR.



26

1.1.2 Topography

Coimbatore Corporation is having a gradual slope from the West to East and north to south except some

pockets like Race Course and Ram Nagar. The ground level varies generally from + 440.00 to + 390.00 mm

from MSL.

1.1.3 Geology

The area is underlined by high grade of metamorphic rock of peninsular gneissic complex. These rocks are

moderately weathered. The major rock types occurring in the area are Biotitic gneiss and Charnockite. The

permeability rate varies from medium to poor, depending upon the soil texture. It was reported that the

over-exploitation of ground water has caused heavy decline in ground water level in the Corporation area.

1.1.4 Soil

The soil in most of the areas is black cotton soil.

1.1.5 Structure & Tectonics

The crystalline rocks of Achaean Age are the primary rocks which have undergone varied degree of

metamorphism, exhibit secondary structural features like joints and fractures or lineaments.

1.1.6 Weathering

The crystalline rocks of the Coimbatore area are highly variable depending upon the structure, mineral and

chemical composition of the rocks. Gneiss in general is less resistant to weathering than charnockite and

granite due to highly foliated and fissile nature. The average depth of weathering in this block is 15 m and

the maximum is about 30 m from G.L.

1.1.7 Alluvium & Kankar

Occurrences of alluvium are seen whereas extensive surface cover of Kankar is noticed. Kankar, which is a

product of chemical weathering of the country rocks, is a hard, indurated, white to buff coloured material

composed of calcium carbonate. Precipitation is the main source of recharge. There are no perennial rivers

or noticeable canal command system to promote recharging.

1.1.8 Climate and Rainfall

The mean daily temperature during summer varies from 36° C to 41° C and during winter varies from 14° C



27

Fig. No. 1 - Siruvani Dam – Downstream

View

to 31°C. The influence of the western ghat is predominant in this region. The area receives rainfall mainly

from North East monsoon and the contribution from South west is marginal. The average annual rainfall of

Coimbatore city is 623 mm where as it is 714.00 mm for Coimbatore district.

1.1.9 Industrial Activities

There are a number of textile mills in and around the city run by Government and by private companies.

Well established handloom textile manufacturing units, big and small foundries engaged in the

manufacturing of deep well motors and pump sets for agricultural and domestic purposes, a famous cement

manufacturing unit in Madukkarai at 10 kms from the city and 3 big textile machinery manufacturing units,

etc provide employment to thousands of people and contribute to the industrial growth of the region and the

state. Coimbatore has also attracted investment in hi-tech industries in the recent years, especially in the

field of solar energy and computer software.

1.1.10 Existing Status of Physical Infrastructure

(i) Status of Water Supply Infrastructure

The City Engineer and his team of Engineers and Staff are

responsible for ensuring protected drinking water supply in

the city. The city requires 165 Million litres of water daily

at present. On an average, the per capita supply is

maintained at about 125 lpcd (litres per capita per day) by

supplying 137 Mld.

Protected water supply for Coimbatore town is provided

through two major water supply schemes.

1. Siruvani Water Supply Scheme - 75 Mld

2. Pillur Water Supply Scheme I - 62 Mld

Total present supply - 137 Mld



28

Fig. No. 2 - Pillur Dam – Downstream

View

The head works of both water supply schemes are operated

and maintained by Tamil Nadu Water Supply and Drainage

Board and they supply bulk water to two different Master

Service Reservoirs maintained by Coimbatore Corporation.

From these two separate Master Service Reservoirs, water

supply is being distributed through 49 elevated service

reservoirs and sumps about 640 km of existing distribution

network.

The water level of Siruvani dam touched the dead storage level during 2004 due to monsoon failure and the

supply level was reduced to 25 Mld against normal supply of 75 Mld. As a temporary solution the needs of

the Siruvani fed area is met with by interconnecting Pillur water supply and Siruvani water supply networks

wherever possible.

Services / Functions

Operation and Maintenance of headworks for water supply and distribution of drinking water to

house holds and public fountains.

Sanctioning new house service connections

Conveyance and distribution of water for private and public uses

Billing and collection of water charges

Creating awareness among people to conserve water and construct Rain Water Harvesting

structures

(ii) Source - Pillur (Bhavani River) source

Pillur Dam was constructed in Bhavani River, a tributary

of Cauvery. The Dam is located in the downstream of the

confluence point of its main tributary Kundha River

which originates in the Nilgiris hills of Western Ghats.

The average rainfall of the basin is ranging from 1000

mm to 4000 mm. The catchment of the river lies in both

Fig. No. 3 - Pillur Dam



29

Tamil Nadu and Kerala states and forms part of the Western Ghats.

There are three hydel power projects in the upstream of

Pillur Dam. The major tributaries are Siruvani, Kodingiyar

& Varahapallam Rivers. Kunda River is confluencing in

river Bhavani in the upstream of Pillur Dam. The total

storage capacity of Pillur Dam is 1566 Mcft and FRL is

426.72 m and Dead Storage level is 356.60 m. The

minimum inflow into the Dam is 600 cusecs. About 53.65

cusecs (131.25 Mld) is already tapped for Pillur Scheme I.

Hence another 53.65 cusecs (131.25 Mld) of water may be

safely tapped from the Dam for Pillur Scheme II.

Existing Pillur Scheme I - Salient details

Source : Pillur Reservoir across River Bhavani.

Head works : Collection well - 21 m dia

Raw water pumpsets : 6 x 442 HP (2 Nos. standbye) Vertical

Turbine pumpsets of duty

91200 lpm x 61.99 m

Raw water pumping main : 1500 mm dia MS pipe - 482 m

Raw water Tunnel

at Periyakombai Hill : 3850 m long, 2.20 m size D’ shaped tunnel

Raw water Gravity main : 1500 mm dia PSC pipe 1050 m

Water Treatment Plant at Velliyankadu: 131.25 mld consists of pre-sedimentation

Tank, Aerator, Clariflocculator, Filter house,

Clear water reservoir and Sump-cum-pump

house etc.

Fig. No. 4 - Raw Water Intake Well at

Pillur Reservoir



30

Clear water pumping main : 1500 mm dia PSC / MS pipe - 10870 m

Clear water tunnel at Katten Hill : 800 m long, 2.20 m size D’ shaped tunnel

Clear water Gravity main upto MSR : 1500 & 1000 mm dia PSC pipe - 23700 m

Master Service Reservoir (MSR)

at Ramakrishnapuram : 30 Lakh litres

Feeder mains : 43 km

Service Reservoirs & Sumps : 23 Nos.

(iii) Source - Siruvani River Source

Source : Siruvani Dam

Head works at Attapady valley

in Palghat district,Kerala : Intake tower 6 m dia

Raw water Tunnel : 1550 m length, 1.80 x 2.10 m

Pick up weir & Raw water Gravity main : The water from the dam let out in the

Anayar stream at tunnel exit is picked up at

Adivaram by a pick up weir, after its travel

through a length of 1.6 km in the Anayar stream.

The water heading up at the pick up weir is let

into a Collection well and conveyed to the

Treatment works through 1000 mm dia PSC

pipes.

Treatment Plant at Siruvani Dam

Adivaram : 106.50 mld consists of Aerator,

Clariflocculator, Filter house and

Clear water reservoir

Clear water Gravity main upto MSR : 1000 mm dia PSC pipe 31330 m

Master Service Reservoir at Bharathi Park : 38.00 Lakh litres

Service Reservoirs & Sumps : 26

Nos.

(iv) Present Water Distribution Zones

Initially there were 25 service reservoirs (226.39 LL) in the city.



31

After commissioning of Pillur Scheme-I, the city is served by 46 service reservoirs. Further 3 SRs located at

Vysial Street under Siruvani Scheme & Rathinapuri and Maniakarampalayam under Pillur Scheme-I are not

in use. The balance service reservoirs of 236.50 LL capacities get water from Pillur Source. The total area

has been divided into 5 water supply zones and 43 sub-zones for effective operation and maintenance.

Details of existing five water distribution zones are given in Table No. 1.1

Table No. 1.1 - Details of Water Supply Zones

Zone No. Zone

No. of

SRs &

Sump

Population Base

year (2006) No. of HSC Source

I HLR-Bharathi Park 11 164064 18429 Siruvani

II LLR-Gandhi Park 10 254706 21387 Siruvani

III MSR-

Ramakrishnapuram

13 169592 22467 Pillur & Siruvani

IV Singanallur 10 226756 26456 Pillur

V Sungam 5 210157 17382 Pillur & Siruvani

Total 49 1025275 106121

(v) Master Service Reservoirs

Water is supplied to the city through the Master Service

Reservoirs at Barathi Park & Ramakrishnapuram. These

two master service reservoirs are supplying water to other

service reservoirs. These two MSRs also supply water to

their command area. The MSR at Ramakrishnapuram is

fed by the gravity main from clear water tunnel at Katten

hill under Pillur Scheme I. The MSR at Bharathi Park is

fed by the gravity main of Siruvani Scheme.

(vi) Service Reservoirs

Table No. 1.2 - Details of Service Reservoirs & Sumps

Sl. No. Zone Location of SR No. Capacity

(LL) GL (m)

LWL

(m)

MWL

(m) Source

1 I Dewan Baghadur Road 1 28.00 426.80 440.80 445.00 S I R U V A N I

Fig. No. 6 - Ramakrishnapuram MSR



32


(LL) GL (m)

LWL

(m)

MWL

(m) Source

2 Koilmedu 1 2.00 440.00 453.00 456.00

3 Nataraj layout (Boopathy

layout) 1 20.00 439.00 452.10 456.70

4 Venkatapuram 1 2.00 440.00 453.00 456.00

5 Bharathi Park MSR 5 38.87 432.00 443.00 447.00

6 Chinthamani Nagar

(Sanganur Part A) 1 5.00 439.00 450.00 453.00

7 Tatabad 1 11.00 426.00 434.80 438.00

8

II

Gandhi Park OHT 2 19.80 427.75 424.30 421.25

SIR

UV

AN

I

9 Gandhi Park 2 22.72 427.75 434.95 431.30

10 D.B.Road Near 3 Post 1 20.00 427.75 434.95 431.30

11 Jeyaram Nagar 1 10.00 414.00 431.44 428.44

12 Madathur (P.N.Pudur) 1 5.00 439.00 446.00 443.00

13 Iswarya Nagar

(Seeranaicken Palayam) 1 10.00 424.00 434.43 440.43

14 Revathi Nagar (Linamar) 1 3.00 422.70 434.00 431.00

15 Vysial Street 1 9.00 409.00 422.60 426.80

16

III

Jai Nagar,

Goundampalayam 1 10.00 427.43 451.14 455.14

SIR

UV

AN

I

17 R.G.Nagar (Kannappa

Nagar) 1 6.00 438.29 432.14 465.14

18 Kamarajapuram 1 6.00 426.74 429.50 432.50

19 Rathinapuri (Not in use) 1 6.00 426.00 432.00 435.00

PIL

LU

R

20 Ramakrishnapuram

(Ganapathy MSR) 1 30.00 428.86 443.86 447.86

21 Ganapathy Ma Nagar

(7.00-Sump) 1 3.00 428.86 443.86 446.50

22 TNUDP Colony Gandhi

Ma Nagar (11.00-Sump) 1 6.00 428.86 443.86 446.50

23 Krishnarayapuram Zone I

Avarampalayam 1 2.50 409.22 424.63 427.63

24 Krishnarayapuram Zone II

Kamadenu Nagar 1 3.00 409.49 422.44 425.44



33


(LL) GL (m)

LWL

(m)

MWL

(m) Source

25 Rayappa Nagar 1 15.00 423.63 434.07 437.07

26 Maniakarampalayam Zone-

I (Not in use) 1 1.00 410.00 416.00 419.00

27 V V Nagar 1 0.50 429.00 435.00 439.00

28 Police Quarters 1 0.50 429.00 435.00 439.00

29

IV

Peelamedu Zone I 1 15.00 414.50 425.50 429.00

PIL

LU

R

30

Peelamedu Zone II

Uppilipalayam Zone III

Part D.J.Nagar

1 10.00 406.29 420.29 423.79

31 Karunanidhi Nagar

(2 tier) 1

4.00 397.66 410.66 412.66

6.00 397.66 417.66 420.66

32

Sowripalayam Zone I

Udayampalayam (Meena

Estate)

1 5.00 401.00 409.00 412.58

33 Sowripalayam Zone II G.V

Residency 1 6.00 394.65 409.65 412.65

34 Uppilipalayam Zone I

VRP 1 10.00 403.00 411.00 414.11

35 Anna Nagar

Neelikonampalayam 1 16.00 389.11 404.11 407.61

36 Singanallur 1 7.00 396.00 398.00 401.00

37 Nethaji puram 1 12.00 387.491 399.491 403.141

38 SIHS Colony (7.00-Sump) 1 3.00 400.00 412.00 415.65

39

V

District IV -B

Sidhapudur 1 20.00 423.50 429.10 433.30

PIL

LU

R

40 District IX -B

Puliakulam 1 24.00 405.00 415.80 420.00

41 District IX -A

Townhall 1 16.00 409.00 422.60 426.80

42 V.O.C Park 1 27.00 423.00 435.80 440.00

SIR

U

VA

NI



34


(LL) GL (m)

LWL

(m)

MWL

(m) Source

43 Nanjundapuram 1 2.00 390.80 403.80 407.00

Grand Total 49 478.89

(vii) Existing Water Distribution System

Table No. 1.3 – Existing Water Supply Scenario

S.No Description Details

1 City Coimbatore

2 Status Corporation

3 Area 105.6 Sq.Km

4 Topography Elevation varies from 390m to 440 m

5 Wards 72 (New) 60 (Old)

6 Water Supply Zones 5

7 SRs & Sumps 49 Nos (41 SR’s & 8 Sumps)

8 Distribution Pipes 1122 Km

9 HSCs 106121

10 Present Service Level Intermittent Supply - 125 Lpcd (As per ToR)

(Once in 2/3 days for 2 to 3 Hours)

11 Proposed Service Level 135 Lpcd

12 Population 11,10,933 (As per 2011 Census Population)

The total length of the existing distribution network in Coimbatore Corporation is around 1122 km. Size of

pipes in the distribution system ranges from 45 mm dia to 237.8mm dia PVC, 80 mm to 600 mm dia CI, 80

to 450 dia AC and 300 and 1000 mm dia PSC pipes. The length of PVC, CI, AC and PSC pipes in the

existing system is given in Table No. 1.4, Table No. 1.5, Table No. 1.6, Table No. 1.7 and Table No. 1.8

respectively.

Pipe networks are not laid for some stretches of roads within Corporation boundary. So, there are many

uncovered areas in the town and these areas are dependent on water supply through tankers. The total length

of roads not covered by existing water distribution system is about 253 km. The new distribution network



35

provided is 1377 km and along with rider mains (a secondary line of 100 mm Diameter proposed parallel to

primary mains on the same road to avoid direct tapping from primary mains for House Service

Connections).

In each zone, it is noticed that the allotted quantity for that specific zone is distributed to a significantly

higher number of water supply service connections than originally stipulated without requisite technical

assessment, resulting in low pressure conditions in most of the areas. This results in residents not receiving

sufficient quantity of water at minimum residual pressure even during normal season, when adequate

supply is distributed to the town. This is primarily due to the indiscriminate extension of pipelines that have

been originally designed to serve only a specified number of service connections and distribution zone. In

order to eliminate this problem, the entire system has been redesigned with new distribution network

covering the entire Corporation area.

The prevailing problems in the distribution network, ward wise was listed down by the Councillors and the

remedial nmeasures for the same was listed down and enclosed in Volume I (b), Annexure Number – A2,

part of this DPR.

37

Table No. 1.4 - Length of PVC Pipes in Existing System

S.NO ZONE PVC ID Size in mm

45 59.60 71 85.3 118.7 152 170.9 190.1 213.8 237.8 Total

1 North Zone 0 865 105685 0 114516 1912 0 0 0 0

Total Length of Pipes

2 South Zone 0 865 14949 18489 32065 0 4378 2040 558 0

3 West Zone 0 1556 43880 0 90557 802 594 1202 0 257

4 Demo Zone-1 0 0 4792 5183 6422 751 542 0 0 0

5 Demo Zone-2 0 0 21135 183423 77016 4121 0 0 0

TOTAL 0 3286 190440 207095 320575 7586 5513 3242 558 257 739 Km

NOTE : The PVC pipes are jointed using solvent cement.

Table No. 1.5 - Length of CI Pipes in the Existing System

NOTE : The CI pipes laid in 1976 under Siruvani project for 34 km and the balance 160 km CI pipes laid under Pillur project in 1998.

S.NO ZONE CI Pipe Size in mm

80 100 125 150 200 250 300 350 400 450 500 600 700 Total

1 North Zone 0 0 0 156 0 0 0 0 0 0 0 0 0


2 South Zone 4946 11143 7905 3223 1932 746 1788 0 158 0 0 0 0

3 West Zone 3688 14968 5023 2529 1017 1112 1982 315 0 2531 533 0 0

4 Demo Zone – I 16384 54060 2438 8638 4581 1501 3457 0 0 850 0 0 0

5 Demo Zone - II 21615 1129 0 1237 6298 857 3232 739 0 1179 29 0 100

TOTAL 46633 81300 15367 15783 13828 4216 10459 1054 158 4560 561 0 100 194 Km

38

Table No. 1.6 - Length of AC Pipes in the Existing System

S.NO ZONE AC Pipe Size in mm

80 100 125 150 200 250 300 350 400 450 Total

1 North Zone - 3317 3660 1534 6059 1970 1348 1643 - -


2 South Zone 9059 10127 2408 2764 2212 2386 - - -

3 West Zone 1759 7719 2571 5445 4429 1466 1221 - - -

4 Demo Zone – I - - - - - - - - - -

5 Demo Zone - II - - - - - - - - - -

TOTAL 15808 21163 8639 9743 12700 5822 2569 1643 - - 78 Km

NOTE : The AC pipes joints are observed to be with frequent leaks and burst in the system.

Table No. 1.7 - Length of PSC Pipes in the Existing System

S. NO ZONE PSC Pipe Size in mm

Total 1000 1100 1200

1 North Zone - - -


2 South Zone - - -

3 West Zone 62 - -

4 Demo Zone – I - - -

5 Demo Zone - II - 1374 3166

TOTAL 62 1374 3166 5 Km

39

Table No. 1.8 - Abstract on Length of Existing Pipes in Distribution System

S.No. Material Abstract Length (Km)

1 PVC 785

2 AC 166

3 CI 169

4 PSC 2

TOTAL 1122 Km



40

1.1.11 Seismicity

Coimbatore region is susceptible to earthquake among the various other natural hazards like cyclone,

drought, heat, epidemics, underground fire, fire accidents and floods. The entire area of Coimbatore is

reported to be prone to earthquake any time. The potential impact of such a hazard would be loss of

life, livestock and infrastructure. As per IS 1893 (Part 1): 2002, Criteria for Earthquake Resistant

Design of Structures, Coimbatore city lies in Zone-III. According to the Seismic Hazard Map of 2000

of BIS shown as below, Coimbatore lies in the moderate damage risk zone and in the earthquake

hazard area.

Thus, in view of the factors mentioned above and the possibility of damage, due for construction of

buildings, guidelines as per IS 1893 (Revised 2002) have to be adhered to. Further, hazard reduction

measures need to be adopted including creating awareness in the people regarding the hazard and

developing preparedness is of utmost importance.



41

1.1.12 Groundwater Quality and Quantity

The chemical quality of ground water in the district is generally influenced by recharge, draft and

nature of soils, irrigation practices etc.In order to study the chemical quality of ground water and

evaluate the suitability for drinking purposes, the water quality monitoring is being done in the bore

well at Coimbatore Corporation (Selvapuram and Ondipudur observation wells of TWAD

Board).High values of TDS are noticed which are more than permissible limit. The chemical

parameters observed at Coimbatore Corporation are given in Table No.1.9.

Table No. 1.9 - Quantity of TDS level measured in Ground water

Total Dissolved Solids

2004 2005 2006

Jan May Jan May Jan May

3990 4375 3640 4368 3934 3433

i Quality of water is generally not potable due to excess TDS recorded.

ii Tapping additional quantity of about 125 Mld in the crystalline metamorphic terrain like

Coimbatore area is not at all feasible as it will affect the entire aquifer system of the area.

iii Formulation of Water Supply Improvement Scheme for Coimbatore Corporation based on

the local ground water or surface water is not dependable both qualitatively and

quantitatively because of the over extraction of groundwater for Domestic, Agricultural

and Industrial purposes as well as deterioration of water quality in the years of summer

period.

iv Hence a sustainable and assured source of water from Pillur Dam is being implemented to

satisfy the increasing demand of drinking water, particularly in this area, where scarcity

of water is being experienced during the years of scanty and erratic rainfall.

1.1.13 Financial Status of the Local Body

Table No. 1.10 - Overall DCB Statement for CCC for the Past 5 years

DCB Statement 2004-2005 2005-2006 2006-2007 2007-2008 2008-2009

Demand 16,51,43,798 18,83,89,745 21,06,73,277 20,83,14,830 22,22,60,059

Collection 10,45,83,539 11,49,08,127 14,56,79,240 14,05,11,964 15,29,73,742

Balance 6,05,60,259 7,34,81,618 6,49,94,037 6,78,02,866 6,92,86,317

1.1.14 Sewerage Infrastructure

The City Engineer and his team of Engineers and staff are entrusted with the responsibility of

maintaining this service. The Coimbatore City Sewerage system has been divided into 6 zones. The



42

UGD system has been functioning in old developed areas from 1983 in zone 1 and 2 and from 1994 in

zone 3 to a total length of 52.30 km. Nearly 19000 Residential and Non residential buildings have

been provided with service connections. There are two pumping stations at Ukkadam and at

Nanjundapuram to pump sewage to the STP at Vellalore. Treated effluent is being used for

Horticulture and Golf ground maintenance purposes. The estimates for providing UGD in zones 4, 5

and 6 have been prepared. The Government has accorded Administration Sanction for the project and

the same is being under implementation.There are 19,897 house sewer connections. It is proposed to

extend underground drainage system to the added areas at a cost of Rs.250 Crores by identifying

funding agency for the project.

1.1.15 Sewage Farms

The Corporation has two sewage farms covering an extent of 815 acres: Ukkadam (115 acres) and

Vellalore (700 acres). The Corporation has undertaken an ambitious programme of tree plantation in

an area of about 150 acres in the Vellalore sewage farm with the help of the state forest department.

Around 55,000 saplings have already been planted. The details of the existing sewerage service and

connection charges are given in Table No. 1.11.

Table No. 1.11 - Details of Existing Sewerage Service & Connection Charges

Based on

Property tax

Avg. annual sewerage service

charges for new & existing

connections

One time sewerage connection

charges at the time of new

connections

Domestic (Rs) Commercial (Rs) Domestic (Rs) Commercial (Rs)

Upto Rs.300 200 500 1250 2400

Rs.300 - 1000 1450 3200 4500 10000

Rs.1000-5000 4700 8500 9000 17500

Above Rs.5000 7750 16500 14500 24000

Source: UGSS Report for Coimbatore City

1.1.16 Storm Water Drains

The Corporation maintains 603.50 kms of storm water drains. About 40 kms of new storm water

drains are being constructed and added every year. At present, there is a full fledged storm water

drainage facility in most part of the Corporation. The storm water finds its way towards the nearby

Sanganur Pallam Odai and ultimately joins with the Noyyal River at Singanallur area. Besides, during

the heavy rainfall time and frequent flash flood situations in the corporation area, the storm water



43

system should be capable of quick disposal of the rain water and also it should prevent any damage to

life, properties, business and transportation etc. The sullage and part of sewage are collected through

the storm water drains and finally finds its way towards the nearby Noyyal River through its canal

system.

1.1.17 Solid Waste Management

Solid waste management in the city is entrusted with the Health Department and Engineering

Department. The aim of the City Municipal Corporation is 100% collection of garbage generated in

the city daily. The area of the city is 105.60 Sq.km. This is divided in to 72 wards (Old) and 60

wards (New). The entire streets in the above 72 wards (Old) are put into blocks for the purpose of

sweeping. Waste generated in the city is about 500 tonnes per day.

The waste generated is swept and collected in 700 dustbins and 201 containers which are distributed

in various street corners and dumper boxes. 2457 Sanitary Workers are employed by this Corporation.

The collected garbage is transported to dust bins by hand-drawn push carts.All the streets in 72 wards

(Old) are divided in day blocks and there are 2457 scavengers in this Corporation. All the garbage

collected is removed through tractors engaged on hire by the Corporation to the compost yard at

Vellalore.

1.1.18 E-Governance

In this Corporation, data relating to property tax, water charges and non-tax items have been

computerized and are collected through computerised service centres / selected banks. Computerised

Service Centres are functioning on all working days from 10.00 A.M. to 5.P.M. so as to enable the

public to remit the tax directly. Public can ascertain the details of property tax dues etc., from the

Computerised service centres during the working hours. Birth and death certificates are issued

through computer service centres and there is also facility to register the complaints of the public

through phone.

1.1.19 Web site

Public can get general information of the Corporation.

Public can have the details of all activities of Corporation through the WEBSITE.

WEBSITE: www.coimbatore-corporation.com

E-Mail ID : [email protected]

mailto:[email protected]



44

1.2 Existing Tariff and Cost Recovery

The levy of water charges is under stepped tariff system from 01.04.2003. The corporation is

collecting the following service connection charges. The existing water tariff is detailed in Table

No.1.12. New Water Supply connection charge is Rs.2000.

Table No. 1.12 - Existing water tariff

Rs. per 1000 litres/month Domestic (Rs.) Non-domestic (Rs.)

Upto 50,000 3.50 7.00

50,001 to 100,000 4.00 9.00

100,001 to 150,000 5.00 12.00

Above 150,000 6.50 15.00

METERED CONNECTIONS

S.No Consumption (m3) Domestic Non Domestic Bulk Domestic Bulk Non domestic

1 1 - 50 m3 3.50 7.00 3.50 7.00

2 50 - 100 4.00 9.00 4.00 9.00

3 100 - 150 5.00 12.00 5.00 12.00

4 Above 150 6.50 15.00 6.50 15.00

5 Bi-Monthly

Minimum 80.00 600.00 350.00 900.00

Domestic users are allowed a free allowance of 100 litres per day

Supply on a per tap basis is allowed at Rs. 50.00 per tap connection per month

Note :

1. All connections are metered and consumers are billed every 2 months

2. Water bills are paid at the water utility office at banks, through bill collectors and at CCMC

3. There were 3240 new connections in 2005-06. The price of a new domestic connection is

Rs.3000 payable prior to connection



45

2 Project Definition, Concept and Scope

2.1 Project Area

The project area is the Coimbatore City Corporation area, having 72 wards (Old) , covering

105.6 sq km area.

2.2 Scope of Work

Preparation of DPR

Part I

(i) For improving and revamping the existing water supply distribution net work with

assured storage facilities for uninterrupted 24 X 7 water supply facility to the entire

Corporation area

Part II

(ii) For design, operation, maintenance of uninterrupted 24 X 7 water supply facility to

demo zones I & II in Coimbatore Corporation

Part III

(i) Design of TwoTunnels having capacity of 265 Mld for Raw Water and 250 Mld for

Clear Water

(Aready submitted separately to Coimbatore Corporation vide FI/letter no

3350810001/018 dated 25/01/10)

2.3 Objectives

2.3.1 Objective: A

Objectives of implementation of un-interrupted Water Supply to the entire city:

1. Implementing good engineering practices to upgrade existing network including replacement of

old worn out pipes.

2. Studying in detail the existing distribution network, zones, sub zones and revamping the existing

water supply network and providing the additional storage reservoirs wherever necessary for 24 X

7 un-interrupted water supply including disinfection methods.

3. Increasing the zones and sub zones with assured storage facilities for entire city.

4. Providing consumers with an 24 X 7 un-interrupted water supply at desired pressure

5. Reduction of Un-account for Water (UFW) to within 15% by reducing leakages and unmeasured



46

supply.

6. 100% metering with good quality meters having long life spans.

7. Improving billing mechanism (Reading, bills generation & distribution) to reduce time & cost per

bill including spot billing system etc.

8. Better services to urban poor by implementation of slum policy of Government of Tamilnadu.

9. Attending consumer complaints within short time.

10. Improving the satisfaction of stake holders.

11. Accountability on design, implementation, and O&M with single agency through performance

based contract and bench marking of services.

12. Implementing the lessons learnt from pilot zones to other parts of city.

13. Digital map of each rezoning distribution network to the entire city.

14. Preparation of detailed project report and Bid Document including the plan polio.

2.3.2 Objective: B

1. To introduce continuous, pressurized and improved water supply services in the Demonstration

Zones for a period of 5 years.

2. To undertake a structured prudent rehabilitation program of optimizing the performance of

existing infrastructure assets to improve the efficiency of the water supply service in the

Demonstration Zones.

3. To establish, within the chosen Demonstration Zone, an efficient and effective customer contact

centre offering billing, collection and complaint redressal support services.

4. To operate, maintain and manage the water supply services at the specified performance levels or

higher in the Demonstration Zone.

5. To provide efficient and effective metered, measured and monitored water services ensuring

equity and cost recovery at the tariff levels fixed by Coimbatore City Municipal Corporation from

time to time.

6. Preparation of DPR as per TOR including bid documents.



47

2.4 Selection of Design Basis

Feasibility analysis of the existing water supply system is done to enhance the service level for

Continous pressured Water Supply facility for the intermediate & ultimate demand for the city.

The study of the two water supply systems was made on bulk water source sustainability and the

following are the observations,

Sources

The Water that could be drawn from Pillur reservoir

for the scheme is 125 Mld, due to the carrying

capacity of raw water and clear water tunnels. The

supply from the Siruvani System is only 75 Mld. So

the total expected supply is 200 Mld. However the

Intermediate requirement is 227 mld. So there is a

short fall of 27 Mld

In Siruvani source, there is reduction in drawl of

water to 50 Mld during poor monsoon periods and the

worst reduction experienced is 25 Mld

The Siruvani and Pillur WSSs are interconnected at

possible locations to manage the problems on

temporary measure

As the quantum of supply from Siruvani Water Supply System depends on Kerala state, the original

allocation of 75 Mld only could be adopted. The balance 152 Mld could be met from Pillur source

which is within Tamil Nadu, to meet the Intermediate Demand of 227 mld, as this is a dedicated

scheme for coimbatore corporation and the required decisions to draw additional quantity could be

taken by the Corporation themselves at any point of time.

2.4.1 Flow Reliability Analysis on Pillur Source

For augmentation of water supply from any source, it is necessary to establish 95% reliability of flow

occurrence at source. Entire water collected at various reservoirs at the upper reaches of river Bhavani

are the sources for Pillur. There are about 12 reservoirs at the upper reaches other than Pillur Dam.

The entire water comes to Pillur Dam after power generation at various power houses. The immediate

Fig. No. 7 - Siruvani Dam

Fig. No. 8 - Pillur Dam



48

power station above Pillur Dam is Kundah Power House III which has an installed capacity of 3 x 60

MW = 180 MW with a maximum discharge of 1800 cusecs. So, there is enough water available after

power generation to meet the Intermediate & Ultimate requirement.

A Statement showing the year wise inflow into Pillur Dam Reservoir from 1966 to October 2008,

collected from TNEB is furnished below in Table No. 2.1

Table No. 2.1 - Inflow into Pillur Dam Reservoir (1966 – 2008)

Year Inflow in

mcft Year

Inflow in

mcft Year

Inflow in

mcft Year

Inflow in

mcft

1966 24112 1976 19378 1986 22072 1997 30806

1967 27459 1977 32105 1987 11943 1998 32951

1968 26153 1978 30545 1988 21900 1999 28009

1969 22489 1979 50467 1989 21694 2000 22918

1970 24665 1980 40546 1990 16995 2001 21277

1971 28356 1981 38400 1991 27913 2002 13075

1972 25523 1982 21268 1992 49432 2003 6897

1973 33062 1983 22256 1993 22524 2004 30001

1974 28655 1984 27459 1994 34148 2005 36992

1975 30952 1985 18595 1995 21820 2006 34497

1996 28470 2007 42358

Upto

10/2008 18892

A flow duration analysis is arrived in order to establish the 95% reliability of flow in the river. It was

found that the source reliability for Pillur reservoir is more than 100 %.The details of the calculation

was listed in Table No. 2.2.

49

Table No. 2.2 - Pillur Dam Source Realiability Analysis

Year Yearly Inflow to Pillur

Reservoir (mcft) Yearly Inflow (Mm3) Inflow (Mld) Requirement (Mld) Excess (Mld) % Excess

1966 24112 682775887 1870618868 215 1870618653 > 100 %

1967 27459 777552384 2130280504 215 2130280289 > 100 %

1968 26153 740570578 2028960488 215 2028960273 > 100 %

1969 22489 636817640 1744705863 215 1744705648 > 100 %

1970 24665 698435105 1913520836 215 1913520621 > 100 %

1971 28356 802952599 2199870134 215 2199869919 > 100 %

1972 25523 722730963 1980084830 215 1980084615 > 100 %

1973 33062 936211695 2564963548 215 2564963333 > 100 %

1974 28655 811419337 2223066677 215 2223066462 > 100 %

1975 30952 876463141 2401268879 215 2401268664 > 100 %

1976 19378 548723919 1503353203 215 1503352988 > 100 %

1977 32105 909112469 2490719093 215 2490718878 > 100 %

1978 30545 864938183 2369693652 215 2369693437 > 100 %

1979 50467 1429066469 3915250600 215 3915250385 > 100 %

1980 40546 1148135000 3145575342 215 3145575127 > 100 %

1981 38400 1087367040 2979087781 215 2979087566 > 100 %

1982 21268 602242766 1649980181 215 1649979966 > 100 %

1983 22256 630219814 1726629627 215 1726629412 > 100 %

1984 27459 777552384 2130280504 215 2130280289 > 100 %

1985 18595 526551826 1442607742 215 1442607527 > 100 %

1986 22072 625009513 1712354830 215 1712354615 > 100 %

1987 11943 338188140 926542849 215 926542634 > 100 %

1988 21900 620139015 1699011000 215 1699010785 > 100 %

50

Year Yearly Inflow to Pillur

Reservoir (mcft) Yearly Inflow (Mm3) Inflow (Mld) Requirement (Mld) Excess (Mld) % Excess

1989 21694 614305744 1683029436 215 1683029221 > 100 %

1990 16995 481244866 1318479085 215 1318478870 > 100 %

1991 27913 790408234 2165502011 215 2165501796 > 100 %

1992 49432 1399758529 3834954874 215 3834954659 > 100 %

1993 22524 637808729 1747421175 215 1747420960 > 100 %

1994 34148 966963794 2649215874 215 2649215659 > 100 %

1995 21820 617873667 1692804567 215 1692804352 > 100 %

1996 28470 806180720 2208714301 215 2208714086 > 100 %

1997 30806 872328881 2389942140 215 2389941925 > 100 %

1998 32951 933068524 2556352121 215 2556351906 > 100 %

1999 28009 793126652 2172949732 215 2172949517 > 100 %

2000 22918 648965568 1777987858 215 1777987643 > 100 %

2001 21277 602497617 1650678403 215 1650678188 > 100 %

2002 13075 370242814 1014363874 215 1014363659 > 100 %

2003 6897 195301314 535072093 215 535071878 > 100 %

2004 30001 849533817 2327489910 215 2327489695 > 100 %

2005 36992 1047496915 2869854562 215 2869854347 > 100 %

2006 34497 976846374 2676291436 215 2676291221 > 100 %

2007 42358 1199445132 3286151047 215 3286150832 > 100 %

2008 18892 534961930 1465649123 215 1465648908 > 100 %

The table above presents the comparative calculation between inflow into the Pillur reservoir and the water requirements of the corporation. The available

inflow is well above the quantity of flow to be augmented which is 152 Mld in the intermediate year of 2029 and 215 Mld in the ultimate design year of 2044.

Thus, the quantity of water intended for water supply augmentation to Coimbatore Corporation by utilizing the Pillur reservoir as a dependable source has a

probability of flow occurrence well higher than the intended 95% dependable flow and can therefore be used to cater to the intended water supply.



51

2.5 Deficiencies of the Existing Water Supply System

It is evidenced from the above Source Reliability Analysis, that the Pillur source is more than

adequate to meet the project requirement. The water quantity is much excess that it can cater to more

than multiple times the requirement of the Coimbatore corporation. It is also evidenced that the

prevailing Tunnels can carry more water as compared to the intermediate and ultimate requirement of

the corporation, if the depth of water flow in the tunnel is increased. So as far as the Bulk water /

source of water, Coimbatore corporation possess excess quantity of water and also adequate

infrastructure to bring until the Master Service Reservoirs at Ramakrishnapuram. Since Siruvanui

being the interstate source, source augmentation / source improvement shall not be possible.

Subsequently Pillur being allocated as reliable / perennial source for the corporation, restricting

Siruvani to 75 Mld until the ultimate stage of the project.

Under the present scenario, the water supply infrastructure from Master Service Reservoirs to End

Consumers namely prevailing service reservoirs, feeder mains, pumpsets, sumps, distribution system

pipelines, water meters has been analysed in detail with data collected through field visits, data

available from the corporation, etc., After detailed investigation, it is understood that the present

service level of the Coimbatore Corporation ranges from 75 lpcd to 125 lpcd (Based on sample

studies made) that too with the intermittent supply of 3 to 4 hours a day, once in a 3 to 4 days a week

(Under worst case scenario) with residual pressure ranging from 0.1 m to 2 m (Based on sample

studies made) at the house service connections.

There was also list of frequent compliant on the present water supply system, exspecially the

Distribution System by various Councillors / elected representatives in Councillors Grievances in

Zonal meeting. The salient complaint list were as follows,

1. Inadequate Water Supply & inadequate pressure

2. Frequent burst & breakdowns in pipes

3. Contamination due to mixing of sewage

4. Blockage of pipes

5. Water received only when pumped by hand pumps from the HSC

6. Presence of Old pipes with frequent leaks

7. Limited hours of supply

The above such complaints were collected by the consultant from the ward wise councillors in the

Grievance meeting and the cause for such defeciences, remedial measures was elaobarated to all the

councillors attended the meeting. The details of the same was enclosed Volume I (b) Annexure

Number – A2 part of this DPR.



52

2.6 Project Benchmarks

As Coimbatore, one of the major and fast growing industrial hub of Tamil Nadu next to Chennai, the

infrastructure should meet the requirements of the growing population. As water supply is one of the

basic essential amenities, coimbatore corporation planned to revamp the present intermittent water

supply to a 24x7 type of water supply with the salient bench marks envisaged as per the CPHEEO

norms. The following Table No. 2.3 illustrates the project bench mark after the implementation of the

project.

Table No. 2.3 - Project Benchmarks

S.No Propsoed Indicator After Implementation

1 Coverage of Water Supply Connection 100 %

2 Per capita availability of Water at consumer end 135 lpcd

3 Extent of metering of water connections 100 %

4 Extent of Non – revenue water 15 %

5 Continuity of water supply 24 X 7

6 Efficiency in redressal of customer complaints 80 %

7 Adequacy of treatment & disinfection and quality of

water supplied 100 %

8 Cost recovery in water supply services 100 %

9 Efficiency in collection of water supply related charges 90 %

10 Number of persons receiving less than 70 lpcd 0 %

2.7 Need for the Project

In order for the corporation to meet the project benchmarks, the prevailing system components were

analysed with respect to the objective and are presented in synopsis as below. The detailed

calculations, analysis made were presented in Annexure part of this DPR and the proposed system

were elaborated in respective portion of the DPR.

1. Existing Feeder Mains

Mainly of AC, PSC & CI Pipes with frequent Leaks with 78 Kms pipe length

No Bulk water meters to quantum of water / Inflow or Outflow in the feeder mains

UFW in Pillur Feeder Main is 23.55 % and in Siruvani Feeder Main is 22.37 % as

compared to permissible limit of 5 %. The details of the same are enclosed in

Volume I (b) Annexure Number – A4 part of this DPR.

Direct tapping to Distribution System before Service Reservoirs

Separate bulk water supply line is observed to Jail area, Railways, etc.,



53

2. Existing Service Reservoirs & Storage Sumps

The following gives the list of Service Reservoirs in Dilapted condition and also

with less staghing height not suitable for a 24x7 type of water supply system

Sl.No. SR Location Ward Number

(Old) Capacity (LL)

1 Maniyakaram Palayam SR 72 1.00

2 Police Quarters SR 72 0.50

3 V.V.Nagar SR 72 0.50

4 V.O.C Nagar Sump 72 0.50

5 Ganapathy Ma Nagar Sump 72 3.00

6 Gandhi Ma Nagar Sump 72 6.00

7 Housing Unit Sump 3 0.50

8 Nanjundapuram SR 12 2.00

9 Sowripalayam SR 14 5.00 (Staghing Height – 8m)

10 Varadharajapuram SR 11 10.00 (Staghing Height – 8m)

11 Uppilipalayam SR 11 10.00 (Dilapted Condition)

12 Bharathi Park GLSR 34 10.00

13 Bharathi Park GLSR 34 10.00 (Dilapted Condition)

14 Gandhi Park GLSR 51 10.00

15 SIHS Colony Sump 4 3.00

3. Distribution System

Mainly of PVC, PSC & CI pipes with 1122 Kms pipe length

Many new layouts and uncovered areas without water supply is about 253 Kms

Major portion of corporation (namely North, East, South & Central) are Panchayats

earlier except that of the West Zones served by Siruvani which was the old town. The

water supplied at the rate of 70 lpcd earlier as per the norms of Town Panchayats. So,

the pipe sizes are capable of supplying 70 lpcd only as compared to the required rate

of 135 lpcd

Many D’System are supplied by more than one or two service reservoirs

simulatneosuly due to inadequate pressure, if supplied via single service reservoir

Almost all the wards faces Inadequate Water Supply & inadequate pressure, Frequent

burst & breakdowns in pipes, Contamination due to mixing of sewage, Blockage of



54

pipes, Water received only when pumped by hand pumps from the HSC, Presence of

Old pipes with frequent leaks, Limited hours of supply, etc.,

Sample leak register in ward 71 (one of the biggest ward served by

Ramakrsihnapuram MSR) shows a reported leaks of 140 numbers within a short

period of 3 months. With such leaking condition, that too with the intermittent type of

supply, there was objection by the general public to ascertain UFW in D’System.

Hence, sample studies were made to ascertain UFW, Pressure in the D’System. The

details of the same are enclosed in Volume I (b) Annexure Number – A4 part of

this DPR

Piece meal extension of pipelines then and there to meet immediate requirement

without meeting the hydraulic requirement of the D’System.

4. House Service Connections

Mainly of regular water meters for individual houses and public stands for slums and

other public areas.

Meter readings are taken manually with the help of meter readers. There are nearly 20

number of meter readers for the North Zone alone captured meter readings in more

than 25 meter reading register

Meter readings are not taken in a uniform manner i.e., not taken every month /

bimonthly basis, rather 3 or 4 readings were taken every year.

Only Single water meter connection is given for Apartments / residential complex or

buildings with more tenants, inspite of many occupants.

1,31,239 Meters are in working condition and 11,812 Meters are not functioning.

As mentioned above, the water supply components starting from Master Service Reservoirs namely

feeder mains, service reservoirs, D’system, House Service Connections are much in dilapted condition

(as compared to bulk water) to fulfill the water supply requirement as per the project benchmarks.

Hence a detailed analysis and revamping of the above said components is required and hence form the

need of the assignment.



55

S.No Propsoed Indicator Before

Implementation

After

Implementation

1 Coverage of Water Supply Connection 95.37 % 100 %

2 Per capita availability of Water at

consumer end

70 – 125 lpcd

(Once in 4 to 5 Days)

135 lpcd

(Daily)

3 Extent of metering of water connections 87.49 % 100 %

4 Extent of Non – revenue water 23 % 15 %

5 Continuity of water supply

Intermittent (Once in 2 to

3 Days a week , 2 to 3

Hours a Day)

24 X 7

6 Efficiency in redressal of customer

complaints 80 % 80 %

7 Adequacy of treatment & disinfection

and quality of water supplied Nil 100 %

8 Cost recovery in water supply services 89 % 100 %

9 Efficiency in collection of water supply

related charges 70 – 80 % 90 %

10 Number of persons receiving less than 70

lpcd Nil 0 %

2.8 Technical Solutions towards Project Benchmarks

2.8.1 Methodology for 24 X 7 WSS

The prerequisites for the design and monitoring of 24 X 7 system are discussed below

(i) Back drop drawing

The satellite pan sharpened digitized image of 0.6 resolutions for the city can be digitized to a vector

image in a DXF format and this image could be used as a backdrop drawing for hydraulic model, but

the same is not available with the Coimbatore Corporation. Hence the survey drawing obtained from

Corporation dually vetted is used as the base drawing for the preparation of existing network.

(ii) Operational Zones

The town has to be rezoned into various operational zones for designing of 24 X 7 WSS. The existing

storage and the additional storage systems for the design demand are worked out and rezoning was

done, identifying new reservoirs required in additional to the existing reservoirs. Each SR with its

serving area will form an operational zone and the water from the MSR is gravitated to each SR. The



56

operational zones are demarcated for the consideration of the critical study of storage of SR and

consumer withdrawal pattern. The operational zones are the strategic blocs for transformation into 24

X 7 system. Accordingly 63 operational zones are now proposed.

(iii) District Metering Areas

Each operational zone is divided into smaller sub zones called District Metering Area (DMA) for

efficient monitoring of water supply service. Every DMA will be hydraulically discrete (isolated)

from adjoining areas. The water will be supplied to each DMA through single inlet with meters. All

the house service connections within the sub zones will be metered. The flow and pressure at critical

locations will be continuously measured and logged which will give indication of extent of leakages

as well as flow rates. The leakages identified are to be rectified and located irreparable pipes, valves

etc. are to be replaced. Control measures will be adopted to ensure equitable flow irrespective of

ground flow variation. In the present context, 101 DMAs are proposed for the 63 operational zones.

(iv) Hydraulic Model

Hydraulic modelling of the existing water distribution network is a critical part of designing 24 X 7

system. It gives commanding knowledge of the water infrastructure and helps to take informal

decisions. Modelling is defined as a mathematical description of a real world system, infrastructure of

entire city water supply including those of all pipe lines and the valves plotted on the backdrop

drawing based on topo survey. The process is called active topology. Hydraulic modeeling of all the

100 DMAs are prepared and analysed.

(v) Simulation of DMAS

Vast data sheets are needed to be created and handled. Large numbers of model runs are required and

also recording of their results. It may not be possible to create various data files to edit input data in

each data file. Working with many data files or editing frequently with single data file will be

confusing, inefficient and susceptible for human errors. Hence three alternate data sets are to be kept

with single model data file.

a. Action topology – Physical representation of the system and its properties

b. Demand – Various types of demands of network

c. Operation – Valves, their settings and operations.

The hydraulic network of scenario of each DMA is then solved and the results checked. Study is

focused on the leakage rates by comparing model results with actual results in the field. According to

model design operational zones and DMAs are made hydraulically discrete at site of work. As per



57

hydraulic analysis carried out by the hydraulic model, new pipe lines will be laid replacing inadequate

size or defective old pipes will be replaced. Using DMA, NRW for each DMA will be worked out

and could be tackled, one by one based on priority.

(vi) Bulk Water Meters and Consumer Water Meters

Bulk water meters will be installed to measure the quantum of water that is entered into a DMA and

100 % HSCs are proposed to be installed with consumer water meters to measure the quantity of

water consumed as aforesaid.

2.8.2 Instrumentation for 24 X 7 WSS

Sluice / Scour Valves

Sluice valve is used for flow control, isolation of sub zones and for

carrying out O & M works. There are DI sluice valves of class PN-

10 which are available in market with resilient seated, without valve

pits, buried underground with telescopic extension rod with soft

sealing without gland, flat gate bottom with lining conformed to IS

14846/BS 5163/DIN 3202. These hi-tech valves are more suitable to

places where very high traffic load is experienced and carrying out

O & M practise will be cause for disturbance to the traffic, these

buried type application are suitable. These type of valves are

proposed for the entire Coimbatore corporation.

Importance of Air Management in 24/7 Water Supply Distribution Systems

The first step towards 24 X 7 water supply is strengthening of existing distribution system both in

terms of flow capacity as well as minimizing the leakage potential. One of the main reasons for

excessive leakage in 24 X 7 water supply system is the uncontrolled entry and exit of air into the

distribution system that damages the pipe joints.

Most water distribution systems in the country are old and are in bad shape in terms of leak

prevention. A major portion of the leakage in distribution systems occurs at pipe joints when the pipe

systems are prone to excessive leakage. Therefore understanding the air-water interaction and proper

management of air in distribution systems is at most important for minimizing the leakage in water



58

supply systems.

Air may enter the pipe distribution network from supply source even in continuous water supply

systems. If the treated water enters the clear water tank in the form of a plunging jet the resulting

turbulence can entrain air that gets transported into the distribution system. Dissolved air present in

high pressure water may be released when the water passes through low pressure regions. Air enters

the distribution network from the delivery points (typically connections to underground sumps or

elevated household storage tanks) if the pipelines gets drained partially or completely. Air may also

enter through the leaky joints at high elevation points along the pipelines.

Air that has entered the distribution system gets vented out during the subsequent filling cycle of

supply of water to consumers. If the flow velocity is not sufficient, air bubbles get accumulated at the

pipe crown, horizontal bends, and/or high elevation points. This may get compressed when the water

pressure reaches those locations. Pockets of compressed air may choke the flow reducing the delivery

efficiency of pipelines. Sudden movement of choked air may generate undue stresses on pipe joints

which in turn may create or exacerbate the existing leaks.

Proper venting of entrained air is very important for efficient operation and longer life of water supply

systems. Appropriately sized and judicially placed good quality air valves will vent the air out of the

system without creating choking conditions and the associated pipe joint problems. Air may continue

to create choking conditions while larger orifice sizes than the desired values may lead to air valve

slam and associated surge pressure which may damage the pipe joints eventually leading to leaky

joints. Inefficient air valves may lead to more problems than not having them. For example improper

float design may lead to premature closure of the air valve resulting in small but potentially dangerous

(elsewhere in the distribution system) pressure surges. The use of larger air valve may lead to

frequent pipe breaks from the location of the improperly sized air valve. Premature closure also

results in trapping of compressed air which leads to choking of water flow. Proper venting of air from

the distribution system especially near the consumer meter is essential to avoid over charging the

consumer. Compressed air pocket passing through a water meter makes the meter record much higher

flow quantities than water. Such overcharging may eventually lead to mistrust and eventual misuse of

water meters. While proper venting of air is important during the filling and delivery cycle of water to

the consumers, letting air into the system during the draining cycle (after the flow has ceased entering

the distribution system) is also very important to prevent low pressures in the system which can

potentially be more detrimental on the pipe joints. Most pipe joints can withstand fairly positive

pressures but may not be able to withstand negative pressures. Such joints are highly susceptible for

leakage when they are subject to high negative pressures. In continuous water supply systems, low

pressures in the distribution system occur only during abnormal operation such as power failure



59

Air Venting Valve

conditions resulting in simultaneous tripping of all operating pumps. The high elevation points, if not

ventilated properly will also develop cracks at the joints and eventually contribute to excessive

leakage.

Proper ventilation of the distribution system by way of appropriately sized air release can prevent

unwanted leaks at pipe joints. The importance of good quality air valves are contributing in

preventing premature closure and the associated secondary surge pressures which may eventually

damage the pipe points thereby increasing the leakage potential. Improper sizing and placement of air

valves may cause more damages to the system than not having them.

Suitable types of air valves at appropriate locations are suggested for effective Air management in the

distribution system. Duojet airvalves proposed in the estimate is highlighted below.

Kinetic / Duojet Air Valves (Single Cylinder Type)

The Kinetic or Duojet type single chamber DI air valve with SS internal

parts are used for effective release of air from the pipe line system. These are

improved models of automatic air valves available in the market compared

to the conventional air valves. These are proposed for improved performance

to monitor the air management in water supply distribution system. As these

valves have single cylinder operation they are resistant to tamper proof.

2. Introduction of Technically Upgraded AMR Water Meters

Bulk Water Meter conformed to ISO 4064

The high accuracy, low loss of head, SS/glass encapsulated and guaranteed

against fogging registers, adoptable to 2G/3G technologies, bulk water

meter PN 1.6 class of size 50 mm to 300 mm with tungsten carbide

impeller shaft tips & bearings, polyester coated CI/Bronze body bulk

water meter with +/- 2 to 5% accuracy conformed to ISO

4064/AWWA/EEC. These meters are proposed at the start of every Distribution System to

measure the quantum of water that is being fed into the D’system.

Consumer Water Meters ISO 4064 instead of IS 779



60

Fig. No. 9 - Mobile Meter

Reader

The multijet magnetic consumer water meter of size 15 mm to 50 mm PN 1.0 with corrosion

proof copper alloy body, SS / encapsulated magnetically driven sealed registers guaranteed

against fogging with +/- 2 to 5% accuracy etc conformed to ISO4064/AWWA/C708/SI63 are

proposed at Consumer end for Domestic & Commercial tapping of water in the Distribution

System. They are capable of operating with Automatic Meter Reading System (which will be

dealt in the coming session), tamper proof, etc.,

Data Logger for Flow & Pressure Measurement

A battery operated data logger for pressure and flow recording for every 10 minutes or at any

desired time interval is proposed to have a real data base of the hydraulics in the Distribution

System.

Handset for Mobile Meter Reading

The hand held solution for mobile meter reading is an option to have

the Hand Set rated at IP 65 for dust and water proof, using Easyroute,

Mobileroute software to optimise radio reading, uploading and

downloading routes from/to the host computer programming of

radiometer modules, graphical display of data facility etc to improve

the efficiency of the meter reading system.

Walk by Meter Reading

The walk by meter reading is a data collection system with automatic reception of metering

data directly to hand held computers (palm pilot). This proposed option is for meter reading

with all recognized mini terminals, transmission of commands directly to the meter, remote

meter on/off etc to simplify the meter reading process.



61

Fig. No. 10 - Walk by Meter Reading

Radio Module for Remote Water Reader

The proposed Radio Module for Remote Water Reader

is another technology option available in the market

compatible with water meters from DN 15 to 500 mm to

store records spanning 13 months, even work in

congested areas.

2.8.3 Disinfection Process for 24 X 7 WSS

The disinfection proposed is Gas Chlorination system at MSR.

2.8.4 24 X 7 Customer Care Centre

The 24 X 7 customer care centre with billing and collection software including complaints redressal

module and monitoring is proposed.

2.8.5 Introduction of Volumetric Rational Tariff

The tariff plays a vital role in revenue generation of any water supply system to make it self

sustainable. A suitable methodology for designing volumetric tariff will be proposed after approval of

the final cost estimate considering subsidiary for poor category.

2.9 Physical Infrastructure Components

2.9.1 Formulation of Design Basis

(i) Design Parameters

The design parameters for designing water supply systems was adopted as per CPHEEO manual on

Water Supply and also considering TWAD (Tamil Nadu Water Supply & Drainage Board) norms as

mentioned in the given Table No. 2.4



62

Table No. 2.4 – Hydraulic Design Parameters

Sl.No Parameters Data

1 Ultimate Design period (Approved) 30 yrs (2014 to 2044)

2 Intermediate period (Approved) 15 yrs (2014 to 2029)

3 Pumping hours for intermediate and

ultimate demand 22 hours

4 Per capita supply 135 lpcd

5 Intermediate Commercial & Industrial

demand 9.98 mld

6 Ultimate Industrial and Commercial

demand 17.25 mld

7

UFW in the system (Maximum) 15%

a) Feeder or Conveying Mains 5 %

b) Distribution System 10 %

8 Materials for pipes for Distribution

System

90 to 315mm – HDPE PN6 PE100

> 350 mm – DI S/S K7 pipes

9

Materials for pipes for Feeder Mains

(As per TWAD Norms)

< 200 mm – HDPE

200 – 600 mm – DI S/S K7 Pipes

> 600 mm – MS Pipes

a) Class of Pipes

HDPE –PN 6-PE 100 for Gravity Mains

HDPE – PN 8- PE 100 for Pumping Mains

DI K7 S/S for Gravity & Pumping Mains

MS (With minimum of 8mm thickness for

Gravity Mains)

10 Hazer William’s factor “C” for pipes

Proposed Pipes 140 for DI & MS Pipes and

145 for HDPE Pipes

Existing Pipes 100 for CI Pipes

11

Service Reservoirs

a) Storage Capacity 1/3 rd of Intermediate Demand

b) Capacities Rounded Off to nearest One Lakh Litres as per

TWAD Norms for Urban water supply schemes

c) No. of Compartments Generally 2 for more than 10 LL

d) Staghing Height 12 to 15 m

e) Shape Circular

12

Distribution System

a) Minimum Residual Head at Ferrule

Point

12 m for Proposed SR’s (and also for existing

SR’s wherever possible) and

7 m for Existing SR’s

b) Pressure Variation within the Zones Within 5 m

c) Peak Factor

3.00 for Population < 50,000

2.5 for Population from 50,000 – 2,00,000

2 for Population > 2,00,000

13 Underground Sumps Detention Time of 30 & 60 minutes as per

TWAD Norms

(ii) Population Projection

The population projection was done by the following methods namely,

1. Arithmetical Increase Method



63

2. Incremental Increase Method

3. Geometric Increase Method

4. Line of Best Fit Method

5. Graphical Method

The calculations are enclosed in Volume I (b), Annexure Number – A1 part of this DPR. The

population projected by Geometric Incremental Method gives much higher value and also much

suitable for growing towns and cities having vast scope of expansion like Coimbatore as

recommended by CPHEEO under Clause 2.2.7 on Population Forecast. The same projection method

is also approved under JNNURM Pillur Scheme – II for Coimbatore Corporation in the Terms of

Reference and also in City Development Plan of Coimbatore Corporation. So, the Graphical

Incremental Method for population projection is adopted unanimously for this project. The projected

population is also listed below in Table No. 2.5.

Table No. 2.5 - Projected Population under Geometric Incremental Method

Sl No Year Project Stage Population (Nos)

1 2011 Census Population 10,61,447

2 2014 Base Year 11,10,933

3 2029 Intermediate Stage 13,95,199

4 2044 Ultimate Stage 17,52,203

(iii) CDP Observations for Demand Projection

CDP recommends ward density pattern, which is the ratio of ward spread area and the ward

population. Accordingly the wards are categorized as low dense, medium dense, high dense, very high

dense and saturated wards. Population projection factor was considered primarily based on the CDP

(City Development Plan) recommendations and also as per the growth rate of the city, expected new

layouts, vertical growth, urban poor, slums, land use pattern, residential and commercial properties

and industries, etc against each individual 72 wards (old) during the site visit made.

The low dense wards are given a maximum growth factor of 2.00 followed by medium dense wards of

1.70, high dense wards of 1.50, very high dense wards of 1.30 and saturated wards of 1.20.

The ward wise population density with the summary of density pattern, population projection factor

and the ward wise population projection are listed in Table No. 2.6, 2.7, 2.8 & 2.9 respectively. The

ward boundary of the entire city was explicated in Dwg No – 10/1811150/WSS/WIN/003, Volume

VI part of this DPR.



64

Table No. 2.6 – Ward Wise Population Density

Ward

No.

2001

Population

(Census

Population)

2011

Population

(Projected from

2001

Population)

Ward

Road

Length

(m)

Area

(Sq.Km)

Density Pattern as

per 2011 Projected

Population

(Persons / Sqkm)

Density

Type (As

per 2011

Projected

Population)

(1) (2) (3) (4) (5) (6) = (3) / (5) (7)

1 13218 15116 31071 2.05 7378 Low

2 13663 15624 25160 1.67 9345 Low

3 13534 15477 47192 4.69 3300 Low

4 18398 21023 63728 4.95 4249 Low

5 14201 16237 19144 1.23 13157 Medium

6 14632 16729 36797 4.57 3663 Low

7 14663 16764 26203 4.72 3552 Low

8 11037 12629 14746 0.80 15775 High

9 17753 20287 27333 1.73 11707 Medium

10 16768 19164 37960 1.86 10307 Medium

11 14889 17022 21187 1.32 12865 Medium

12 12326 14099 26181 4.81 2930 Low

13 15097 17259 24871 4.65 3715 Low

14 11935 13653 28506 2.98 4582 Low

15 13505 15444 19397 1.15 13409 Medium

16 21525 24589 28913 2.06 11948 Medium

17 18294 20904 42378 2.86 7305 Low

18 13126 15011 12262 0.67 22270 High

19 15451 17663 12878 0.85 20901 High

20 8602 9853 9960 0.53 18618 High

21 12746 14578 12120 0.64 22908 High

22 14213 16251 10274 0.51 31714 Very High

23 15320 17513 15093 0.72 24367 High

24 11542 13205 11286 0.47 27981 Very High

25 9532 10913 22333 2.01 5437 Low

26 14810 16932 16537 2.07 8179 Low

27 11495 13152 12751 1.02 12850 Medium

28 10035 11487 12386 1.30 8866 Low

29 9997 11444 9042 0.40 28784 Very High

30 9243 10584 6363 0.29 36343 Very High

31 8886 10177 11274 0.68 15033 High



65

Ward

No.

2001

Population

(Census

Population)

2011

Population

(Projected from

2001

Population)

Ward

Road

Length

(m)

Area

(Sq.Km)

Density Pattern as

per 2011 Projected

Population

(Persons / Sqkm)

Density

Type (As

per 2011

Projected

Population)

32 9290 10637 6246 0.36 29452 Very High

33 11825 13528 8056 0.77 17525 High

34 15954 18236 21154 1.49 12206 Medium

35 6155 7063 4229 0.36 19634 High

36 11022 12612 5178 0.51 24830 High

37 7081 8119 5526 0.24 34304 Very High

38 6781 7777 5922 0.34 22591 High

39 6349 7284 3258 0.34 21297 High

40 10911 12486 2205 0.14 88072 Saturated

41 8072 9249 4214 0.16 57452 Saturated

42 12336 14111 13185 1.28 11066 Medium

43 12086 13826 5375 0.22 61669 Saturated

44 14057 16073 6212 0.34 47303 Saturated

45 8724 9992 6199 0.27 36860 Very High

46 10019 11469 2096 0.10 118448 Saturated

47 10042 11495 5038 0.17 66171 Saturated

48 9771 11186 2817 0.12 90986 Saturated

49 10613 12146 14821 1.01 12079 Medium

50 5677 6518 8452 0.47 13824 Medium

51 9156 10485 8069 0.60 17363 High

52 12451 14242 11055 0.63 22614 High

53 13461 15393 7262 0.33 47041 Saturated

54 26056 29755 28722 4.09 7270 Low

55 12901 14755 31946 4.42 3338 Low

56 15425 17633 19776 1.02 17221 High

57 14466 16539 17709 4.38 3778 Low

58 11146 12754 17025 2.22 5740 Low

59 13868 15858 22564 1.71 9295 Low

60 13282 15189 11891 1.25 12132 Medium

61 15085 17245 16473 1.01 17127 High

62 10821 12383 18470 0.78 15910 High

63 10490 12006 8185 0.41 28983 Very High

64 9810 11230 9158 0.53 20991 High

65 11640 13317 39126 2.57 5185 Low

66 21799 24901 26543 1.47 16914 High

67 12863 14712 8370 0.31 48134 Saturated



66

Ward

No.

2001

Population

(Census

Population)

2011

Population

(Projected from

2001

Population)

Ward

Road

Length

(m)

Area

(Sq.Km)

Density Pattern as

per 2011 Projected

Population

(Persons / Sqkm)

Density

Type (As

per 2011

Projected

Population)

68 5668 6507 4193 0.17 37448 Very High

69 20917 23895 17470 0.83 28707 Very High

70 16153 18463 28603 1.70 10873 Medium

71 11058 12653 10826 0.57 22073 High

72 32360 36943 105300 5.65 6542 Low

Total 930822 1061447 1294245 105.62

Table No. 2.7 - Summary of Density Pattern

S.No Density Pattern Range (Persons / Sq.km) No. of wards

1 Low Dense Wards 0 - 10000 20

2 Medium Dense Wards 10000 - 15000 13

3 High Dense Wards 15000 - 25000 20

4 Very High Dense Wards 25000 - 45000 10

5 Saturated Wards > 45000 9

Total 72

Table No. 2.8 – Population Projection Factor

No of Wards Density Type Projection Factor

23 Low Dense Wards 2.00

15 Medium Dense Wards 1.70

16 High Dense Wards 1.50

12 Very High Dense Wards 1.30

6 Saturated Wards 1.20



67

Density Pattern in Coimbatore

Saturated Wards

9 NosVery High Dense

Wards

10 Nos

High Dense

Wards

20 NosMedium Dense

Wards

13 Nos

Low Dense

Wards

20 Nos

Fig. No. 11 - Density Pattern of Wards in Coimbatore

68

Table No. 2.9 - Ward Wise Population Projection

S.No Ward

No

Ward Spread Area Density

Pattern as

per 2011

Projected

Population

(Persons /

Sqkm)

Density

Type

(As per 2011

Projected

Population)

Additional Settlements

(As per Site Visit)

CDP

Observations

Population

Projection

Factor

Projected

Population

for the

Year 2044

(Ultimate

Stage) Sqm Sqkm New Layouts

Vrtl

Exp

Slum

Population

1 1 2048784 2.05 7378 Low 338 Sites - 1005 Future High

Growth 2.00 30292


Growth 2.00 31307

3 3 4690145 4.69 3300 Low 349 Sites (High

as per CDP) - 761

Future High

Growth 2.00 31013

4 4 4947559 4.95 4249 Low 715 Sites (High

as per CDP) - 1409

Future High

Growth 2.00 42105

5 5 1234088 1.23 13157 Medium 202 Sites (High

as per CDP) - 1458

Normal

Growth 1.70 27663

6 6 4566838 4.57 3663 Low 638 Sites (High

as per CDP) - 1135

Future High

Growth 2.00 33517

7 7 4719701 4.72 3552 Low 139 Sites (High

as per CDP) - 535

Future High

Growth 2.00 33587

8 8 800585 0.80 15775 High 156 Sites - - 1.50 19003

9 9 1732966 1.73 11707 Medium 636 Sites - 1475 Normal

Growth 1.70 34548


Growth 1.70 32639


Growth 1.70 28996

69

S.No Ward

No


Pattern as

per 2011

Projected

Population

(Persons /

Sqkm)

Density

Type

(As per 2011

Projected

Population)


(As per Site Visit)

CDP

Observations

Population

Projection

Factor

Projected

Population

for the

Year 2044

(Ultimate


Vrtl

Exp

Slum

Population


Growth 2.00 28258


Growth 2.00 34577

14 14 2979776 2.98 4582 Low - 675 Future High

Growth 2.00 27366


Growth 1.70 26313


Growth 1.70 41860


Growth 2.00 41868

18 18 674072 0.67 22270 High 94 Sites - 1465 - 1.50 22576

19 19 845048 0.85 20901 High 90 Sites - 1844 - 1.50 26553

20 20 529214 0.53 18618 High 22 Sites - 885 - 1.50 14839

21 21 636378 0.64 22908 High 25 Sites - 1865 - 1.50 21926

22 22 512417 0.51 31714 Very High 57 Sites - 560 - 1.30 21185

23 23 718724 0.72 24367 High 55 Sites - 580 - 1.50 26329

24 24 471930 0.47 27981 Very High 64 Sites - - - 1.30 17226


Growth 2.00 21886

26 26 2070181 2.07 8179 Low 36 Sites - 1525 Future High 2.00 33923

70

S.No Ward

No


Pattern as

per 2011

Projected

Population

(Persons /

Sqkm)

Density

Type

(As per 2011

Projected

Population)


(As per Site Visit)

CDP

Observations

Population

Projection

Factor

Projected

Population

for the

Year 2044

(Ultimate


Vrtl

Exp

Slum

Population

Growth


Growth 1.70 22417

28 28 1295593 1.30 8866 Low 16 Sites High - Future High -

Growth 2.00 23033

29 29 397572 0.40 28784 Very High 8 Sites - 1000 - 1.30 14936

30 30 291218 0.29 36343 Very High 6 Sites High 1850 - 1.30 13818

31 31 676948 0.68 15033 High 12 Sites High - - 1.50 15324


33 33 771938 0.77 17525 High 33 Sites High 2142 - 1.50 20351


Growth 1.70 31061

35 35 359715 0.36 19634 High 11 Sites - 3693 - 1.50 10653

36 36 507942 0.51 24830 High 7 Sites - - - 1.50 18978

37 37 236663 0.24 34304 Very High 11 Sites - 2000 - 1.30 10613

38 38 344228 0.34 22591 High 4 Sites - 75 - 1.50 11724

39 39 342012 0.34 21297 High - - - 1.50 10985

40 40 141768 0.14 88072 Saturated 3 Sites - - - 1.20 15042

41 41 160978 0.16 57452 Saturated 4 Sites - - - 1.20 11158


Growth 1.70 24047

71

S.No Ward

No


Pattern as

per 2011

Projected

Population

(Persons /

Sqkm)

Density

Type

(As per 2011

Projected

Population)


(As per Site Visit)

CDP

Observations

Population

Projection

Factor

Projected

Population

for the

Year 2044

(Ultimate


Vrtl

Exp

Slum

Population

43 43 224191 0.22 61669 Saturated 26 Sites - 4505 - 1.20 16650

44 44 339790 0.34 47303 Saturated 4 Sites - - - 1.20 19347

45 45 271080 0.27 36860 Very High 8 Sites - - - 1.30 13049

46 46 96825 0.10 118448 Saturated 3 Sites - - - 1.20 13822

47 47 173715 0.17 66171 Saturated 5 Sites - - - 1.20 13853

48 48 122941 0.12 90986 Saturated 2 Sites - - - 1.20 13482

49 49 1005588 1.01 12079 Medium 39 Sites - - Normal

Growth 1.70 20707


Growth 1.70 11139

51 51 603842 0.60 17363 High 24 Sites - 315 - 1.50 15786

52 52 629791 0.63 22614 High 82 Sites - 885 - 1.50 21422

53 53 327236 0.33 47041 Saturated 16 Sites - - - 1.20 18531

54 54 4093116 4.09 7270 Low 696 Sites High 14160 Future High

Growth 2.00 59569

55 55 4420063 4.42 3338 Low 658 Sites (High

as per CDP) - 3775

Future High

Growth 2.00 29569

56 56 1023920 1.02 17221 High 354 Sites - 795 1.50 26509


Growth 2.00 33138

58 58 2222099 2.22 5740 Low 184 Sites (High - 1285 Future High 2.00 25567

72

S.No Ward

No


Pattern as

per 2011

Projected

Population

(Persons /

Sqkm)

Density

Type

(As per 2011

Projected

Population)


(As per Site Visit)

CDP

Observations

Population

Projection

Factor

Projected

Population

for the

Year 2044

(Ultimate


Vrtl

Exp

Slum

Population

as per CDP) Growth

59 59 1706017 1.71 9295 Low 566 Sites (High

as per CDP) - 605

Future High

Growth 2.00 31774

60 60 1251960 1.25 12132 Medium 87 Sites High 1000 Normal

Growth 1.70 25881

61 61 1006906 1.01 17127 High 118 Sites High 1250 - 1.50 25927

62 62 778318 0.78 15910 High 221 Sites High 1750 - 1.50 18634


64 64 534997 0.53 20991 High 14 Sites High 7100 - 1.50 16905


Growth 2.00 26693

66 66 1472190 1.47 16914 High 750 Sites - 4225 - 1.50 37411

67 67 305637 0.31 48134 Saturated 99 Sites - - - 1.20 17713

68 68 173771 0.17 37448 Very High 26 Sites - - - 1.30 8519

69 69 832388 0.83 28707 Very High 159 Sites - - - 1.30 31123


Growth 1.70 31446

71 71 573249 0.57 22073 High 87 Sites - 440 1.50 19039


Growth 2.00 73946

73

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

Po

pu

lati

on

(N

os

)

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Ward Number

CBE 24 X 7 - Wardwsie Population Projection (Ward - 1 to 20)

2044 Population

2029 Population

2014 Population

Fig. No. 12 - Ward Wise Population Projection (From 1 to 20 - Old Ward Numbers)

74

0

5000

10000

15000

20000

25000

30000

35000

Po

pu

lati

on

(N

os

)

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40

Ward Number


2044 Population

2029 Population

2014 Population

Fig. No. 13 - Ward Wise Population Projection (From 21 to 40 – Old Ward Numbers)

75

0

10000

20000

30000

40000

50000

60000P

op

ula

tio

n (

No

s)

41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

Ward Number


2044 Population

2029 Population

2014 Population

Fig. No. 14- Ward Wise Population Projection (From 41 to 60 – Old Ward Numbers)

76

0

10000

20000

30000

40000

50000

60000

70000

80000P

op

ula

tio

n (

No

s)

61 62 63 64 65 66 67 68 69 70 71 72

Ward Number


2044 Population

2029 Population

2014 Population

Fig. No. 15 - Ward Wise Population Projection (From 61 to 72 – Old Ward Numbers)

77

Table No. 2.10 shows the Ward wise ultimate projected population and their water demand.

Table No. 2.10 - Ward Wise Demand Calculation

S.No Ward Number

Projected Ward wise

Population for 2011

(With 2001 Ward Wise

Approved Population)

Population

Projection Factor

Projected Population for the

Year 2044 (Ultimate Stage)

2044 Population Demand

(lpcd)

(1) (2) (3) (4) (5) = (4) X (3) (6) = (5) X 135

1 1 15116 2.00 30292 4089417

2 2 15624 2.00 31307 4226419

3 3 15477 2.00 31013 4186704

4 4 21023 2.00 42105 5684184

5 5 16237 1.70 27663 3734444

6 6 16729 2.00 33517 4524745

7 7 16764 2.00 33587 4534289

8 8 12629 1.50 19003 2565463

9 9 20287 1.70 34548 4663966

10 10 19164 1.70 32639 4406201

11 11 17022 1.70 28996 3914487

12 12 14099 2.00 28258 3814797

13 13 17259 2.00 34577 4667905

14 14 13653 2.00 27366 3694419

15 15 15444 1.70 26313 3552309

16 16 24589 1.70 41860 5651059

17 17 20904 2.00 41868 5652165

18 18 15011 1.50 22576 3047819

19 19 17663 1.50 26553 3584667

20 20 9853 1.50 14839 2003215

78

S.No Ward Number

Projected Ward wise

Population for 2011



Population

Projection Factor




(lpcd)

21 21 14578 1.50 21926 2960076

22 22 16251 1.30 21185 2860034

23 23 17513 1.50 26329 3554419

24 24 13205 1.30 17226 2325526

25 25 10913 2.00 21886 2954608

26 26 16932 2.00 33923 4579546

27 27 13152 1.70 22417 3026313

28 28 11487 2.00 23033 3109466

29 29 11444 1.30 14936 2016347

30 30 10584 1.30 13818 1865460

31 31 10177 1.50 15324 2068792

32 32 10637 1.30 13888 1874866

33 33 13528 1.50 20351 2747414

34 34 18236 1.70 31061 4193186

35 35 7063 1.50 10653 1438197

36 36 12612 1.50 18978 2562000

37 37 8119 1.30 10613 1432810

38 38 7777 1.50 11724 1582742

39 39 7284 1.50 10985 1482992

40 40 12486 1.20 15042 2030695

41 41 9249 1.20 11158 1506269

42 42 14111 1.70 24047 3246393

43 43 13826 1.20 16650 2247743

44 44 16073 1.20 19347 2611830

79

S.No Ward Number

Projected Ward wise

Population for 2011



Population

Projection Factor




(lpcd)

45 45 9992 1.30 13049 1761600

46 46 11469 1.20 13822 1865923

47 47 11495 1.20 13853 1870171

48 48 11186 1.20 13482 1820112

49 49 12146 1.70 20707 2795502

50 50 6518 1.70 11139 1503803

51 51 10485 1.50 15786 2131135

52 52 14242 1.50 21422 2891959

53 53 15393 1.20 18531 2501736

54 54 29755 2.00 59569 8041852

55 55 14755 2.00 29569 3991822

56 56 17633 1.50 26509 3578663

57 57 16539 2.00 33138 4473639

58 58 12754 2.00 25567 3451510

59 59 15858 2.00 31774 4289532

60 60 15189 1.70 25881 3493952

61 61 17245 1.50 25927 3500157

62 62 12383 1.50 18634 2515588

63 63 12006 1.30 15667 2115004

64 64 11230 1.50 16905 2282146

65 65 13317 2.00 26693 3603598

66 66 24901 1.50 37411 5050436

67 67 14712 1.20 17713 2391272

68 68 6507 1.30 8519 1150047

80

S.No Ward Number

Projected Ward wise

Population for 2011



Population

Projection Factor




(lpcd)

69 69 23895 1.30 31123 4201609

70 70 18463 1.70 31446 4245262

71 71 12653 1.50 19039 2570312

72 72 36943 2.00 73946 9982665

TOTAL 1061447 Nos 1752203 Nos 172472348 lpcd



81

(iv) Topographical Survey

The topographic levels along the roads furnished by the Corporation is verified and adopted for the

design.

(v) Soil Investigation

The soil analysis database made under the proposed Under Ground Sewerage Scheme, received from

Corporation is validated and used for water supply project for estimation and as well as to suggest

bedding for pipe line to suit soil condition if required. The soil tests to arrive at SBC as per relevant

BIS for proposed new service reservoir sites have also been done. Under the scope of the DPR, Safe

Bearing Capacity was ascertained from the corporation and random sampling of SBC tests were

carried out on the following Proposed Service reservoirs at the rate of one SR for each Zone which is

listed in Table No. 2.11 for the construction of 29 SRs in Coimbatore.

Table No. 2.11 – SBC Test on Proposed SR Site (One SR / Zone)

S.No Service Reservoir Location Zone Capacity (LL)

1 Nehru Street North 18.00

2 Housing Unit West 18.00

3 Sivaram Nagar South 19.00

4 Kothari Nagar East / Demo Zone II 4.00

5 VOC Park East / Demo Zone I 18.00

There are a few incidents come to light where soil settlement phenomenon happened within the

Corporation area itself resulting in the failure of civil structures, settlement of houses, loss of

materials, etc. Keeping in consideration of the above real time factors, necessary safety measures are

adopted in structural design of all the Water Retaining Structures in this proposal. Accordingly,

suitable provisions are also in built in Cost Estimate for all the Water Retaining Structures under this

project in order to conduct and confirm the actual SBC Values, etc at the Proposed construction sites

and also to adopt the right foundation design based on suitable SBC values before taking up the work

for execution so as to serve its full design life time fruitfully.

The Corporation has to take necessary measures to ensure that all required site tests are conducted,

test results are analyzed and confirmed as per Technical Specification provided confirmed to IS

Standards for all the Water Retaining Structures, including the SBC Tests already conducted for the



82

above said Service Reservoirs before execution of the project. However, for the ease implementation

of the project, foundation is designed for the above said Service Reservoirs with the ascertained SBC

value from the field tests conducted which is annexed in Volume I (b), Annexure Number – A9

part of this DPR.

The details of site selected for validation are listed in Table No. 2.12, 2.13 & 2.14 repectively.

Location : Trial pit at Thanner pandal road

Ward No : 3

Date : 24.02.09

Table No. 2.12 – Soil Trial Pit at Thanner Pandal Road

Details received from Corporation Validation by Fichtner

Sl.No. Depth Soil Specimen Nature

1 0 to 1.00 mtr Clay soil Verified

2 1.00 to 2.00 mtr Loose Clay soil Verified

Location : Trial pit at Nava India Road (Avinasi road junction)

Ward No : 14

Date : 25.02.09

Table No. 2.13 – Soil Trial Pit at Nava India Road



1 0 to 1.00 mtr Red soil Hard soil

2 1.00 to 2.00 mtr Red soil Verified

3 2.00 to 3.00 mtr Red soil Verified



83

Location : Trial pit at South Street, Avarampalayam

Ward No : 17

Date : 25.02.09

Table No. 2.14 – Soil Trial Pit at Avarampalayam



1 0 to 1.00 mtr Clay soil Verified

2 1.00 to 2.00 mtr Clay soil Verified

Additionally the SBC value of the soil was determined by drilling 100mm diameter bore hole using

Rotary Calyx Mechanically Operated Drilling Equipment, to a depth of 10m below the local ground

level or upto the hard stratum with the “N” value over 100 or 34 blows for 10 cm penetration



84

whichever is encountered earlier. Additionally SPT test, laboratory test on soil samples collected

classification of soil, type and depth of foundation, etc., was deteremined.

(vi) Zoning of Distribution System

The capacity and serving area of a reservoir is primarily based on the population and its demand. The

contour of the area to be served is one of the prime considerations for demarcation of SR zones in the

project area. The contour plan prepared is considered for rezoning, which depends on the capacity of

the existing & proposed service reservoirs, terrain of the area, distance, location, vertical expansion,

new layouts, cluster to be served, etc. and the most economical design is arrived at. While rezoning,

necessity for providing additional service reservoir to meet additional requirement is analyzed and

provided. Zoning of the area in the proposed project area under jurisdiction of CCC, is carried out.

This has been performed based on the ultimate stage (year 2044) population. Each zone is provided

with an SR and further divided into multiple District Metering Areas (DMAs) for SRs of capacity

more than 10 LL. Following are the important criteria adopted in zoning of the project area for the

design of the distribution system.

(a) In any classified zone, the difference in the maximum and minimum elevations shall

not be more than 10m.

(b) The minimum residual head available shall be atleast 12 m (as specified in the Manual

on Water Supply of CPHEEO) for all proposed service reservoirs and a minimum of

7 m based on the constraints imposed by the staging height of existing SRs.

(c) Zone boundaries have been demarcated along the Contour lines of the project area.

(vii) Distribution System Network

Distribution System Network for each service reservoir is prepared taking into account of the factors

like length of distribution system, maximum serving area and physical constraints. Further, suitable

coverage of Slum settlements, spatial distribution of the settlements, type of service, etc., are also

considered for suitable rezoning.

(viii) Consumption Peak Factor

There is variation in water consumption during the day and the night and also varies with seasons.

There is no clearly defined relationship between average and peak flow currently applied to all towns.



85

The CPHEEO Manual on Water Supply and Treatment recommends the following peak factors for

various design population.

Population less than 50000 : 3.0

Population range of 50000 to 200,000 : 2.5

Population above 200,000 : 2.0

Hence, the relevant peak factor is adopted accordingly for each zone.

(ix) Minimum Residual Head

The CPHEEO Manual prescribes a minimum residual head of 12 m at ferrule points for two storey

building and the same is adopted for this project. However, as most of the existing SRs are old, based

on the existing staging height, a minimum residual head of 7 m is maintained for such zones

(x) Utility of Existing Pipes

The pressure distribution system with minimum 12 m pressure is proposed. The existing PVC Pipes

may not be suitable due to the factors of susceptibility to impact loading, vulnerable for damages by

other service agencies, temperature & non resistivity. The use of AC Pipes is also not in practice due

to heavy weight and hence the existing AC pipes also require replacement. The CI pipe laid long ago

served out their life and requires replacement. The piece meal extensions made using pipes less than

100 mm dia to meet immediate requirement temporarily also requires replacement.

(xi) Network Analysis for Looped Distribution System

Network mapping and modelling for detailed engineering design is the core activity that determines

the realisation of desired objectives under this assignment. A basic hydraulic model of the network

comprising of primary, secondary and tertiary mains is analysed, using an internationally recognized

network modelling software package, namely WATERGEMS & LOOP. Based on the model

simulations, the capacity of the network, identified engineering requirements for hydraulic zoning,

district metering, improving the flow characteristics, rehabilitation, replacement and expansion to

meet the demand projections so as to ensure a continuous pressurized water supply service is carried

out. Network drawings analysis results will be given to Coimbatore Corporation for its usage and

validation in future.



86

(xii) Elimination of Public Fountains

There is a percentage share of distribution of water through public fountains to serve the consumers

who are not having House Service Connections in their property. As 24 X 7 continuous water supply

system is proposed, the possibility of meeting each and every household property owner to avail HSC

will be emphasised by convincing the consumers with rational tariff structure and implementing slum

policy of government for urban poor. At present, there are 3412 nos of public fountains in the

Coimbatore Corporation area and suggestions will be made to reduce / eliminate the public fountains

to the extent possible through suitable IEC activities by the Corporation

(xiii) Pipe Material

Selection of Pipe Material

CPHEEO has laid down guidelines on the techno-economic comparison and selection the pipeline

material. The present selection is made based on these guidelines. Hazen William’s C value of 100 for

Existing CI pipes, 140 for DI and MS Pipes considered for design. DI pipes have an inherent high

tensile strength. Thus, high factor of safety to the pipeline against accidental waterhammer/ impact /

traffic loading on pipeline, accidental drop at site during laying / loading / unloading, etc. DI pipes

have a distinct advantage, namely, they come with internal cement mortar lining that is done at

factory, along with the external bitumen painting over a zinc coat. In an area like Coimbatore, which

is in the vicinity for high traffic, congestion, high rainfall, high temperature, etc it is better to provide

a pipeline which has inherent corrosion resistant and other featured properties. DI pipes protected

internally with centrifugally applied cement mortar lining are best suited to resist against corrosion.

Considering these factors, spigot and socket spun DI pipes lined internally with cement mortar and

externally with bitumen painting over zinc coat of Class K7 is selected as the pipe material for feeder

mains. The pipes shall be HDPE PN6-PE100 for size less than 200 mm for Gravity mains and

HDPEPN8-PE100 for pumping mains, DI K7 for pipes ranging from 200 – 600 mm and MS

(Minimum of 8 mm thickness) for pipes greater than 600 mm are considered.

Hazen William’s Roughness Coefficient

Hazen William’s Roughness Coefficient ‘C’ for transmission / feeder mains in the system is adopted

as per CPHEEO norms. Adequacy of the existing mains was verified by proper selection of C value

based on the pipe material and age as specified in the CPHEEO manual.



87

(xiv) Trench Size for Pipe Laying

Trenches for laying feeder mains and distribution mains in the system have been estimated based on

the standard guidelines specified in the CPHEEO Manual. A minimum pipe cover of 1.0 m from the

ground to the pipe crown shall be maintained for proper load distribution and pipeline safety

considerations. A minimum working space of 300 mm on either side of the pipe is considered as

working space for proper excavation.

(xv) Service Reservoirs

Based on the zoning of the distribution system, CCC is divided into four parts namely East, West,

North and South with a total number of 63 service reservoirs having 101 Sub Zones. The storage

capacity of each SR has been worked out for the intermediate stage based on 24 hours pumping and

24 hours supply, as per the CPHEEO guidelines. The capacities of SRs proposed are as follows:

4 Lakh Litres with 15 metres of Staging Height

7 Lakh Litres with 12 & 15 metres of Staging Height










The details of the proposed SRs – 29 Nos in the 101 Sub Zones with improratnt land marks covered

under each SR are presented in Volume – I (b), Annexure Number – A11 part of this DPR.

(xvi) House Service Connections

In order to cater to the population in the intermediate stage viz., for the project area where

augmentation proposals are made, the total number of HSCs are worked out for the Base year 2014

population and comes around 2.00 Lakhs Connections (Approximately). The present (2010) House

Service Connections are procured from the corporation and found to be 1,43,051 Nos. The same has



88

been adopted as base for the calculation and envisaged that additional 50,000 new connections would

be encountered, hence accordingly 1.5 Lkhs Connections has been taken in the DPR. Provision for

fixing new water meters are also made in the estimates.

As recommended by CPHEEO, New Delhi, 75,000 Nos of Water meters are provided with AMR and

the remaining meters shall be retained as they are in working condition. Provision was also made that

90% of total meters shall be for 15 mm Domestic Connection and 10% of total meters shall be for 25

mm Non-domestic Connection.

The details on HSC provided is listed below in Table No. 2.15 and the details of connection with the

Existing or New Connection was shown in Dwg No.10/1811150/WSS/WI/145 & 146, Volume VI

part of this DPR.

Table No. 2.15 – Number of House Service Connections (Base Year 2014)

Sl

No

Zone

2014 Pop

(Nos)

No of HSC

(Nos)

Service Connections

Domestic -

90%

Non Domestic

& PF - 10%

1 North Zone 2,66,732 36,015 32,414 3,602

2 South Zone 1,99,736 26,969 24,272 2,697

3 West Zone 3,19,611 43,154 38,839 4,315

4 East / Demo Zone - I 1,22,988 16,606 14,945 1,661

5 East / Demo Zone – II 2,01,866 27,256 24,530 2,726

Total 11,10,933 1,50,000 1,35,000 15,000

The cost for House Service Connections is worked out in Volume III –

Distribution System & Special Component part of this report and

comes around Rs 324.50 Crores (As per Schedule of Rates 2016 –

2017)

2.9.2 Field Investigations Done

The field studies were made for collection of additional data, measurement of flow, pressure

measurement and water sampling and testing etc., for design considerations. The details of the

particulars collected Zone wise are listed in Table No. 2.16.

Table No. 2.16 - Additional Data Collection Made

S.No Description Zone Numbers

East West North South

Data Collection Made Ward Numbers



89

1 Street Name Updation

4,5,6,7

8,9,10

11,14,15,

16,19,20

21,22, 23,

24,26

48,49,50

51 52,53

55,56,57

58,59,34

35,60,61

62,63,64

1,2,3,

17,65 66

67,68,69

70 ,71,72

18,29,30

31, 32, 33

36,37,38

41 42,43

44,45,46

47 54,12

13,25,27

39,40,28

2 SR Serving Area

3 Salient Features of Wards

4 Ward Boundary

5 Valve Details

6 Low Pressure Area

7 Leaks & Blocks

8 Existing WS Details

9 Unmarked Pipelines & New Roads

10 Potential SRs Site Particulars

11 Slum Details

12 Special Buildings

13 Bulk Water Supply Data

14 New Layouts / Vertical Expansions

Field Investigation Done

1 Flow Measurement

2 Pressure Measurement

3 Soil Investigation

4 Water Sampling and Testing

The bulk water requirement collected from various institutions, schools, commercial centers,

hotels, etc., are listed in Volume I (b), Annexure Number – A3 part of this DPR.

1. Flow Measurement

The flow measurements were made on both Siruvani and Pillur Water supply feeder mains using

portable ULTRASONIC FLOWMETERS – “FLEXIM” of German make for measuring the flow and

velocity in the piping system. The values are measured and stored for every minute in the Instrument

and these values are furnished separately in Voulme I (b), Annexure Number – A4 part of this

DPR and the flow measurement photographs taken at site were also annexed as photo gallery in

Annexure Number – A7, Volume I (b) part of this DPR.

2. Water Sampling and Testing

The water samples were collected randomly from Public Fountains in both Pillur and Siurvani water

supply system. The samples were tested in the Public Health Department lab, Coimbatore for

ascertaining the water quality on the Physical, Chemical and Bacteriological parameters. The copies

of the test reports are given in Table No. 2.17 & 2.18 and the photographs are enclosed in Volume I

(b), Annexure Number – A7, part of this DPR.

Table No. 2.17 - Water Sampling and Testing

Sample Number M291 M292 M293

Source Location PF at Nalamaraj Lane PF at RG Street PF at Rayappa



90

Sample Number M291 M292 M293

Nagar

Ward Number 38 41 18

Source Siruvani Supply Siruvani Supply Pillur Supply

Date of sampling 24.02.2009 24.02.2009 24.02.2009

PARAMETERS

PHYSICAL EXAMINATION

Appearance Slight Yellow (SP) Slight Yellow (SP) Colourless (SP)

Odour None None None

Turbidity NTU 3 2 2

CHEMICAL EXAMINATION

Total Dissolved Solids 40 85 120

Carbonate Hardness (As Caco3) 16 17 50

Non Carbonate Hardness (As

Caco3) 4 2 0

Total Hardness (Caco3) 20 19 50

Calcium Hardness (As Caco3) 11 7 32

Magnesium Hardness (As Caco3) 9 12 18

Chloride (As Cl) 7 7 28

Ammonium Nitrogen (as N) 0.01 0.02 0

Albuminoid Nitrogen (As N) - - -

Oxygen absorbed (Tidys test in 4

hrs) 0.12 0.16 0.08

Nitrate Nitrogen (As No2 mg/l) 0.2 0.2 0.2

Phenolpthalin Alkalinity (As

Caco3) 0 0 0

Methly Orange Alkalinity (As

Caco3) 16 17 50

Fluoride (as F) 0.1 0.1 0.1

pH value 7.1 6.8 7.2

Total Iron (As Fe) 0.5 0.4 0.1

Manganese (As Mn) 0 0 0

QUALITATIVE TESTS

Nitrite Nitrogen NIL NIL NIL

Sulphate Trace Trace Trace

Phosphate Trace Trace Trace

Toxic Substance - - -

Electrical Conductivity

(Reciprocal megohms per Cm at

20 C)

53 46 215

Microscopical Examination Amorphous Matter Amorphous Matter Amorphous

Matter

Table No. 2.18 - Water Sampling and Testing



91

Sample Number M294 M295

Source Location PF at Jothi Nagar PF at Rajiv Nagar

Ward Number 19 21

Source Pillur Pillur

Date of sampling 25.02.2009 25.02.2009

PARAMETERS

PHYSICAL EXAMINATION

Appearance Colourless (SP) Slight Yellow

Odour None None

Turbidity NTU 1 2

CHEMICAL EXAMINATION

Total Dissolved solids 65 30

Carbonate Hardness (As Caco3) 33 14

Non Carbonate Hardness (As Caco3) 1 5

Total Hardness (As Caco3) 34 19

Calcium Hardness (As Caco3) 20 7

Magnesium Hardness (As Caco3) 14 12

Chloride (As Cl) 6 6

Ammonium Nitrogen (as N) 0 0.01

Albuminoid Nitrogen (As N) - -

Oxygen absorbed (Tidys test in 4 hrs) 0.04 0.12

Nitrate Nitrogen (As No2 mg/l) 0.2 0.2

Phenolpthalin Alkalinity (As Caco3) 0 0

Methly Orange Alkalinity (As Caco3) 33 14

Fluoride (as F) 0.1 0.1

pH value 6.9 6.9

Total Iron (As Fe) 0.05 0.2

Manganese (As Mn) 0 0

QUALITATIVE TESTS

Nitrite Nitrogen NIL NIL

Sulphate Trace Trace

Phosphate Trace Trace

Toxic Substance - -

Electrical Conductivity (Reciprocal megohms per Cm

at 20 C) 93 50

Microscopical Examination Amorphous Matter Amorphous Matter

BACTERIOLOGICAL EXAMINATION

Plate Count per ml on agar at 37 deg C – 24 Hrs 70 0

MPN of Coliform bacteria / 100 ml 240 0

Nature of Coliform bacteria isolated Irregular VI -

The result of the sample collected from the Pit Tap at Jothi Nagar (Sample Number - M294),

Jayasimmapuram of Ward No 19 is not satisfactory for bacteriological quality. The pit taps will be

eliminated on providing continuous pressured system with a minimum residual head of 12m / 7m in

respective zones.



92

2.9.3 Detailed Engineering Design - Feeder Main System

As the entire distribution system and corresponding SRs are designed to meet the ultimate demand in

the year 2044, it is imperative that the feeder main system connecting all the SRs with the master

service reservoir (MSR) is also designed to cater to the ultimate demand. Design parameters

considered in the design of feeder mains is narrated below:

Design Parameters: The coefficient of roughness ‘C’ adopted in the design of feeder mains for the

existing pipes and proposed new pipes are listed in Table No. 2.19.

Table No. 2.19 - “C” Value used for Hydraulic Design

S.No Pipe Type System "C" Value for Pipes in Feeder Mains

Existing System Proposed System

1 PVC Siruvani - -

2 HDPE Siruvani - 145

3 DI & MS Siruvani - 140

4 CI Siruvani 100 -

5 AC Siruvani - -

6 PSC Siruvani - -

7 PVC Pillur - -

8 HDPE Pillur - 145

9 DI & MS Pillur - 140

10 CI Pillur 100 -

11 AC Pillur - -

12 PSC Pillur - -

The feeder / gravity mains are designed with 22 hours of flow.

With a view to minimize the cost for pipe material, old CI pipes satisfying the hydraulic

criteria are proposed for retention, removing all AC,PSC and PVC pipes. The details of pipe

sizes adopted are listed below in Table No. 2.20

Table No. 2.20 - Pipe Sizes Proposed in Feeder Mains

S.No. Pipe material &

Pressure Rating

Diameter in mm

(ID – for DI & MS

and OD for HDPE)

Type

1 HDPE – PE 100 PN 6 < 200 Gravity System

2 HDPE – PE 100 PN 8 < 200 Pumping System

3 DI-K7 S/S 200 - 600 Gravity / Pumping System

4 MS PIPES > 600 Gravity / Pumping System

.



93

In order to ensure designed flow to all SRs simultaneously, flow control valves are

proposed at the inlet of some SRs where the residual head available is extremely high

(Say > 7m pressure) and to stablize a uniform flow within the feeder mains.

As some SRs cannot be fed under gravity from MSR due to prevailing higher

elevations, ground level sumps are proposed nearby with required pumpsets, for

feeding them.

Ground level sumps proposed are designed for a retention time of 30 minutes (of the

intermediate stage requirement) for system which operates only during emergency

contingencies and for a retention time of 60 minutes (of the intermediate stage

requirement) for system which operates under routine / normal operation.

(i) Existing Feeder Main System

Details of existing feeder main arrangement and the Service reservoirs being fed under both Pillur and

Siruvani schemes are given below in Table No. 2.21 & Table No.2.22

Table No. 2.21 – Existing Feeder Mains under Pillur System

S.No From To Diameter Material Length Feeding Reservoir

1 NP-1 NP-2 1000 PSC 835 -

2 NP-2 NP-3 1000 PSC 1753 -

3 NP-3 NP-4 1000 PSC 178 -

4 NP-4 NP-5 1000 PSC 638 -

5 NP-5 NP-6 800 PSC 1543 -

6 NP-6 NP-7 800 PSC 932 -

7 NP-7 NP-8 750 AC 689 -

8 NP-8 NP-9 500 AC 296 -

9 NP-9 NP-10 450 AC 954 -

10 NP-10 NP-11 450 CI 1545 -

11 NP-11 NP-12 400 CI 1063 Puliyakulam

12 NP-12 NP-13 900 PVC 459 -

13 NP-10 NP-14 450 CI 1145 Town Hall

14 NP-2 NP-15 350 CI 1462 VV Nagar

15 NP-15 NP-16 450 CI 1581 Police Quarters

16 NP-16 NP-17 450 CI 921 Gandhi Ma Nagar

17 NP-2 NP-17 200 AC 5671 -

18 NP-17 NP-18 450 CI 5096 -

19 NP-18 NP-19 350 CI 948 -

20 NP-19 NP-20 350 CI 1240 -

21 NP-20 NP-21 350 CI 326 Singanallur

22 NP-21 - 200 AC - -

23 NP-22 NP-23 350 CI 1404 Anna Nagar



94


24 NP-23 NP-24 300 CI 1509 -

25 NP-24 NP-25 150 AC 771 SIHS Colony

26 NP-24 NP-26 300 CI 366 Nethajipuram

27 NP-18 NP-27 300 CI 2146 KK Nagar

28 NP-4 NP-28 500 CI 1507 Avarampalayam

29 NP-28 NP-29 500 CI 320 -

30 NP-28 NP-30 500 CI 144 -

31 NP-30 NP-31 500 CI 101 Kamadehnu Nagar

32 NP-31 NP-32 500 CI 512 -

33 NP-32 NP-33 250 AC 1655 Peelamedu

34 NP-33 NP-34 450 AC 1185 -

35 NP-34 NP-35 450 PSC 1356 Sowripalayam

36 NP-35 NP-36 350 PSC 2251 -

37 NP-36 NP-37 350 PSC 419 GV Residency

38 NP-36 NP-19 250 CI 1298 Varadarajapuram

39 NP-6 NP-38 750 CI 666 Siddhapudur

40 NP-39 NP-40 200 AC 2829 Maniyakarampalayam

41 NP-40 NP-41 450 CI 1620 -

42 NP-41 NP-42 450 CI 220 Kamarajapuram

43 NP-41 NP-43 450 CI 60 -

44 NP-43 NP-44 450 CI 209 -

45 NP-44 NP-3 450 CI 530 -

Table No. 2.22 – Existing Feeder Mains under Siruvani System


1 NS-1 NS-2 500 CI 1119

2 NS-2 NS-3 450 CI 1668

3 NS-3 NS-4 600 CI 1210

4 NS-4 NS-5 250 CI 1083 Cheran Nagar

5 NS-4 NS-6 600 CI 2233 Jayaram Nagar

6 NS-3 NS-7 450 CI 1216 Gandhi Park, DB Road

7 NS-7 NS-8 600 CI 1432 Vysia Street

8 NS-1 NS-9 450 CI 1548 RS Puram,

9 NS-1 NS-10 600 CI 1366 Sanganur Chinthamani

10 NS-1 NS-11 600 CI 1183

11 NS-11 NS-12 500 CI 1426

12 NS-12 NS-13 500 CI 234

13 NS-13 NS-14 500 CI 290 RG Nagar

14 NS-13 NS-15 500 CI 1966 Rayappa Nagar

15 NS-12 NS-16 250 AC 1554 Jai Nagar

16 NS-1 NS-17 250 CI 554



95


17 NS-1 NS-18 500 CI 1651

18 NS-18 NS-19 250 CI 522 Tatabad

19 NS-18 NS-20 500 CI 1998 VOC Park

20 NS-20 NS-21 150 CI 2560

The details of the existing feeder main system are presented in Dwg No. 10/1811150/WSS/WIN/005,

Volume VI part of this DPR.

(ii) Existing Problems in Feeder Main Systems

1. No Bulk water meter is installed either in MSRs or in SRs. This resulted in ineffective

monitoring of flow among MSRs to SRs and designed quantity is not received at various SRs.

2. Direct tapping in Feeder Mains between MSR to SRs was observed. This resulted in reduction

of residual pressure available at the feeder mains to feed the SR’s due to which SRs are not

receiving designed flow. Many SRs like Jai Nagar SR, Sanganur Chintamani SR, etc., are not

used due to insufficient flow in the reservoir.

3. Interlinking of Distribution System under both schemes like Pillur and Siruvani was observed

near the Sungam areas, to overcome the shortage problem occurring during the Siruvani

schemes.

4. Also distribution network were linked with two SRs at a time to feed remote areas, the area of

higher elevation as observed in the Southern Part of Coimbatore in Ward 54, which is

supplied by both Gandhi Park SR and also by Bharathi Park GLSR. This will greatly affect

the network hydraulics by causing higher flow than the designed quantity into the system and

affects the efficiency of the system like the pipe joints getting weaker (cement solvent as in

the present case), prone to more leakage, etc.,

5. Direct Feeding arrangement to SRs from rising mains namely in Revathi Layout SR,

Venkatapuram SR, Madatur SR, Ishwarya Nagar SR, etc in West Zone was also observed in

between Siruvani WTP to Siruvani MSR. These arrangements affect the regular water supply

schedule of Siruvani fed areas, especially during the shortage period.

6. There is no proper feeder main arrangement with the dependable source in the existing system

to overcome the shortage in Siruvani Supply.

7. Due to insuffiecient pressure in the feeder main to feed the SR’s, many places pumpsets are

used to directly pump into the Distribution system. Also due to frequent power failure or

power shutdown, pumps are operated using Diesel or in case of non availability of such

arrangments, the supply to the zone is affected considerably.



96

(iii) Proposed Feeder Main System

1. The existing feeder main alignment was retained as such, so as to avoid any additional / New

Railway Crossings, National Highway Crossings, Nallas, Water Streams etc., which may

delay the laying of pipes during execution time. The entire alignment was revamped for the

ultimate demand in 2044 and the existing CI pipes suitable for hydraulic designs are retained.

Additionally new feeder mains are proposed to the newly proposed SRs in both the systems.

2. Isolation of Pillur and Siruvani System are made separately, with Pillur System having it

supply from Pillur MSR and Siruvani system from Siruvani MSR respectively. The railway

line running parallel to the Mettupalayam Highway starting from ward 64 at Northern end and

ending at Ward 13 near Trichy Pallaghat road forms the boundary for Siruvani and Pillur

Systems

3. The Pillur feeder main was further sub divided into two primary stretches, linking a group of

Service reservoirs from Existing and Proposed MSR at Ramakrishnapuram separately.

4. In the proposed Feeder mains system, both Pillur & Siruvani MSRs are used only as

balancing reservoirs and the existing distribution system are delinked from the system.

5. Special apputenences like Sluice Valves with actuators connected to SCADA system are

proposed at the Inlet of each SR, Pitless sluice valves along the branch mains for flow

regulation and control during O & M. DI Scour Valves are proposed closure to Nallah or

water stream along the alignment for scouring. Duojet cylindrical air valves are proposed in

the higher / elevated gorund levels in between each stretches. Flow regulating valves are

proposed where the residual head at the SR Inlet was very high (> 7 m). Bulk water meters

with flow measurement are proposed at the outlet of each SR connecting to each District

Metering Area (DMA’s), to quantify the flow to distribution system.

6. In case of Direct Feeding SR’s – As an emergency contingency for the Direct Feeding SRs

under Siruvani system during drought periods, a separate pumping arrangement has been

made from the proposed sump of 10 LL capacity with the retention time of 60 minutes at the

existing Sanganur Chinthamani SR area, extending upto Revathy Layout along the pheriperal

boundary of Coimbatore Corporation connecting the other 5 direct feeding SRs. The size of

the pumping mains is arrived based on the economical analysis taking in to account the cost

of pipes, pumpsets and energy charges.

Alternate options like

Connecting Six SRs from Siruvani MSR separately by laying a

separate line was also considered. But due to high elevation difference



97

(ie) the SRs being located in the higher elevation it cannot be fed by

gravity system.

Connecting Six SRs to a proposed single Service Reservoir, acting like

a balancing reservoir at higher elevation (Probably in Ward 61) to

feed the six reservoirs is also considered. But due to the

nonavailability of apt site and also additional cost is incurred for

construction of balancing reservoir, so this alternative is also ruled

out

Details of the propsed feeder main system and their longitudinal section for a chainage of every 30 m

is shown in Dwg No. 10/1811150/WSS/WIN/007, Volume VI part of this DPR.

(iv) Proposed Feeder Main Alignment

The total length of feeder mains coming under Pillur, Siruvani & Pillur Siruvani MSR comes around

105 Kms. Pillur comprises of 64 Kms of main under Gravity and 10 Kms of main under Pumping.

Siruvani comprises of 15 Kms of main under Gravity and 7.50 Kms of main under Pumping. Pillur

Siruvani MSR Interlinking comprises of 8.50 kms of main under gravity.

Details of Service Reservoirs under each system and also the proposed feeder main system being fed

under Pillur and Siruvani system are listed in Table No. 2.23 to 2.29 and shown in Dwg No.

10/1811150/WSS/WIN/ 007 to 032, Volume VI part of this DPR.

98

Table No. 2.23 - Pillur Feeder Main I

From Proposed MSR at Ramakrishnapuram to Proposed SR at Bharathi Nagar (By Gravity) S

tretc

h

Len

gth

(m)

Inte

rmed

i

ate

Flo

w

(m)

Ult

ima

te

Flo

w (

m)

Dia

met

er

(mm

)

Pip

e

Ma

teria

l

Rem

ark

s

No

de

No

G.L

(m

)

Sta

gin

g

Hei

gh

t

(M)

LW

L

(m)

Dep

th O

f

Wa

ter (

m)

MW

L (

m)

Pip

e

Ou

tlet

Lev

el (

m)

Ca

pa

city

(LL

)

SR

Na

me

1 - 2 1500 742.91 948.17 1250 MS

(10mm THK) - 2 428.13 - - - - - - -

2 - 3 1000 733.45 936.3 1250 MS

(10mm THK) - 3 422.5 - - - - - - -

3 - 4 700 665.12 850.48 1200 MS

(10mm THK) - 4 417.86 - - - - - - -

4 - 5 2300 632.81 809.9 900 MS

(8mm THK) - 5 411.41 - - - - - - -

5 - IT 1000 34.72 34.72 - - - - - - - - - - Tapping for

ITPark

5 - 6 500 598.09 775.18 700 MS

(7mm THK) - 6 410.51 - - - - - - -

6 - 7 275 560.72 724.55 700 MS

(7mm THK) - 7 407.33 - - - - - - -

7 - 8 123 523.88 678.29 700 MS

(7mm THK) - 8 406.47 - - - - - - -

8 - 9 1423 474.43 616.19 700 MS

(7mm THK) - 9 396.07 - - - - - - -

9 - 10 564 441.52 574.86 700 MS

(7mm THK) - 10 393.99 - - - - - - -

10 - 11 1377 136.33 177.46 500 DI K7 S/S - 11 388.41 - - - - - - -

11 - 12 1532 85.36 113.45 500 DI K7 S/S - 12 387.38 - - - - - - -

12 - 13 956 47.8 66.28 400 DI K7 S/S - 13 399.33 - - - - - - -

13 - 14 225 39.81 56.26 400 DI K7 S/S - 14 400.61 15.00 415.61 3.50 419.11 421.61 11.00

Bharathi

Nagar SR

(Proposed)

PILLUR - BRANCHES FOR FEEDER MAIN-I

99



tretc

h

Len

gth

(m)

Inte

rmed

i

ate

Flo

w

(m)

Ult

ima

te

Flo

w (

m)

Dia

met

er

(mm

)

Pip

e

Ma

teria

l

Rem

ark

s

No

de

No

G.L

(m

)

Sta

gin

g

Hei

gh

t

(M)

LW

L

(m)

Dep

th O

f

Wa

ter (

m)

MW

L (

m)

Pip

e

Ou

tlet

Lev

el (

m)

Ca

pa

city

(LL

)

SR

Na

me

2 - 15 100 9.46 11.88 200 DI K7 S/S - 15 428.13 10.60 438.73 3.00 441.73 442.73 3.00

Gandhi

Managar SR

(Exting)

3 - 16 947 68.33 85.82 500 DI K7 S/S - 16 422.50 15.00 437.50 3.70 441.00 442.20 8.00

VKR Nagar

SR

(Proposed)

4 - 17 370 32.31 40.58 350 DI K7 S/S - 17 417.70 15.00 432.70 3.10 435.80 438.30 10.00

Karuppiya

Goundar SR

(Proposed)

6 - 18 1116 37.37 50.83 400 CI EXIST

ING 18 405.80 - - - - - - -

18 - 19 853 37.37 50.63 250 DI K7 S/S - 19 401.42 15.00 416.42 3.50 419.92 422.42 10

Hudco

Colony SR

(Proposed)

7 - 20 51 36.84 46.26 200 DI K7 S/S - 20 406.29 14.00 420.29 3.50 423.79 426.29 10.00 DJ Nagar SR

(Existing)

8 - 21 276 49.45 62.10 250 DI K7 S/S - 21 406.26 12.00 418.26 3.20 421.462 423.962 13.00

Rajalakshmi

Nagar SR

(Proposed)

9 - 22 1330 32.91 41.33 300 DI K7 S/S - 22 396.28 - - - - - - -

22 - 23 955 32.91 41.33 300 DI K7 S/S - 23 399.03 13.00 412.03 3.50 415.53 418.03 10.00 KK Nagar SR

(Existing)

10 - 24 378 305.19 397.39 700 MS

(7mm THK) - 24 390.87 - - - - - - -

24 - 25 507 173.89 232.5 500 MS

(7mm THK) - 25 388.07 - - - - - - -

25 - 26 236 173.89 232.5 400 MS

(7mm THK) - 26 387.32 - - - - - - -

100



tretc

h

Len

gth

(m)

Inte

rmed

i

ate

Flo

w

(m)

Ult

ima

te

Flo

w (

m)

Dia

met

er

(mm

)

Pip

e

Ma

teria

l

Rem

ark

s

No

de

No

G.L

(m

)

Sta

gin

g

Hei

gh

t

(M)

LW

L

(m)

Dep

th O

f

Wa

ter (

m)

MW

L (

m)

Pip

e

Ou

tlet

Lev

el (

m)

Ca

pa

city

(LL

)

SR

Na

me

26 - 27 497 80.37 103.86 300 MS

(7mm THK) - 27 387.12 - - - - - - -

27 - 28 981 55.16 72.2 250 MS

(7mm THK) - 28 381.77 - - - - - - -

28 - 29 1334 40.58 53.89 250 MS

(7mm THK) - 29 379.29 - - - - - - -

29 - 30 771 40.58 53.89 250 MS

(7mm THK) - 30 376.94 15.00 391.94 3.50 395.45 397.946 11.00

Tagore Nagar

SR

(Proposed)

24 - 31 1298 131.29 164.9 450 MS

(7mm THK) - 31 392.61 - - - - - - -

31 - 32 777 114.88 144.28 450 MS

(7mm THK) - 32 393.37 - - - - - - -

32 - 33 2231 40.63 51.03 450 MS

(7mm THK) - 33 400.69 15.00 415.69 3.50 419.19 421.69 11.00

Sri Lakshmi

Nagar SR

(Proposed)

31 - 34 419 16.42 20.62 200 MS

(7mm THK) - 34 395.65 14.00 409.65 3.50 413.15 415.65 6.00

GV

Residency SR

(Existing)

32 - 35 163 74.25 93.25 250 MS

(7mm THK) - 35 394.69 15.00 410.59 4.00 414.59 417.09 20.00

Annai

Velankanni

SR

(Proposed)

26 - 36 650 93.52 128.64 350 MS

(7mm THK) - 36 387.97 - - - - - - -

36 - 37 1996 58.19 79.51 300 MS

(7mm THK) - 37 393.00 15.00 408.00 3.10 411.10 413.60 16.00

Thiru Nagar

SR

(Proposed)

101



tretc

h

Len

gth

(m)

Inte

rmed

i

ate

Flo

w

(m)

Ult

ima

te

Flo

w (

m)

Dia

met

er

(mm

)

Pip

e

Ma

teria

l

Rem

ark

s

No

de

No

G.L

(m

)

Sta

gin

g

Hei

gh

t

(M)

LW

L

(m)

Dep

th O

f

Wa

ter (

m)

MW

L (

m)

Pip

e

Ou

tlet

Lev

el (

m)

Ca

pa

city

(LL

)

SR

Na

me

36 - 38 255 35.33 49.13 200 MS

(7mm THK) - 38 388.19 15.00 403.19 3.50 406.69 409.19 10.00

Uppilipalaya

m

SR ( Existing)

27 - 39 326 25.21 31.66 200 MS

(7mm THK) - 39 388.90 8.35 397.25 3.00 400.25 402.75 7.00

Singanallur

SR (Existing)

28 - 40 375 14.58 18.31 200 MS

(7mm THK) - 40 380.69 15.00 395.69 3.50 399.19 401.69 4.00

Kothari Nagar

SR

(Proposed)

11 - 41 35 50.97 64.01 250 CI EXIST

ING 41 389.11 15.00 404.11 3.50 407.61 410.11 16.00

Anna Nagar

SR (Existing)

12 - 42 185 37.56 47.17 200 DI K7 S/S - 42 387.49 12.00 399.491 3.65 403.141 405.641 12.00 Nethajipuram

SR (Existing)

13 - 43 313 7.98 10.03 200 DI K7 S/S - 43 399.44 12.00 411.44 4.21 415.65 418.15 3.00 SIHS Colony

(Existing)

102

Table No. 2.24 - Pillur Feeder Main II

(From Existing MSR at Ramakrishnapuram to Proposed SR at Lakshmi Nagar Mill Colony (By Gravity)

Str

etch

Len

gth

(m

)

Inte

rmed

ia

te F

low

(Lp

s)

Ult

ima

te

Flo

w (

Lp

s)

Dia

met

er

(mm

)

Pip

e

Ma

teria

l

Pip

e

Rem

ark

s

No

de

Nu

mb

er

Gl

(m)

Sta

gin

g

Hei

gh

t (m

)

LW

L (

m)

Dep

th O

f

Wa

ter (

m)

MW

L (

m)

Pip

e O

utl

et

Lev

el (

m)

Ca

pa

city

(LL

)

SR

Na

me

(Ex

t/P

ro

)

1 - 2 901 922.94 1174.89 1400 MS

(12 mm THICK) - 2 421.05 - - - - - - -

2 - 3 1749 922.94 1174.89 1400 MS

(12 mm THICK) - 3 416.88 - - - - - - -

3 - 4 182 865.88 1098.97 1400 MS

(12 mm THICK) - 4 415.93 - - - - - - -

4 - 5 459 777.82 982.55 1400 MS

(12 mm THICK) - 5 415.18 - - - - - - -

5 - 6 1172 777.82 982.55 1400 MS

(12 mm THICK) - 6 417.52 - - - - - - -

6 - 7 524 705.48 891.7 1400 MS

(12 mm THICK) - 7 424.67 - - - - - - -

7 - 8 22 615.28 778.42 1400 MS

(12 mm THICK) - 8 424.65 - - - - - - -

8 - 9 330 560.07 706.92 1400 MS

(12 mm THICK) - 9 427.53 - - - - - - -

9 - 10 429 560.07 706.92 1400 MS

(12 mm THICK) - 10 423.97 - - - - - - -

10 - 11 1383 402.59 505.62 700 MS (7 mm

THICKNESS) - 11 414.33 - - - - - - -

11 - 12 740 402.59 505.62 700 MS (7 mm

THICKNESS) - 12 407.48 - - - - - - -

12 - 14 1165 201.87 253.53 500 DI K7 S/S - 14 407.55 - - - - - - -

14 - 15 730 131.8 165.52 500 DI K7 S/S - 15 407.09 - - - - - - -

15 - 16 1005 108.49 136.25 400 DI K7 S/S - 16 405.43 - - - - - - -

16 - 17 897 30.92 38.83 300 DI K7 S/S - 17 405.43 - - - - - - -

103



Str

etch

Len

gth

(m

)

Inte

rmed

ia

te F

low

(Lp

s)

Ult

ima

te

Flo

w (

Lp

s)

Dia

met

er

(mm

)

Pip

e

Ma

teria

l

Pip

e

Rem

ark

s

No

de

Nu

mb

er

Gl

(m)

Sta

gin

g

Hei

gh

t (m

)

LW

L (

m)

Dep

th O

f

Wa

ter (

m)

MW

L (

m)

Pip

e O

utl

et

Lev

el (

m)

Ca

pa

city

(LL

)

SR

Na

me

(Ex

t/P

ro

)

17 - 18 304 30.92 38.83 300 DI K7 S/S - 18 408.32 12.00 420.32 3.10 423.42 425.92 9.00 Lakshmi Nagar Mill

Colony SR (PRO)

PILLUR - BRANCHES FOR FEEDER MAIN - II

3 - 19 530 57.06 75.92 400 DI K7 S/S - 19 418.17 - - - - - - -

19 - 20 60 17.37 21.82 350 DI K7 S/S - 20 418.64 - - - - - - -

20 - 21 240 17.37 21.82 300 DI K7 S/S - 21 419.90 12.60 432.50 3.00 435.50 437.50 6.00 Kamarajapuram SR

(EXT)

19 - 22 206 39.69 54.1 350 DI K7 S/S - 22 418.50 13.90 432.40 3.50 435.90 438.40 15.00 Rayappa Nagar SR

(EXT)

4 - 23 1493 88.06 116.42 500 CI EXIS

TING 23 409.30 - - - - - - -

23 - 24 144 80.88 106.69 500 CI EXIS

TING 24 409.23 - - - - - - -

24 - 25 1405 72.1 94.82 400 DI K7 S/S - 25 408.28 - - - - - - -

25 - 26 426 46.07 62.13 350 DI K7 S/S - 26 412.92 - - - - - - -

26 - 27 234 46.07 62.13 200 DI K7 S/S - 27 413.99 10.50 424.49 4.01 428.50 431.00 15.00 Peelamedu SR (EXT)

23 - 28 320 7.18 9.73 200 DI K7 S/S - 28 409.30 13.30 422.60 2.50 425.10 427.52 2.50 Avarampalayam SR

(EXT)

24 - 29 101 8.77 11.87 200 DI K7 S/S - 29 409.48 11.40 420.88 3.01 423.89 426.39 3.00 Kamadhenu Nagar SR

(EXT)

25 - 30 713 26.03 32.69 350 DI K7 S/S - 30 411.82 15.00 426.82 3.50 430.32 432.82 7.00 PRP Garden SR (PRO)

6 - 31 1141 72.34 90.85 350 DI K7 S/S - 31 408.86 - - - - - - -

31 - 32 213 72.34 90.85 350 DI K7 S/S - 32 411.86 15.00 426.86 4.00 430.86 433.36 20.00 Ponni Nagar SR (PRO)

104



Str

etch

Len

gth

(m

)

Inte

rmed

ia

te F

low

(Lp

s)

Ult

ima

te

Flo

w (

Lp

s)

Dia

met

er

(mm

)

Pip

e

Ma

teria

l

Pip

e

Rem

ark

s

No

de

Nu

mb

er

Gl

(m)

Sta

gin

g

Hei

gh

t (m

)

LW

L (

m)

Dep

th O

f

Wa

ter (

m)

MW

L (

m)

Pip

e O

utl

et

Lev

el (

m)

Ca

pa

city

(LL

)

SR

Na

me

(Ex

t/P

ro

)

7 - 33 1123 90.21 113.29 600 DI K7 S/S - 33 427.14 - - - - - - -

33 - 34 250 90.21 113.29 600 DI K7 S/S - 34 427.14 - - - - - - -

34 - 35 133 90.21 113.29 600 DI K7 S/S - 35 426.00 8.80 434.80 3.20 438.00 440.50 28.00 Tatabad SR (EXT)

8 - 36 138 55.21 71.5 750 CI EXIS

TING 36 425.45 - - - - - - -

36 - 37 527 55.21 71.5 750 CI EXIS

TING 37 423.50 10.10 433.60 3.00 436.60 439.10 20.00 Siddhapudur SR (EXT)

10 - 38 245 157.48 201.3 600 DI K7 S/S - 38 423.98 - - - - - - -

38 - 39 42 91.89 115.4 600 DI K7 S/S - 39 423.98 12.80 436.78 3.00 439.78 440.78 27.00 VOC Park-Existing SR

38 - 40 172 65.59 85.9 600 DI K7 S/S - 40 423.98 12.00 435.98 3.70 439.68 440.68 18.00 VOC Park-Proposed

SR

12 - 41 1135 200.72 252.09 450 DI K7 S/S - 41 409.83 - - - - - - -

41 - 42 65 42.15 52.93 450 DI K7 S/S - 42 410.15 15.00 425.15 2.90 428.05 430.55 12.00 Clock Tower SR

(PRO)

13 - 43 100 58.05 72.91 450 DI K7 S/S - 43 409.00 13.60 422.60 4.20 426.80 429.30 16.00 TownHall SR (EXT)

47 - 44 593 14.26 17.91 250 DI K7 S/S - 44 402.09 15.00 417.09 3.50 420.59 423.09 4.00 JK Garden SR (PRO)

14 - 45 428 70.07 88.01 250 DI K7 S/S - 45 400.53 15.00 415.53 3.90 419.43 421.93 19.00 Sivaram Nagar SR

(EXT)

16 - 46 55 77.57 97.42 250 DI K7 S/S - 46 405.00 10.80 415.80 4.20 420.00 422.50 24.00 Puliyakulam SR

(EXT)

13 - 47 1079 71.84 90.23 350 DI K7 S/S - 47 407.31 - - - - - - -

47 - 48 71 57.58 72.32 300 DI K7 S/S - 48 402.09 15.00 417.09 3.10 420.19 422.69 16.00 BSUP SR (PRO)

15 - 49 1438 23.31 29.27 200 DI K7 S/S - 49 394.51 12.00 406.51 3.50 410.01 412.51 7.00 Valliammai Nagar SR

105



Str

etch

Len

gth

(m

)

Inte

rmed

ia

te F

low

(Lp

s)

Ult

ima

te

Flo

w (

Lp

s)

Dia

met

er

(mm

)

Pip

e

Ma

teria

l

Pip

e

Rem

ark

s

No

de

Nu

mb

er

Gl

(m)

Sta

gin

g

Hei

gh

t (m

)

LW

L (

m)

Dep

th O

f

Wa

ter (

m)

MW

L (

m)

Pip

e O

utl

et

Lev

el (

m)

Ca

pa

city

(LL

)

SR

Na

me

(Ex

t/P

ro

)

(PRO)

1 - 50 30 72.9 91.56 450 DI K7 S/S - 50 428.86 12.00 440.86 4.00 444.86 443.36

* 20.00

Ramakrishnapuram SR

* (PRO)

13 - 51 1360 28.68 36.02 450 DI K7 S/S - 51 409.45 13.60 423.05 3.75 426.80 429.30 9.00 Vysia Street SR (EXT)

41 - 13 204 158.58 199.16 450 CI EXIS

TING 13 412.30 - - - - - - -

* Pipe Outlet at Proposed SR at Ramakrishnapuram is connected below the MWL to get its supply from Existing MSR at Ramakrishnapuram to suit

gravity supply & thereby to avoid Sump cum Pumping arrangements

2.28 - Pillur Feeder Main III istirishnapuram to Proposed Sump at Rakatchi Garden (By Gravity)ble No 2.28 - Pillur Feeder Main III - From Existing MSR at

Ramakrishnapuram to Proposed Sump at Rakatchi Garden (By Gravity)

Table No. 2.25 - Pillur Feeder Main III

From Existing MSR at Ramakrishnapuram to Proposed Sump at Rakatchi Garden (By Gravity)

Stretch Length

(m)

Intermediate

Flow (Lps)

Ultimate

Flow

(Lps)

Diameter

(mm)

Pipe

Material

Pipe

Remarks

Node

Number

GL

(m)

LWL

(m)

MWL

(m)

Depth of

Water

(m)

Capacity

(LL)

Sr Name

(Ext/Pro)

1 - 2 1540 255.30 322.34 450 DI K7 - 2 423.00 - - -

2 - 3 831 255.30 322.34 450 DI K7 - 3 423.65 419.65 423.65 4.00 10.00

Prop Sump at

Rakatchi

Garden

106

Table No. 2.26 - Pillur Feeder Main IV

Pumping from Proposed Sump at Rakatchi Garden to Existing SR at Jai Nagar (By Pumping) S

tret

ch

Len

gth

(M

)

Inte

rmed

iate

Flo

w (

Lp

s)

Ult

ima

te

Flo

w (

Lp

s)

Dia

met

er

(Mm

)

Pip

e

Ma

teria

l

Pip

e

Rem

ark

s

No

de

Nu

mb

er

GL

(M

)

Sta

gin

g

Hei

gh

t (M

)

LW

L (

M)

Dep

th O

f

Wa

ter

(M)

MW

L (

M)

Pip

e O

utl

et

Lev

el (

M)

Sta

gin

g

Hei

gh

t (M

)

Ca

pa

city

(LL

)

SR

Na

me

(Ex

t/P

ro

)

1 - 2 1673 180.56 228.47 500 DI K7 S/S - 2 428.79 - - - - - - - -

2 - 3 1083 64.24 80.67 400 DI K7 S/S - 3 435.89 - - - - - - - -

3 - 4 143 48.05 60.34 350 DI K7 S/S - 4 434.87 - - - - - - - -

4 - 5 80 48.05 60.34 350 DI K7 S/S - 5 436.30 19.90 456.20 4.00 460.20 462.70 19.90 10.00 Jai Nagar

SR (Ext)

PILLUR - BRANCHES FOR FEEDERMAIN - IV

2 - 6 610 116.32 147.8 350 DI K7 S/S - 6 427.23 - - - - - - - -

6 - 7 1717 83.74 106.88 300 DI K7 S/S - 7 421.39 - - - - - - - -

7 - 8 645 66.96 84.1 250 DI K7 S/S - 8 421.16 15.00 436.16 3.70 439.857 442.36 15.00 20.00 Nehru Street

SR (Pro)

3 - 11 1950 16.19 20.33 180 HDPE PN

8 - 11 428.34 15.3 443.64 3.00 446.64 449.14 15.30 6.00

RG Nagar

SR (Ext)

PILLUR - SUB BRANCHES FOR FEEDERMAIN – IV

6 - 10 1570 32.58 40.92 200 DI K7 S/S - 10 423.54 15.00 438.54 3.10 441.64 44.14 15.00 9.00

Sanganur

Road SR

(Prop)

7 - 9 480 16.78 22.78 180 HDPE PN

8 - 9 423.52 13.70 437.22 3.00 440.02 445.2 13.70 6.00

Rathinapuri

SR (Ext)

* Pipe Outlet at Proposed SR at Bharathi Park is connected below the MWL to get its supply from Bharathi Park MSR to suit gravity supply &

thereby to avoid Sump cum Pumping arrangements

107

Table No. 2.27 Siruvani Feeder Main I From Existing MSR at Bharathi Park to Proposed SR at Housing Unit (By Pumping)

Str

etch

Len

gth

(M

)

Inte

rmed

iat

e F

low

(Lp

s)

Ult

ima

te

Flo

w (

Lp

s)

Dia

met

er

(Mm

)

Pip

e

Ma

teria

l

Pip

e

Rem

ark

s

No

de

Nu

mb

er

GL

(M

)

Sta

gin

g

Hei

gh

t (M

)

LW

L (

M)

Dep

th o

f

Wa

ter (

M)

MW

L (

M)

Pip

e O

utl

et

Lev

el (

M)

Ca

pa

city

(LL

)

SR

Na

me

(EX

T/P

RO

)

1 - 2 2810 402.37 505.33 1000 MS (10 MM THICK) - 2 422.55 - - - - - - -

2 - 8 360 193.51 243.02 900 MS (10 MM THICK) - 8 422.23 - - - - - - -

8 - 9 2120 66.56 83.60 500 DI K7 S/S - 9 422.50 15.00 437.50 3.70 441.20 442.20 18.00 Housing Unit SR (PRO)

Siruvani - Branches For Feeder Main - I

2 - 3 905 208.86 262.31 700 MS (7 MM THICK) - 3 421.42 - - - - - -

3 - 4 300 131.74 165.46 500 DI K7 S/S - 4 422.02 - - - - - -

4 - 5 215 68.05 85.46 450 CI EXISTING 5 422.40 11.00 433.40 3.00 436.40 438.90 20.00 D.B.Road SR (EXT)

3 - 6 267 77.12 96.85 350 DI K7 S/S - 6 418.45 15.00 433.45 4.00 437.45 439.95 20.00 AKS Nagar SR (PRO)

4 - 7 26 63.69 79.99 450 CI EXISTING 7 421.50 9.75 431.25 3.00 434.25 436.75 19.80 Gandhi Park SR (EXT)

8 - 10 855 126.94 159.43 600 CI EXISTING 10 418.40 - - - - - -

10 - 11 2233 31.74 39.86 600 CI EXISTING 11 412.50 17.70 430.20 3.00 433.20 435.70 10.00 Jayaram Nagar SR (EXT)

10 - 12 867 95.20 119.57 350 DI K7 S/S - 12 414.70 - - - - - -

12 - 13 1015 76.95 96.64 300 DI K7 S/S - 13 409.90 15.00 424.90 4.00 428.90 431.40 20.00 Kurinji Garden SR (PRO)

12 - 14 220 18.25 22.92 200 DI K7 S/S - 14 413.50 15.30 428.80 3.00 431.80 434.30 6.00 Cheran nagar SR (EXT)

1 - 22 893 86.02 108.03 600 DI k7 S/S - 22 431.20 - - - - - -

22 - 23 655 86.02 108.03 600 DI K7 S/S - 23 427.76 12.50 440.26 2.49 442.75 445.25 28.00 R.S.Puram SR (EXT)

1 - 28 82 74.30 93.31 600 DI K7 S/S - 28 432.00 12.00 444.00 4.00 448.00* 446.20 20.00 Bharathi Park SR * (PRO)

108

Table No. 2.28 -Siruvani Feeder Main II From Existing MSR at Bahrathi Park to Proposed Sump at Sanganur Chintamani SR

Stretch Length

(m)

Intermediate

Flow (Lps)

Ultimate

Flow (Lps)

Diameter

(mm)

Pipe

Material

Pipe

Remarks

Node

Number

GL

(m)

LWL

(m)

MWL

(m)

Staging

Height (m)

Capacity

(LL) SR Name

1 - 2 613 193.20 242.63 800 MS (8 mm

Thick) - 2 435.12 - - - - -

2 - 3 665 193.20 242.63 800 MS (8 mm

Thick) - 3 437.32 - - - - -

3 - 4 88 193.20 242.63 800 MS (8 mm

Thick) - 4 437.40 433.90 437.40 - 10.00

Sanganur

Chintamani -

Proposed Sump

109

Table No. 2.29 - Siruvani Feeder Main - III From Proposed Sump at Sanganur Chintamani SR To Existing SR at Revathi Layout

Stretch Length

(m)

Intermediate

Flow (Lps)

Ultimate

Flow

(Lps)

Diameter

(mm)

Pipe

Material

Pipe

Remarks

Node

Number

GL

(m)

Staging

Height

(m)

LWL

(m)

Depth

of

Water

(m)

MWL

(m)

Pipe

Outlet

Level

(m)

Capacit

y (LL) SR Name

1 - 2 470 116.10 148.15 500 DI K7

S/S - 2 437.29 - - - - - - -

2 - 3 1530 60.82 77.61 350 DI K7

S/S - 3 434.86 - - - - - - -

3 - 4 280 54.78 69.90 350 DI K7

S/S - 4 433.90 - - - - - - -

4 - 5 1970 48.76 62.21 300 DI K7

S/S - 5 432.65 - - - - - - -

5 - 6 1375 8.66 11.04 160 HDPE

PN 8 - 6 435.50 12.20 447.70 3.00 450.70 453.20 3.00

Revathy

Layout SR

(Ext)

SIRUVANI - BRANCHES FOR FEEDERMAIN - III

2 - 7 125 55.28 70.54 200 DI K7

S/S - 7 439.00 15.60 454.60 3.00 457.60 460.10 20.00

Boopathy

Layout SR

(Ext)

3 - 8 775 6.04 7.71 140 HDPE

PN 8 - 8 440.00 12.80 452.80 3.00 455.80 458.30 2.00

Koilmedu

SR (Ext)

4 - 9 45 6.02 7.69 110 HDPE

PN 8 - 9 440.00 12.00 452.00 3.00 455.00 457.50 2.00

Venkatapur

am SR

(Ext)

5 - 10 250 14.06 17.94 140 HDPE

PN 8 - 10 435.00 7.15 442.15 3.00 445.15 447.65 5.00

Madatur

SR (Ext)

5 - 11 710 26.04 33.23 200 DI K7

S/S - 11 428.50 12.20 440.70 3.00 443.70 446.20 10.00

Iswarya

Nagar SR

(Ext)

110

Table No. 2.29 - Siruvani Feeder Main - III From Proposed Sump at Sanganur Chintamani SR To Existing SR at Revathi Layout

Stretch Length

(m)

Intermediate

Flow (Lps)

Ultimate

Flow

(Lps)

Diameter

(mm)

Pipe

Material

Pipe

Remarks

Node

Number

GL

(m)

Staging

Height

(m)

LWL

(m)

Depth

of

Water

(m)

MWL

(m)

Pipe

Outlet

Level

(m)

Capacit

y (LL) SR Name

1 - 12 176 39.85 50.85 250 DI K7

S/S - 12 437.32 15.00 452.52 2.90 455.32 457.72 12.00

Chintamani

SR (Prop)



111

Table No. 2.30 - SRs by Direct Feeding before Siruvani MSR

S.No Service Reservoir

Name

Capacity

(LL)

Remarks on

Alignment Remarks on Tapping

1 Koilmedu 2.00 Existing Before Bharathi Park MSR

2 Boopathy Layout 20.00 Existing Before Bharathi Park MSR

3 Venkatapuram 2.00 Existing Before Bharathi Park MSR

4 Revathi Layout 3.00 Existing Before Bharathi Park MSR

5 Madathur 5.00 Existing Before Bharathi Park MSR

6 Iswarya Nagar 10.00 Existing Before Bharathi Park MSR

Total Requirement 47.00 LL (Say 4 MLD)

NOTE : Since the SRs are currently tapped by gravity before the Bharathi Park MSR, the same

system is retained, however during Drought period a separate pumping arrangements are provided to

the above said Direct Feeding SR’s from Baharathi Park MSR.

The summary of the feeder main arrangement for both Pillur and Siruvani Scheme and its SR

arrangement is listed below

1. The requirement by SRs coming under Proposed MSR at Ramakrishnapuram (ie) Pillur

Feeder Main I will be 833 Lps (ie) 72 Mld for the Ultimate Stage and 646 Lps (ie) 56 Mld

for the Intermediate Stage. Since the SR’s are designed for 1/3rd of Intermediate

Requirement, the capacity of SR capacity designed is for 20 Mld approximately.

2. The requirement by SRs coming under Existing MSR at Ramakrishnapuram (ie) for Pillur

Feeder Main II, III & IV will be 1450 Lps (ie) 125 Mld for the Ultimate Stage and 1142

Lps (ie) 99 Mld for the Intermediate Stage. Since the SR’s are designed for 1/3rd of

Intermediate Requirement, the capacity of SR capacity designed is 36 Mld approximately.

3. The requirement by SRs coming under Existing MSR at Baharthi Park (ie) for Siruvani

Main I, II, III (Including the Direct Feeding SRs) will be 867 Lps (ie) 75 Mld for both

Ultimate & Intermediate Stage. Since the SR’s are designed for 1/3rd of Intermediate

Requirement, the capacity of SR capacity designed is 22 Mld approximately.

Since the quantum of supply from Siruvani is fixed as 75 mld during the entire design period of 30

years, SRs coming under Siruvani system are carefully delineated such that the total requirement lies

well within the 75 Mld ((22 x 3 = 66 Mld) for SR’s coming under Existing MSR at Siruvani + 12 Mld

for Direct feeding SR’s fed before Siruvani MSR = 75 Mld as discussed above) and can be fed from

Siruvani MSR. Vysial Street SR & Town Hall SR currently fed under Siruvani System was

reallocated to Pillur system. The balance ultimate requirement of 215 mld (ie) 289.280 – 75 = 214.28,

say 215 mld is reallocated to Pillur MSR.



112

Interconnnecting Pillur MSR Outlets for Balance Reservoir Action

The summary of the feeder main arrangement for both Pillur and Siruvani Scheme and the

importance of Interconnecting Pillur MSR outlets arrangements is justifified below.

1. The requirement by Pillur Feeder Main I served by Proposed MSR at Ramakrishnapuram

for the ultimate stage is calculated to be 876 Lps (ie) 76 Mld approximately.

2. The requirement by Pillur Feeder Main II, III & IV served by Existing MSR at

Ramakrishnapuram for the ultimate stage is calculated to be 1523 Lps (ie) 134 Mld

approximately with a Bulk Water Storage of 5 Mld totaling to 139 Mld approximately.

3. The requirement by Siruvani Feeder Mains served by Existing MSR at Bharathi Park for

the ultimate stage is calculated to be 867 Lps (ie) 75 Mld approximately.

Table No. 2.31 - Summary of flow in Feeder Mains

S.No Description Inflow to MSR

(MLD)

Requirement by

ELSRs (Approx

Mld)

Remarks

1 Pillur – New MSR System 62.50 76 All MSR at

Pilllur Scheme

to be

Interlinked and

should act as

Balancing

Reservoir

2 Pillur - Old MSR System 62.50 139

3 Pillur - New MSR after

Intermediate Stage 89 -

4 Siruvani MSR System 63 63

5 Siruvani Direct Feeding System 12 12

TOTAL 290 Mld

(Approx)

290 Mld

(Approx)

It is observed that asthe requirement of ELSRs connected to Old MSR and New MSR are

higher than the total storage capacity of MSR, an additional of 89 Mld storage capacity is to

be constructed after the Intermediate Stage (year) and all the three MSRs should be

interconnected and act as collective balancing reservoir for the entire Pillur system and to

over come the individual shortage of each MSRs.

The Pillur feeder main outlets say Pillur Feeder Main I (From Proposed MSR at

Ramakrishnapuram to Bharthi Nagar), Pillur Feeder Main II (From Existing MSR at

Ramakrishnapuram to Lakshmi Mill Colony), Pillur Feeder Main III (From Existing

MSR at Ramakrishnapuram to Rakatchi Garden Sump) to be tapped only from the

Interconnected pipe outlet of Old & New MSR at Ramakrishnapuram. This will avoid

any surplus (Resulting in MSR Overflow) or deficit condition (Resulting in Drying of

MSR) that may occur in any of the system due to excess requirement or less

requirement by the Distribution System compared to inflow to any of the MSR and



113

both MSR’s thereby will act as a balancing reservoir during such circumstances. The hydraulic designs of all the Feeder mains are listed in Volume II, Feeder Main part of this

report.

(v) Appurtenances Proposed

1. Sluice Valve

Details of sluice valves proposed with sizes and numbers in both the system are listed below in Table

No.2.32

Table No. 2.32 - Sluice Valves in Feeder Main

Feeder Mains 100 125 150 200 250 300 350 400 500 600 700

Pillur Main I - - - 8 2 6 2 - 2 - 2

Pillur Main II - - - 3 1 8 2 3 1 - -

Pillur Main III - - - - - 1 - - - - -

Pillur Main IV - - 1 - - 1 - - - - -

Siruvani Main I - - - 1 - 4 1 2 - 1 -

Siruvani Main II - - - - - - - - - 1 -

Siruvani Main III - 2 - 2 - - 1 - - - -

TOTAL 0 2 1 14 3 20 6 5 3 2 2

2. Scour Valve

Details of scour valves proposed with sizes are listed below in Table No. 2.33

Table No. 2.33 - Scour Valves in Feeder Mains

Feeder Mains 100 125 150 200 250 300 350 400 450 500 700 800

Pillur Main I

- 4 2 4 1 - 1 - 1 - -

Pillur Main II

- - 1 2 1 1 3 - - - 4

Pillur Main III

- - - 2 - - - - - - -

Pillur Main IV 1 - 2 - 1 1 - - - - - -

Siruvani Main I

- - 1 - 2 3 1 - - - -

Siruvani Main II

- - - - - - - 1 - - -

Siruvani Main III 1 1 - 2 - - - - - - - -

TOTAL 2 1 6 6 9 5 4 5 1 1 0 4

3. Air Valve

Details of Air valves proposed with sizes are listed below in Table No. 2.34

Table No. 2.34 - Air Valves in Feeder Mains

Feeder Mains 50 80 100 150 200

Pillur Main I - 7 6 3 1

Pillur Main II 0 3 4 2 3



114

Feeder Mains 50 80 100 150 200

Pillur Main III - - 2 - -

Pillur Main IV 2 3 1 - -

Siruvani Main I - 1 2 3 1

Siruvani Main II - - - 1 -

Siruvani Main III 1 1 - - -

TOTAL 3 15 15 9 5

4. Flow Regulating Valves

Flow regulating valves are proposed at the Inlet of SRs coming under each feeder main system listed

below where residual pressure is very high when compared to other SRs. This will help to regularize

the flow within the system and for equal distribution at the same time for all the SRs. The details of

Flow Regulating valves are listed in Table No.2.35

Table No. 2.35 – Flow Regulating Valves for Pillur System

Feeder Mains 50 65 80 100 125 150 200

Pillur Main I - 1 2 2 5 2 1

Pillur Main II - 2 - 1 - 1 2

Pillur Main III - - - - - - -

Pillur Main IV - - - - - - -

Siruvani Main I - - - - 1 - 1

Siruvani Main II - - - - - - -

Siruvani Main III - - - - - - -

TOTAL 0 3 2 3 6 3 4

The typical details of Sluice Valves, Scour Valves & Air valves and other Standard Drawings are

shown in Dwg No. 10/1811150/WSS/WIN/140 to 142, Volume VI part of this DPR.

5. Bulk Water Meters and Data Loggers

Bulk water meters are proposed at the outlet of each SR and MSR for each DMAs. This will meet the

requirement of determining the transmission losses at feeder mains and also to ascertain distribution

system losses. Number of bulk water meters proposed are 101 out of which 101 numbers are used in

Distribution Sytem Zones and 4 numbers for MSRs.

Outlet at MSR – Sum of outlet at SRs = Transmission Losses in Feeder Mains

Outlet at Each SR - Sum of Consumption = Distribution Losses in the Network

The typical details of Bulk Water Meter with Data Logger for Flow & Pressure Measurement and

other Standard Drawings are shown in Dwg No.10/1811150/WSS/WIN/144, Volume VI part of this

DPR.



115

(vi) Observations on Hydraulic Design of Feeder Mains

The following are the observations made from the hydraulic design of the Feeder Main System

1. Pillur System

Three existing SRs - Jai Nagar, RG Nagar and Rathinapuri SR and three proposed SRs

namely Nehru Street SR, Ramasamy Nagar SR, Sanganur road SR in North Zone are in

higher elevation with the level difference of 2 to 3 m higher than the exisitng MSR at

Ramakrishnapuram. So it is not being fed by the feeder mains under gravity system.

Hence ground level sump of 10 LL capacity with the retention time of 60 minutes is

proposed at Rakatchi Garden and pumping arrangements is proposed for the above 6 SRs.

Pipe Outlet of Proposed SR near to Ramakrishnapuram MSR is connected below the

Maximum Water Level of the reservoir to get its supply from Existing MSR at Pillur (to

suit gravity supply) and thereby to avoid sump cum pump arrangements

2. Siruvani System

Bharathi Park MSR consists of two tiers with 17 LL & 10 LL capacities. Top tier is

utilised for serving the SRs and the bottom tier is utilised for serving the proposed sump

at Sanganur Chintamani SR by gravity and thereby to 6 other direct feeding SRs by

pumping.

Local pumping arrangement has been proposed from the proposed sump at Sanaganur

Chinthamani SR to existing Sanganur Chinthamani SR and proposed Chinthamani SR

Presently Sanganur Chintamani SR is fed by gravity by the available head from Siruvani

MSR with the maximum water level condition. But since hydraulic designs are carried for

the Lowest Water Level condition and not for maximum water level, a sump has been

proposed at Sanganur Chintamani SR and a local pumping arrangement is now proposed.

Pipe Outlet of Proposed SR near to Bharathi Park MSR is connected below the Maximum

Water Level of the reservoir to get its supply from Existing MSR at Bharathi Park (to suit

gravity supply) and thereby to avoid sump cum pump arrangements

The details of proposed pumpsets are listed below in Table No. 2.36



116

Table No. 2.36 - Pumpset Duty (of Each Pumps) for Pillur and Siruvani System

S.No System Discharge

(Lpm)

Head

(m)

Duty

(HP) Numbers (Nos) Details

1 PILLUR

a) Rakatchi Sump to Rakatchi SR (Local

Pumping) 5640 27 44 2 Nos (1W + 1S)

Horizontal Split Case Pumpset - 75 %

Efficiency - (Intermediate Stage - 100 %

Stand by)

b) Rakatchi Sump to Jai Nagar SR & 4

other SR’s 5460 49 78 3 Nos (2W + 1S)


Efficiency - (Intermediate - 50 % Stand

by)

2 SIRUVANI

a) Sanganur Sump to Sanganur Exist SR

(Local Pumping) 960 20 6 2 Nos (1W + 1S)

Submersible - 75 % Efficiency

(Intermediate - 100 % Stand by)

b) Sanganur Sump to Chintamani Prop

SR (Local Pumping) 2580 27 20 2 Nos (1W + 1S)

Submersible - 75 % Efficiency

(Intermediate - 100 % Stand by)

c) Sanganur Sump to Revathi L/O SR

(Direct Feeding 6 SR's) 4080 35 42 3 Nos (2W + 1S)


Efficiency - (Intermediate - 50 % Stand

by)

3 MSR INTERLINKING

a) Bharathi Park GLSR to Bharathi Park

MSR (Local Pumping) 17400 24 122 3 Nos (2W + 1S)


Efficiency - (Intermediate Stage - 50 %

Stand by)

Note :

1. 10 LL Sump & Pump Room – 2 Nos of 8 x 8 x 5 m Size are proposed for Pillur System for Horizontal Split Case Pumpset arranegment

2. 7 LL Sump are proposed for Siruvani System for Submersible Pumpset arrangement and Pump Room – 1 No of 8 x 8 x 5 m Size for Horizontal Split Case

Pumpset arrangement

3. 10 LL Sump & Pump Room – 1 No of 20 x 10 x 6 m Size are proposed for MSR Interlinking System for Horizontal Split Case Pumpset arranegment



117

The cost of Feeder Mains for Pillur & Siruvani system (Excluding

Pillur Siruvani MSR Interlinking) with all appurtennces is worked out

in Volume II – Feeder Main, Sumps & Pumpsets part of this DPR and

comes around Rs. 87.23 Crores (As per Schedule of Rates 2016 –

2017)

The cost of Pumpsets, Sump cum Pumps, pump room arrangements,

generators with all appurtennces is worked out in Volume II – Feeder

Main, Sumps & Pumpsets part of this DPR and comes around

Rs. 7.19 Crores (As per Schedule of Rates 2016 – 2017)

2.9.4 Interlinking of Pillur MSR and Siruvani MSR

A separate feeder main system is proposed from the Newly Proposed MSR at Ramakrishnapuram to

the Siruvani MSR to overcome the fluctuations at Siruvani supply during the drought conditions.

Since the level difference (Lowest Water Level) between both the MSR’s is only 0.86 m

(Ramakrishnapuram MSR – Siruvani MSR = 443.86 – 443.00 = 0.86 m) interconnecting both the

MSR’s by gravity s is not feasible. So Gravity cum pumping arrangement was made.

1. Gravity System – From Existing MSR at Ramakrishnapuram to Propsoed GLSR at Bharathi Park

2. Pumping System – From Proposed GLSR at Bharathi Partk to Existing MSR at Bharathi Park

A new proposed GLSR at Bharathi Park are used to store water from Pillur MSR and tackle

the fluctuations in Siruvani supply. The existing GLSR at Bharathi Park was found to be a

very old system, served its life time and also in dilapted condition, so a new GLSR at Bharathi

Park was proposed.

The Interlinking of gravity main from Pillur MSR to Bharathi Park GLSR is designed for 50

mld transmission capacity. The local pumping arrangement from Bharathi Park GLSR to

Bharathi Park MSR is designed with 5 Nos of Horizontal Split Case pumpsets, each pumpset

capable of discharging 10 Mld for 23 hours. So any fluctuations is Siruvani supply can be met



118

out by suitable operation of pumps in a phased manner to meet the gradual deficit in Siruvani

supply. The details of feeder mains and pumpsets are given in Table No.2.37 and 2.38.

Table No. 2.37 - Gravity Interlinking between Pillur MSR & Bharathi Park GLSR

S.No Interconnecting

Feeder Main

Designed

Quantity

(MLD)

Designed Pipe

Details Length in Km

Designed

Hours of

Flow (Hrs)

1. Pillur MSR to

Bharthi Park GLSR 50.00

MS 10 THK – 900

mm

MS 8 THK – 800

mm

2626 m

5813 m 24 Hours

Table No. 2.38 - Pumping from Bharathi Park GLSR to Bharathi Park MSR

S.No Pumping Main Designed

Quantity (MLD)

Designed Hours

of Pumping (Hrs) Turbine Pump Details

1. Bharthi Park GLSR to

Bharathi Park MSR 50.00 24 Hours

7 Nos (5W + 2S) of Duty

6960 Lps x 24 m x 49 HP

(i) Appurtenances Proposed

1. Sluice Valve

Details of Scour valves proposed with sizes and numbers in the Interlinking main are listed below in

Table No. 2.39

Table No. 2.39 - Sluice Valves in Feeder Main

Interlinking Mains 600

Pillur MSR to Bharathi Park GLSR 1

1. Scour Valve

Details of Scour valves proposed with sizes and numbers in the Interlinking main are listed below in

Table No. 2.40

Table No. 2.40 - Scour Valves in Feeder Main



2. Air Valve

Details of Air valves proposed with sizes and numbers in the Interlinking main are listed below in

Table No. 2.41



119

Table No. 2.41 - Air Valves in Feeder Main



The cost for interlinking of Pillur Siruvani MSR by Feeder Main

System is worked out in Volume II – Feeder Mains, Sumps & Pumpsets

part of this DPR and comes around Rs 12.55 Crores (As per Schedule

of Rates 2016 – 2017)

2.9.5 Detailed Engineerign Design – Distribution System

The factors namely Population, Water Demand, Existing SR Capacity, Site Availability for new

proposal, Feeder Main routing and Alignments are considered while designing the 24 X 7 water

supply system in all zones and all for demo zones

(i) Zoning of the Project Area

The existing 5 water supply zones is rezoned into 4 water supply zones into North Zone, West Zone,

East Demo Zone I & East Demo Zone II for effective management of water supply system, by

delineating Demo Zone Areas, isolation of Siruvani and Pillur Systems, introducing Billing and

Collection Software System, Customer Care Software System, monitoring of Pressure Management

Network Systems and easy O & M system, etc., The design of proposed water supply zones is

described below.

1. North Zone

This zone covers the northern part of Coimbatore City Corporation with an area of 25.33 Sq.Km.

Wards covered under this zone are 1, 2(part), 3(part), 14(p), 17, 18, 19(p), 20(p), 33(p), 65, 66, 67, 68,

69, 70, 71&72 and the density of population is 9200 Persons per Sq.Km. This zone is the gateway to

the major hubs such as Mettupalayam, Sathyamangalam and Avinashi and is well connected with

National Highways. There are two railway lines; the first one is to Mettupalayam dividing this zone as

North West and North East parts and the second one is to Chennai dividing this zone as North and

South parts. As a harbinger for the major industries such as textile, foundry and pump etc., there is a

scope for rapid development in this zone. The difference in ground level within the zone is 33 m and

20 m respectively and ground level varies from 441.51 m in North West to 408.63 m in North East

and 424.34 m in North to 403.62 m in South. In addition, an IT Park Bulk Water Demand of 3 Mld



120

was also provided with North Zone as requested by Coimbatore Corporation.

2. West Zone

West Zone covers the Western part of Coimbatore City Corporation with an area of 25.64 Sq.Km.

Wards covered by the zone are 34,37,38,44 to 53 & 55 to 64 and covers partly by wards 27, 33, 35,

36, 42 & 54. The density of population is 9383 Persons per Sq.Km. This zone is the gateway to the

holy place Marudamalai and university. Coimbatore city is connected with important places like

Palakkad and Thadagam by the roads running through this zone. The contours of this zone fall from

North-West to South-East and the difference in levels is 35m. The Ground level varies from 442 m in

the North-West to 407 m in South-East.

3. South Zone

South Zone covers the southern part of Coimbatore City Corporation and with an area of 23.60

Sq.Km. This Zone covers the wards 6(p), 7(p), 12, 13, 14, 19(p), 21(p), 22, 23, 24, 25(p), 26(p), 39,

40, 41, 42, 43, 54(p). Density of population is 9383 Persons per Sq.Km. This zone is become the

gateway to the places such as Palani. Trichy and Palakad and is well connected with National

Highways. The railway line to Trichy and Palani are passing through this zone. The Ground level

varies from 401.66 m in North West to 389.63 m in North East and 400.86 m in North to 396.89 m in

South.

4. East Zone or Demo Zone I & II

East Zone covers the Eastern Part of Coimbatore City Corporation with an area of 31.05 (8.93 Sq.Km

for Demo Zone I + 22.12 Sq.Km for Demo Zone II) Sq.Km. Wards covered are 2, 3, 4, 5, 6, 7, 8, 9,

10, 11, 14, 15,16, 20, 21, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 26 etc. Density of population is

14180 Persons per Sq.Km. This zone is the gateway to major hub such as Mettupalayam,

Sathyamangalam, Trichy and Avinashi and is well connected with National Highways. There are

three natural water streams or nallas crossings this zone. There are two railway lines. The first one is

running to Mettupalayam dividing this zone along the Western Border and the second one is running

to Chennai along the Eastern Part. As there is a wide spread of vacant lands available in this zone,

there is a possibility for rapid development for residential, apartments, multiple complexes, etc.,

This zone is divided into two parts as Demo Zone I covering Race Course, Ram Nagar & Gandhi

Puram areas and as Demo Zone II covering Peelamedu, Peelamedu Pudur, Sowripalayam,

Masakalipalayam, Neelikonampalayam and Ondipudur areas. The difference in ground level within



121

the Demo Zone I is 25.57 m with levels varying from 429.07 m to 403.50 m and 45.05 m in Demo

Zone II with levels varying from 417.21 m to 372.16 m.

(ii) Rezoned Boundaries

The rezoned outer boundaries of the above Zones are mentioned in Dwg No –

10/1811150/WSS/WIN/033, Volume VI part of this DPR.The rezoned or proposed water supply

system in each zone for the horizon year demand is shown in Dwg No – 10/1811150/WSS/WIN/034

to 061 for North Zone, Dwg No – 10/1811150/WSS/WIN/062 to 077 for South Zone , Dwg No –

10/1811150/WSS/WIN/078 to 086 for Demo Zone I and in Dwg No – 10/1811150/WSS/WIN/087

to 110 for Demo Zone II and in Dwg No – 10/1811150/WSS/WIN/111 to 139 for West Zone in

Volume VI, Drawing Part of this DPR.

(iii) Propsoed Pipe Materials & Sizes

With a view to minimize the cost for pipe material, old CI pipes satisfying the hydraulic criteria are

proposed for retention, removing all AC,PSC and PVC pipes. In the case of new pipes HDPE PN6 PE

100 pipes are proposed for diameters ranging from 90 mm Diameter to 315 mm Diameter and more

than 350 mm Diameter pipes shall be of DI K7 pipes.The details of pipe sizes adopted are listed

below in Table No. 2.42

Table No. 2.42 - Pipe Sizes Proposed in Distribution System

S.No. Pipe material & Pressure Rating Diameter in mm

1 HDPE PN6 PE100 90 to 315 mm

2 DI K7 Above 350 mm

The following details gives the break up of pipe materials that was proposed in hydraulic design of

distribution system and also the break up of pipe materials that was retained. The details are given in

Table No.2.43 to 2.46



122

Table No. 2.43 – Proposed HDPE Pipe Sizes in Distribution System

ZONE S.No SUB ZONE PROPOSED PIPE LENGTH in Meters (HDPE PIPE)

90 mm 140 mm 200 mm 250 mm 315 mm

EAST I

1 SIDDHAPHUDHUR A 9807 138 - 1136 464

2 SIDDHAPHUDHUR B 9402 40 2626 - 1147

3 TATABAD A 6466 1710 1603 - 589

4 TATABAD B 7635 - 960 892 513

5 VOC EX - A 10148 - 2744 3282 -

6 VOC EX - B 14558 - - 3804 1793

7 VOC PROPOSED - A 6095 3983 36 - 2687

8 VOC PROPOSED - B 3480 684 220 - 783

EAST II

9 ANNA NAGAR A 11087 3879 3110 - -

10 ANNA NAGAR B 11266 2732 3762 - -

11 ANNAI VELANKANNI A 13637 3513 1203 - 4726

12 ANNAI VELANKANNI B 13637 3513 1203 - 4726

13 BHARATHI NAGAR A 10933 889 - 881 -

14 BHARATHI NAGAR B 11456 - - 3787 434

15 DJ NAGAR A 10792 372 - - 2940

16 DJ NAGAR B 9295 - 1271 1753 -

17 GV RESIDENCY 9200 474 - - 3698

18 HUDCO COLONY 12891 794 867 2133 -

19 KK NAGAR A 2728 2040 - 2110 -

20 KK NAGAR B 5906 927 - 1380 -

21 KOTHARI NAGAR 8526 - - - 3540



123


90 mm 140 mm 200 mm 250 mm 315 mm

22 NETHAJI NAGAR A 8442 2655 - 464 -

23 NETHAJI NAGAR B 7449 1725 - - 2116

24 RAJALAKSHMI NAGAR A 10166 58 2741 1007 -

25 RAJALAKSHMI NAGAR B 11886 1143 624 - 1892

26 SIHS COLONY 6808 697 - - -

27 SRI LAKSHMI NAGAR A 5634 - - 2899 -

28 SRI LAKSHMI NAGAR B 12212 - - - 2112

29 TAGORE NAGAR A 3275 375 - 3096 -

30 TAGORE NAGAR B 11994 - - - 3138

31 UPPILIPALAYAM 10013 - - 2687 -

NORTH

32 AVARAMPALAYAM 3249 493 132 - 226

33 GANDHINAGAR 7523 483 - 685 136

34 JAI NAGAR A 11421 3937 - - 287

35 JAI NAGAR B 25840 - 6050 - 522

36 KAMADHENU NAGAR 2738 924 - 542 373

37 KAMARAJAPURAM 5717 165 1054 999 1160

38 KARUPAYYA GOWNDER A 7640 - 2338 - 421

39 KARUPAYYA GOWNDER B 5816 928 2034 - 828

40 NEHRU STREET A 5149 - 1000 - -

41 NEHRU STREET B 7579 4980 570 - -

42 PEELAMEDU A 10091 401 2197 - 1250

43 PEELAMEDU B 5084 2157 - - -

44 PONNI NAGAR A 8433 - - 1679 1003

45 PONNI NAGAR B 11013 1580 - 721 -



124


90 mm 140 mm 200 mm 250 mm 315 mm

46 PRP 15873 - - 598 1303

47 RAKACHI GARDEN A 10809 3619 - - 1536

48 RAKACHI GARDEN B 27409 3526 - - -

49 RAMAKRISHNAPURAM A 22546 3989 - - -

50 RAMAKRISHNAPURAM B 26841 3552 - 720 3741

51 RATHINAPURI 2901 - 801 - -

52 RAYYAPA NAGAR A 7099 - - 1248 1133

53 RAYYAPA NAGAR B 4359 955 1558 - -

54 RG NAGAR 8200 - 1246 22 -

55 SANGANUR ROAD A 5418 1273 - - 711

56 SANGANUR ROAD B 6142 - 575 - -

57 VKR ZONE A 23328 1801 1155 1273 -

58 VKR ZONE B 23122 - 2525 - 1332

WEST

59 AKS NAGAR A 4664 747 1204 - -

60 AKS NAGAR B 11530 - - 1818 643

61 AKS NAGAR C 6696 - - - 1704

62 BHARATHI PARK A 2587 8711 - - -

63 BHARATHI PARK B 9698 6122 - - -

64 BOOPATHY LAYOUT A 8763 1249 - - -

65 BOOPATHY LAYOUT B 7923 - - 1591 -

66 CHERAN NAGAR 7267 773 - 846 -

67 CHINTHAMANI NAGAR A 6001 - - - 1735

68 CHINTHAMANI NAGAR B 10207 - - - 3048

69 DB ROAD A 5074 770 3770 - 882



125


90 mm 140 mm 200 mm 250 mm 315 mm

70 DB ROAD B 5257 - - - -

71 GANDHI PARK 6343 - 4271 - 2025

72 HOUSING UNIT A 9206 - - 1428 -

73 HOUSING UNIT B 5347 - - 5036 -

74 ISWARYA NAGAR A 5380 1579 1319 - -

75 ISWARYA NAGAR B 4212 - - 133 2150

76 JAYARAM NAGAR A 7872 402 - - 2257

77 JAYARAM NAGAR B 9459 315 - 2861 620

78 KOILMEDU 1109 - - - 1028

79 KURUNJI GARDEN A 11397 - - - 2380

80 KURUNJI GARDEN B 8094 1494 - 2641 -

81 MADATHUR 5252 965 508 - 1431

82 REVATHY LAYOUT 3163 1476 - 1287 247

83 RS PURAM A 7791 2963 3592 - 1418

84 RS PURAM B 12188 3915 - - -

85 SANGANUR CHINTHAMANI 3795 - - 2211 -

86 VENKATAPURAM 1019 - 765 - -

SOUTH

87 VYSIAL STREET 2132 2208 - - -

88 BSUP 13048 19 1368 - -

89 CLOCK TOWER 5440 2221 - 2210 -

90 JK GARDEN 26379 - 2874 - -

91 LAKSHMI MILL COLONY A 2666 381 - - 781

92 LAKSHMI MILL COLONY B 3775 - 963 1634 -

93 PULIYAKULAM A 10566 - 3416 - 613



126


90 mm 140 mm 200 mm 250 mm 315 mm

94 PULIYAKULAM B 10883 - - 3054 -

95 SINGANALLUR 8560 1820 2721 - -

96 SIVARAM NAGAR 23317 1352 1188 - 3730

97 THIRU NAGAR A 3794 1156 2763 - 50

98 THIRU NAGAR B 7345 - - 4043 -

99 TOWN HALL A 3495 6 - - 692

100 TOWN HALL B 3995 - 1894 - -

101 VALLIAMMAL STREET 9239 362 - 2275 -

Total Length in Meters 910092 108110 78821 72866 80693

Total Length in Kilometers 910.09 108.11 78.82 72.87 80.69

Total length of Proposed HDPE Pipes in Distribution System is about 1251 Kms which is 90.85 % of the total D’System length .



127

Table No. 2.44 – Proposed DI K7 Pipe Sizes in Distribution System

ZONE S.No SUB ZONE PROPOSED PIPE LENGTH in Meters (DI PIPE)

350 mm 400 mm 450 mm 500 mm 600 mm 700 mm

EAST I

1 SIDDHAPHUDHUR A 100 223 - - - -

2 SIDDHAPHUDHUR B - 1012 - - - -

3 TATABAD A - - 315 394 - -

4 TATABAD B - - - - - 1194

5 VOC EX - A 572 140 - - - -

6 VOC EX - B - - 225 2487 - -

7 VOC PROPOSED - A - - - - - 920

8 VOC PROPOSED - B - 370 - - - -

EAST II

9 ANNA NAGAR A - - - - 536 -

10 ANNA NAGAR B - - - 355 - -

11 ANNAI VELANKANNI A - - - - - -

12 ANNAI VELANKANNI B - - - - - -

13 BHARATHI NAGAR A - 256 - - - -

14 BHARATHI NAGAR B - - - - - -

15 DJ NAGAR A - 212 - - - -

16 DJ NAGAR B - - - - 1080 -

17 GV RESIDENCY - - - - - -

18 HUDCO COLONY - 1057 - - - 1056

19 KK NAGAR A 20 - - - - -

20 KK NAGAR B 277 - - - - -

21 KOTHARI NAGAR - - - 20 - -



128


350 mm 400 mm 450 mm 500 mm 600 mm 700 mm

22 NETHAJI NAGAR A 1067 - - - - -

23 NETHAJI NAGAR B - - - - - -

24 RAJALAKSHMI NAGAR A 569 - - - - -

25 RAJALAKSHMI NAGAR B - 150 - - - -

26 SIHS COLONY - - - 654 - -

27 SRI LAKSHMI NAGAR A - - - 2501 - -

28 SRI LAKSHMI NAGAR B 257 - - - - -

29 TAGORE NAGAR A - - - - - -

30 TAGORE NAGAR B - - - 1431 - -

31 UPPILIPALAYAM 1256 - 399 - - -

NORTH

32 AVARAMPALAYAM - - - - - -

33 GANDHINAGAR - - - - - -

34 JAI NAGAR A - - - - - -

35 JAI NAGAR B - - - - - -

36 KAMADHENU NAGAR - - - - - -

37 KAMARAJAPURAM - - - 149 - -

38 KARUPAYYA GOWNDER A - - - - - -

39 KARUPAYYA GOWNDER B - - - - - -

40 NEHRU STREET A - - 1328 - - -

41 NEHRU STREET B - - - 938 - -

42 PEELAMEDU A - 934 - 577 - -

43 PEELAMEDU B - 997 - 1215 - -

44 PONNI NAGAR A - 548 - - - 1014

45 PONNI NAGAR B 1110 - - 878 - -



129


350 mm 400 mm 450 mm 500 mm 600 mm 700 mm

46 PRP - - - - - -

47 RAKACHI GARDEN A 506 - - 594 - -

48 RAKACHI GARDEN B 2939 - - 210 - -

49 RAMAKRISHNAPURAM A 2622 - - - - -

50 RAMAKRISHNAPURAM B - - 125 - - -

51 RATHINAPURI - - - 450 - -

52 RAYYAPA NAGAR A - - - 76 524 -

53 RAYYAPA NAGAR B 521 - - 169 - -

54 RG NAGAR - - - - - -

55 SANGANUR ROAD A - - - - - -

56 SANGANUR ROAD B - 406 - 1371 - -

57 VKR ZONE A 1758 402 - 1054 - -

58 VKR ZONE B - 1148 - 282 - -

WEST

59 AKS NAGAR A 912 - - - - -

60 AKS NAGAR B - - - 632 - -

61 AKS NAGAR C - - 794 - - -

62 BHARATHI PARK A - - - 3237 - 548

63 BHARATHI PARK B - - - 4064 - -

64 BOOPATHY LAYOUT A 1331 - - - - -

65 BOOPATHY LAYOUT B 1284 - 399 - - 1218

66 CHERAN NAGAR - 196 - - - -

67 CHINTHAMANI NAGAR A - - 37 1030 - -

68 CHINTHAMANI NAGAR B - - 803 - - -

69 DB ROAD A - - - - - -



130


350 mm 400 mm 450 mm 500 mm 600 mm 700 mm

70 DB ROAD B 1665 - - 217 - -

71 GANDHI PARK - - - 1070 - 273

72 HOUSING UNIT A 2974 - - - 839 -

73 HOUSING UNIT B 250 - - 681 - 1156

74 ISWARYA NAGAR A 1085 - - - - -

75 ISWARYA NAGAR B - - 322 - - -

76 JAYARAM NAGAR A - - - 50 - -

77 JAYARAM NAGAR B - - - - - -

78 KOILMEDU - - - - - -

79 KURUNJI GARDEN A - - 853 - - -

80 KURUNJI GARDEN B 1929 - - - - -

81 MADATHUR - - - - - -

82 REVATHY LAYOUT - - - - - -

83 RS PURAM A - 164 - - - -

84 RS PURAM B - - 1872 49 - -

85 SANGANUR CHINTHAMANI 307 - - - - -

86 VENKATAPURAM - - - - - -

SOUTH

87 VYSIAL STREET - 574 - - - -

88 BSUP - - - 992 99 -

89 CLOCK TOWER - 446 - 162 - -

90 JK GARDEN - - 687 - - -

91 LAKSHMI MILL COLONY A - - - - - -

92 LAKSHMI MILL COLONY B 150 - - - - -

93 PULIYAKULAM A - 351 - 122 - -



131


350 mm 400 mm 450 mm 500 mm 600 mm 700 mm

94 PULIYAKULAM B - 879 - - - -

95 SINGANALLUR - 637 - - - -

96 SIVARAM NAGAR 413 - 1108 - 890 -

97 THIRU NAGAR A - - - 1026 1208 -

98 THIRU NAGAR B - - 178 - - -

99 TOWN HALL A - - 634 - - -

100 TOWN HALL B - 1001 - - - -

101 VALLIAMMAL STREET 1863 - - - 998 -

Total Length in Meters 27737 12103 10079 29137 6174 7379

Total Length in Kilometers 27.74 12.10 10.08 29.14 6.17 7.38

Total length of Proposed DI Pipes in Distribution System is about 93 Kms which is 6.75 % of the total D’System length.



132

Table No. 2.45 – Retained CI Pipes suitable for Hydraulic Design in Distribution System

ZONE S.No SUB ZONE EXISTING PIPE LENGTH in Meters (CI PIPE)

100 150 200 250 300 350 400

EAST I

1 SIDDHAPHUDHUR A - 2233 - - - - -

2 SIDDHAPHUDHUR B - - - - - - -

3 TATABAD A 2728 443 488 - - - -

4 TATABAD B 3211 - 390 - - - -

5 VOC EX - A - 1260 - - - - -

6 VOC EX - B 1074 - - 629 - - -

7 VOC PROPOSED - A 570 437 - - - - -

8 VOC PROPOSED - B 2690 - 167 - - - -

EAST II &

NORTH ZONE 9 to 58 NO EXISTING CI PIPES

WEST

59 AKS NAGAR A - - - - - - -

60 AKS NAGAR B - - - - - - -

61 AKS NAGAR C - - - - - - -

62 BHARATHI PARK A - - - - - - -

63 BHARATHI PARK B - - - - - - -

64 BOOPATHY LAYOUT A - - - - - - -

65 BOOPATHY LAYOUT B - - - - - - -

66 CHERAN NAGAR - - - - - - -

67 CHINTHAMANI NAGAR A - - - - - - -

68 CHINTHAMANI NAGAR B - - - - - - -

69 DB ROAD A 650 - - - - - -

70 DB ROAD B 729 64 - - - - -

71 GANDHI PARK - - - - - - -



133


100 150 200 250 300 350 400

72 HOUSING UNIT A - - - 234 - 33 -

73 HOUSING UNIT B - - - - - - -

74 ISWARYA NAGAR A - - - - - - -

75 ISWARYA NAGAR B - - - - - - -

76 JAYARAM NAGAR A - - - - - - -

77 JAYARAM NAGAR B - - - - - - -

78 KOILMEDU - - - - - - -

79 KURUNJI GARDEN A - - - - - - -

80 KURUNJI GARDEN B 511 - - - - - -

81 MADATHUR - - - - - - -

82 REVATHY LAYOUT - - - - - - -

83 RS PURAM A 2127 - - - - - -

84 RS PURAM B 2108 - - - - - -

85 SANGANUR CHINTHAMANI - 30 - 168 - - -

86 VENKATAPURAM - - - - - - -

SOUTH

87 VYSIAL STREET 2164 807 - - - - -

88 BSUP - - - - - - -

89 CLOCK TOWER 504 - 408 - - - -

90 JK GARDEN - - - - - - -

91 LAKSHMI MILL COLONY A 351 125 522 - - - -

92 LAKSHMI MILL COLONY B - - - - - - -

93 PULIYAKULAM A - - - - 209 - 325

94 PULIYAKULAM B 742 - - 439 - - -

95 SINGANALLUR - - - - - - -



134


100 150 200 250 300 350 400

96 SIVARAM NAGAR 416 - - - - - -

97 THIRU NAGAR A - - - - - - -

98 THIRU NAGAR B - - - - - - -

99 TOWN HALL A 2005 883 - 450 - - -

100 TOWN HALL B - - - - - - -

101 VALLIAMMAL STREET - - - - - - -

Total Length in Meters 22580 6282 1975 1920 209 33 325

Total Length in Kilometers 22.58 6.28 1.98 1.92 0.21 0.03 0.33

Total length of Retained CI Pipes in Distribution System is about 33 Kms which is 2.40 % of the total D’System length.

Total length of Ratined CI Pipes in Distribution System is about 33 Kms which is 19.53 % of the total Existing CI pipes in D’System length.

Total length of Ratined CI Pipes in Distribution System is about 33 Kms which is 2.94 % of the total Existing D’System length.

However, as per Technical suggestions of CPHEEO, other than retained CI pipes, the existing pipes, say PVC Pipes – 785 Kms, AC Pipes – 166 Kms, PSC – 2

Kms, out of the above, say 10 % of PVC pipes in every zone, totalling about 79 Kms of PVC Pipelines shall be reused for other schemes and accordingly 10 % of

pipe cost has been deducted in cost estimate portion of Distribution System from each zone. The other pipes namey AC / PSC shall not be used for Distribution

System



135

Table No. 2.46 – Total Pipe Length in Distribution System (Including retained pipe)

ZONE S.No SUB ZONE Total Distribution System Pipe Length (m)

EAST I

1 SIDDHAPHUDHUR A 14101

2 SIDDHAPHUDHUR B 14227

3 TATABAD A 14736

4 TATABAD B 14795

5 VOC EX - A 18146

6 VOC EX - B 24570

7 VOC PROPOSED - A 14728

8 VOC PROPOSED - B 8394

EAST II

9 ANNA NAGAR A 18612

10 ANNA NAGAR B 18115

11 ANNAI VELANKANNI A 23079

12 ANNAI VELANKANNI B 23079

13 BHARATHI NAGAR A 12959

14 BHARATHI NAGAR B 15677

15 DJ NAGAR A 14316

16 DJ NAGAR B 13399

17 GV RESIDENCY 13372

18 HUDCO COLONY 18798

19 KK NAGAR A 6898

20 KK NAGAR B 8490

21 KOTHARI NAGAR 12086

22 NETHAJI NAGAR A 12628

23 NETHAJI NAGAR B 11290



136


24 RAJALAKSHMI NAGAR A 14541

25 RAJALAKSHMI NAGAR B 15695

26 SIHS COLONY 8159

27 SRI LAKSHMI NAGAR A 11034

28 SRI LAKSHMI NAGAR B 14581

29 TAGORE NAGAR A 6746

30 TAGORE NAGAR B 16563

31 UPPILIPALAYAM 14355

NORTH

32 AVARAMPALAYAM 4100

33 GANDHINAGAR 8827

34 JAI NAGAR A 15645

35 JAI NAGAR B 32412

36 KAMADHENU NAGAR 4577

37 KAMARAJAPURAM 9244

38 KARUPAYYA GOWNDER A 10399

39 KARUPAYYA GOWNDER B 9606

40 NEHRU STREET A 7477

41 NEHRU STREET B 14067

42 PEELAMEDU A 15450

43 PEELAMEDU B 9453

44 PONNI NAGAR A 12677

45 PONNI NAGAR B 15302

46 PRP 17774

47 RAKACHI GARDEN A 17064



137


48 RAKACHI GARDEN B 34084

49 RAMAKRISHNAPURAM A 29157

50 RAMAKRISHNAPURAM B 34979

51 RATHINAPURI 4152

52 RAYYAPA NAGAR A 10080

53 RAYYAPA NAGAR B 7562

54 RG NAGAR 9468

55 SANGANUR ROAD A 7402

56 SANGANUR ROAD B 8494

57 VKR ZONE A 30771

58 VKR ZONE B 28409

WEST

59 AKS NAGAR A 7527

60 AKS NAGAR B 14623

61 AKS NAGAR C 9194

62 BHARATHI PARK A 15083

63 BHARATHI PARK B 19884

64 BOOPATHY LAYOUT A 11343

65 BOOPATHY LAYOUT B 12415

66 CHERAN NAGAR 9082

67 CHINTHAMANI NAGAR A 8803

68 CHINTHAMANI NAGAR B 14058

69 DB ROAD A 11146

70 DB ROAD B 7932

71 GANDHI PARK 13982



138


72 HOUSING UNIT A 14714

73 HOUSING UNIT B 12470

74 ISWARYA NAGAR A 9363

75 ISWARYA NAGAR B 6817

76 JAYARAM NAGAR A 10581

77 JAYARAM NAGAR B 13255

78 KOILMEDU 2137

79 KURUNJI GARDEN A 14630

80 KURUNJI GARDEN B 14669

81 MADATHUR 8156

82 REVATHY LAYOUT 6173

83 RS PURAM A 18055

84 RS PURAM B 20132

85 SANGANUR CHINTHAMANI 6511

86 VENKATAPURAM 1784

SOUTH

87 VYSIAL STREET 7885

88 BSUP 15526

89 CLOCK TOWER 11391

90 JK GARDEN 29940

91 LAKSHMI MILL COLONY A 4826

92 LAKSHMI MILL COLONY B 6521

93 PULIYAKULAM A 15602

94 PULIYAKULAM B 15997

95 SINGANALLUR 13738



139


96 SIVARAM NAGAR 32414

97 THIRU NAGAR A 9997

98 THIRU NAGAR B 11566

99 TOWN HALL A 8165

100 TOWN HALL B 6890

101 VALLIAMMAL STREET 14737

Total Length in Meters 1376515

Total Length in Kilometers 1377

Total length of Distribution System is about 1377 Kms

However, as per Technical suggestions of CPHEEO, other than retained CI pipes, the existing pipes, say PVC Pipes – 785 Kms, AC Pipes – 166 Kms, PSC – 2

Kms, out of the above, say 10 % of PVC pipes in every zone, totalling about 79 Kms of PVC Pipelines shall be reused for other schemes and accordingly 10 % of

pipe cost has been deducted in cost estimate portion of Distribution System from each zone. The other pipes namey AC / PSC shall not be used for Distribution

System



140

(iv) Service Reservoirs

The details of proposed SRs are given in Table No. 2.47 to 2.52

Table No. 2.47 – Details of Service Reservoirs

Sl.No Reservoir Name Zone SR Type SR Capacity

(LL)

Staging

Height (m) GL (m) LWL (m) MWL (m)

Depth of Water

Storage (m)

Pipe Outlet

Level (m)

1 Ramakrishna Puram SR * N Proposed 20.00 12.00 428.860 440.860 444.860 4.000 443.360 *

2 V.K.R Nagar SR N Proposed 18.00 15.00 422.500 437.500 441.200 3.700 442.200

3 Gandhi Ma Nagar SR N Existing 3.00 10.60 428.130 438.730 441.730 3.000 442.730

4 Karuippya Gounder SR N Proposed 9.00 15.00 417.700 432.700 435.800 3.100 438.300

5 Peelamedu SR N Existing 15.00 10.50 413.990 424.490 428.500 4.010 431.000

6 Kamadhenu Nagar SR N Existing 3.00 11.40 409.480 420.880 423.890 3.010 426.390

7 Avarampalayam SR N Existing 2.50 13.30 409.300 422.600 425.100 2.500 427.520

8 PRP Garden SR SR N Proposed 7.00 15.00 411.820 426.820 430.320 3.500 432.820

9 Rathinapuri SR N Existing 6.00 13.70 423.520 437.220 440.220 3.000 445.200

10 Rayappa Nagar SR N Existing 15.00 13.90 418.500 432.400 435.900 3.500 438.400

11 Kamarajapuram SR N Existing 6.00 12.60 419.900 432.500 435.500 3.000 437.500

12 Sanganur Road SR N Proposed 9.00 15.00 423.540 438.540 441.640 3.100 444.140

13 Nehru Street SR N Proposed 18.00 15.00 421.157 436.157 439.857 3.700 442.357

14 Ponni Nagar SR N Proposed 20.00 15.00 411.860 426.860 430.860 4.000 433.360

15 Jai Nagar SR N Existing 10.00 19.90 436.300 456.200 460.200 4.000 462.700

16 RG Nagar SR N Existing 6.00 15.30 428.340 443.640 446.640 3.000 449.140

17 Rakatchi Garden SR N Proposed 20.00 15.00 423.650 438.650 442.650 4.000 445.150



141


(LL)

Staging


Depth of Water

Storage (m)

Pipe Outlet

Level (m)

18 Thiru Nagar SR S Proposed 16.00 15.00 393.000 408.00 411.100 3.10 413.600

19 Valliammai nagar SR S Proposed 7.00 12.00 394.510 406.510 410.010 3.500 412.510

20 Singanallur SR S Existing 7.00 8.35 388.900 397.250 400.250 3.000 402.750

21 Puliyakulam SR S Existing 24.00 10.80 405.000 415.800 420.000 4.200 422.500

22 TownHall SR S Existing 16.00 13.60 409.000 422.600 426.800 4.200 429.300

23 Vysia Street SR S Existing 9.00 13.60 409.453 423.053 426.800 3.747 429.300

24 JK Garden SR S Proposed 4.00 15.00 402.090 417.090 420.590 3.500 423.090

25 BSUP SR S Proposed 16.00 15.00 402.090 417.090 420.190 3.100 422.690

26 Lakshmi Nagar Mill colony SR S Proposed 9.00 12.00 408.317 420.317 423.417 3.100 425.917

27 Sivaram Nagar SR S Proposed 19.00 15.00 400.530 415.530 419.430 3.700 421.930

28 Clock Tower SR S Proposed 12.00 15.00 410.150 425.150 428.050 2.900 430.550

29 Bharathi Park SR * W Proposed 20.00 12.00 432.000 444.000 448.000 4.000 446.200 *

30 Chinthamani Nagar SR W Proposed 12.00 15.00 437.319 452.319 455.219 2.900 457.719

31 Housing Unit SR W Proposed 18.00 15.00 422.500 437.500 441.200 3.700 442.200

32 AKS Nagar SR W Proposed 20.00 15.00 418.450 433.450 437.450 4.00 439.950

33 Kurinji Garden SR W Proposed 20.00 15.00 409.900 424.900 428.900 4.00 431.400

34 Sanganur Chinthamani SR W Existing 5.00 7.00 437.404 444.404 449.000 4.596 451.500

35 R.S.Puram SR W Existing 28.00 12.50 427.764 440.264 442.750 2.486 445.250

36 Gandhi Park SR W Existing 19.80 9.75 421.500 431.250 434.250 3.000 436.750

37 D.B.Road SR W Existing 20.00 11.00 422.400 433.400 436.400 3.000 438.900

38 Jayaram Nagar SR W Existing 10.00 17.70 412.500 430.200 433.200 3.000 435.700

39 Cheran nagar SR W Existing 6.00 15.30 413.500 428.800 431.800 3.000 434.300



142


(LL)

Staging


Depth of Water

Storage (m)

Pipe Outlet

Level (m)

40 Boopathy Layout SR W Existing 20.00 15.60 439.000 454.600 457.600 3.000 460.100

41 Venkatapuram SR W Existing 2.00 12.00 440.000 452.000 455.000 3.000 457.500

42 Madathur SR W Existing 5.00 7.15 435.000 442.150 445.150 3.000 447.650

43 Revathi Layout SR W Existing 3.00 12.20 435.500 447.700 450.700 3.000 453.200

44 Iswarya Nagar SR W Existing 10.00 12.20 428.500 440.700 443.700 3.000 446.200

45 Koilmedu SR W Existing 2.00 12.80 440.000 452.800 455.800 3.000 458.300

46 Tatabad SR E - I Existing 28.00 8.80 426.000 434.800 438.000 3.2 440.500

47 VOC Park-Proposed SR E - I Proposed 18.00 12.00 423.980 435.980 439.680 3.7 440.680

48 VOC Park-Existing SR E - I Existing 27.00 12.80 423.980 436.780 439.780 3 440.780

49 Siddhapudur SR E - I Existing 20.00 10.10 423.500 433.600 436.600 3 439.100

50 DJ Nagar SR E - II Existing 10.00 14.00 406.290 420.290 423.790 3.500 426.290

51 KK Nagar SR E - II Existing 10.00 13.00 399.030 412.030 415.530 3.500 418.030

52 Nethajipuram SR E - II Existing 12.00 12.00 387.491 399.491 403.141 3.650 405.641

53 SIHS Colony SR E - II Existing 3.00 12.00 399.440 411.440 415.650 4.210 418.150

54 Anna Nagar SR E - II Existing 16.00 15.00 389.110 404.110 407.610 3.500 410.110

55 GV Residency SR E - II Existing 6.00 14.00 395.650 409.650 413.150 3.500 415.650

56 Bharathi Nagar SR E - II Proposed 11.00 15.00 400.610 415.610 419.110 3.500 421.610

57 Tagore Nagar SR E - II Proposed 11.00 15.00 376.946 391.946 395.446 3.500 397.946

58 HUDCO Colony SR E - II Proposed 10.00 15.00 401.420 416.420 419.920 3.500 422.420

59 Annai Velankani Nagar SR E - II Proposed 20.00 15.00 395.590 410.590 414.590 4.000 417.090

60 Rajalakshmi SR E - II Proposed 13.00 12.00 406.262 418.262 421.462 3.200 423.962

61 Sri Lakshmi Nagar SR E - II Proposed 11.00 15.00 400.690 415.690 419.190 3.500 421.690



143


(LL)

Staging


Depth of Water

Storage (m)

Pipe Outlet

Level (m)

62 Kothari Nagar SR E - II Proposed 4.00 15.00 380.690 395.690 399.190 3.500 401.690

63 Uppilipalayam SR E - II Proposed 10.00 15.00 388.190 403.190 406.690 3.500 409.190

Note : * Pipe Outlet at Proposed SR at Bharathi Park and Proposed SR at Ramakrishnapuram are connected below the MWL to get its supply from Existing

Bharathi Park MSR & Existing MSR at Ramakrishnapuram to suit gravity supply & thereby to avoid Sump cum Pumping arrangements



144

Table No. 2.48 – Details of SR & Distribution System Demand

Sl.

No Reservoir Zone SR Type

2029

Intermedia

te

Population

(Nos)

Int

Demand

with 10 %

Loss

(LPS)

Int

Industri

al

Demand

(LPS)

Int Total

Flow - 24

hrs (Lps)

2044

Ultimate

Population

(Nos)

Ult

Demand

with 10 %

Loss (LPS)

Ult

Industrial

Demand

(LPS)

Ult Total

Flow - 24

hrs (Lps)

Distribution

System

Length

1 Ramakrishna Puram-A N Proposed 17599 30.25 - 30.248 22102 37.99 - 37.988 29157

2 Ramakrishna Puram-B N Proposed 21113 36.29 - 36.289 26516 45.57 - 45.574 34979

3 V.K.R Nagar-A N Proposed 18867 32.43 - 32.428 23695 40.73 - 40.726 30771

4 V.K.R Nagar-B N Proposed 17419 29.94 - 29.939 21876 37.60 - 37.600 28409

5 Karuippya - Zone A N Proposed 9026 15.51 - 15.514 11336 19.48 - 19.484 10399

6 Karuippya - Zone B N Proposed 8134 13.98 - 13.980 10215 17.56 - 17.557 9606

7 Peelamedu-A N Existing 12210 20.99 4.11 25.099 15334 26.36 7.110 33.466 15450

8 Peelamedu-B N Existing 7471 12.84 4.11 16.953 9382 16.13 7.110 23.236 9453

9 Kamadhenu Nagar N Existing 3700 6.36 1.65 8.008 4647 7.99 2.850 10.837 4577

10 Avarampalayam N Existing 3015 5.18 1.37 6.552 3786 6.51 2.370 8.877 4100

11 PRP Garden SR N Proposed 13823 23.76 - 23.758 17360 29.84 - 29.838 17774

12 Rathinapuri N Existing 6997 12.03 3.29 15.317 8787 15.10 5.690 20.793 4152

13 Rayappa Nagar-A N Existing 9307 16.00 4.11 20.109 11689 20.09 7.110 27.200 10080

14 Rayappa Nagar-B N Existing 6982 12.00 4.11 16.113 8769 15.07 7.110 22.181 7562

15 Kamarajapuram N Existing 9224 15.85 - 15.854 11584 19.91 - 19.911 9244

16 Sanganur Road - A N Proposed 8057 13.85 - 13.848 10118 17.39 - 17.391 7402

17 Sanganur Road - B N Proposed 9246 15.89 - 15.892 11612 19.96 - 19.958 8494

18 Nehru Street-A N Proposed 12342 21.21 - 21.212 15500 26.64 - 26.640 7477

19 Nehru Street-B N Proposed 23218 39.91 - 39.907 29160 50.12 - 50.118 14067

20 Ponni Nagar-A N Proposed 17404 29.91 - 29.913 21857 37.57 - 37.567 12675

21 Ponni Nagar-B N Proposed 21011 36.11 - 36.112 26387 45.35 - 45.352 15302

22 Jai Nagar-A N Existing 8305 14.27 - 14.275 10431 17.93 - 17.928 15643

23 Jai Nagar-B N Existing 17209 29.58 - 29.578 21612 37.15 - 37.146 32412

24 RG Nagar N Existing 8596 14.77 - 14.774 10795 18.55 - 18.555 7715



145

Sl.


2029

Intermedia

te

Population

(Nos)

Int

Demand

with 10 %

Loss

(LPS)

Int

Industri

al

Demand

(LPS)

Int Total

Flow - 24

hrs (Lps)

2044

Ultimate

Population

(Nos)

Ult

Demand

with 10 %

Loss (LPS)

Ult

Industrial

Demand

(LPS)

Ult Total

Flow - 24

hrs (Lps)

Distribution

System

Length

25 Rakatchi Garden-A N Proposed 13240 22.76 - 22.757 16628 28.58 - 28.580 17064

26 Rakatchi Garden-B N Proposed 26447 45.46 - 45.455 33214 57.09 - 57.086 34084

27 Gandhi Ma Nagar N Existing 5022 8.63 - 8.631 6307 10.84 - 10.839 8827

28 Thiru Nagar - A S Proposed 10978 18.87 6.21 25.074 13787 23.70 10.730 34.426 9997

29 Thiru Nagar - B S Proposed 12701 21.83 6.21 28.036 15950 27.41 10.730 38.145 11566

30 Valliammai nagar S Proposed 12375 21.27 - 21.270 15542 26.71 - 26.713 14737

31 Singanallur S Existing 13386 23.01 - 23.006 16811 28.89 - 28.893 13738

32 Puliyakulam A S Existing 20861 35.85 - 35.855 26199 45.03 - 45.029 15695

33 Puliyakulam B S Existing 20330 34.94 - 34.942 25532 43.88 - 43.883 15997

34 TownHall - A S Existing 16719 28.74 - 28.737 20998 36.09 - 36.090 8165

35 TownHall - B S Existing 14109 24.25 - 24.249 17719 30.45 - 30.454 6890

36 Vysia Street S Existing 15230 26.18 - 26.177 19127 32.88 - 32.875 7862

37 JK Garden S Proposed 7572.45 13.02 - 13.015 9510 16.35 - 16.345 29937

38 BSUP SR S Proposed 30576.16 52.55 - 52.553 38400 66.00 - 66.000 15525

39 Lakshmi Nagar Mill

colony -A S Proposed 6937 11.92 - 11.923 8712 14.97 - 14.974 4826

40 Lakshmi Nagar Mill

colony -B S Proposed 9481 16.29 - 16.295 11907 20.46 - 20.464 6521

41 Sivaram Nagar S Proposed 37210 63.95 - 63.954 46731 80.32 - 80.319 32414

42 Clock Tower S Proposed 22380 38.47 - 38.466 28107 48.31 - 48.309 11391

43 Bharathi Park - A W Proposed 17632 30.31 - 30.306 22144 38.06 - 38.060 15985

44 Bharathi Park - B W Proposed 21823 37.51 - 37.508 27407 47.11 - 47.106 19784

45 Chinthamani Nagar - A W Proposed 8773 15.08 - 15.078 11017 18.94 - 18.936 8803

46 Chinthamani Nagar - B W Proposed 14009 24.08 - 24.079 17594 30.24 - 30.240 14058

47 Housing Unit - A W Proposed 19132 32.88 - 32.884 24028 41.30 - 41.298 14714

48 Housing Unit - B W Proposed 16215 27.87 - 27.869 20364 35.00 - 35.000 12470

49 AKS Nagar - A W Proposed 9834 16.90 - 16.903 12351 21.23 - 21.228 7527



146

Sl.


2029

Intermedia

te

Population

(Nos)

Int

Demand

with 10 %

Loss

(LPS)

Int

Industri

al

Demand

(LPS)

Int Total

Flow - 24

hrs (Lps)

2044

Ultimate

Population

(Nos)

Ult

Demand

with 10 %

Loss (LPS)

Ult

Industrial

Demand

(LPS)

Ult Total

Flow - 24

hrs (Lps)

Distribution

System

Length

50 AKS Nagar - B W Proposed 19106 32.84 - 32.838 23995 41.24 - 41.241 14623

51 AKS Nagar - C W Proposed 12012 20.65 - 20.646 15086 25.93 - 25.929 9194

52 Kurinji Garden A W Proposed 20398 35.06 - 35.059 25618 44.03 - 44.030 14630

53 Kurinji Garden B W Proposed 20465 35.17 - 35.175 25702 44.17 - 44.175 14669

54 Sanganur Chinthamani W Existing 8326 14.31 - 14.310 10456 17.97 - 17.972 6511

55 R.S.Puram - A W Existing 21515 36.98 - 36.979 27020 46.44 - 46.441 17923

56 R.S.Puram - B W Existing 24162 41.53 - 41.528 30344 52.15 - 52.155 20129

57 Gandhi Park W Existing 33824 58.13 - 58.134 42478 73.01 - 73.010 13982

58 D.B.Road - A W Existing 21114 36.29 - 36.290 26517 45.58 - 45.576 11147

59 D.B.Road - B W Existing 15022 25.82 - 25.819 18866 32.43 - 32.425 7930

60 Jayaram Nagar - A W Existing 7489 12.87 - 12.873 9406 16.17 - 16.166 10581

61 Jayaram Nagar - B W Existing 9365 16.10 - 16.096 11762 20.22 - 20.215 13231

62 Cheran nagar W Existing 9693 16.66 - 16.660 12173 20.92 - 20.923 9082

63 Boopathy Layout - A W Existing 14869 25.56 - 25.556 18674 32.10 - 32.096 11343

64 Boopathy Layout - B W Existing 16274 27.97 - 27.972 20439 35.13 - 35.129 12415

65 Venkatapuram W Existing 3673 6.31 - 6.313 4613 7.93 - 7.928 1784

66 Madathur W Existing 9518 16.36 - 16.359 11953 20.54 - 20.545 8156

67 Revathi Layout W Existing 5859 10.07 - 10.070 7358 12.65 - 12.647 6173

68 Iswarya - A W Existing 9750 16.76 - 16.758 12245 21.05 - 21.046 9361

69 Iswarya - B W Existing 7877 13.54 - 13.538 9892 17.00 - 17.003 6819

70 Koilmedu W Existing 3663 6.30 - 6.296 4600 7.91 - 7.906 2137

71 Tatabad - A E - I Existing 23807 40.92 - 40.919 29899 51.39 - 51.3890 14736

72 Tatabad - B E - I Existing 24094 41.41 - 41.411 30259 52.01 - 52.0073 14795

73 VOC Park-Proposed -A E - I Proposed 19669 33.81 3.40 37.203 24702 42.46 5.87 48.3285 14728

74 VOC Park - Proposed-B E - I Proposed 11210 19.27 3.40 22.664 14078 24.20 5.87 30.0696 8394

75 VOC Park-Existing - A E - I Existing 20262 34.83 - 34.826 25447 43.74 - 43.7368 18146

76 VOC Park - Existing - B E - I Existing 28533 49.04 - 49.041 35834 61.59 - 61.5894 24570



147

Sl.


2029

Intermedia

te

Population

(Nos)

Int

Demand

with 10 %

Loss

(LPS)

Int

Industri

al

Demand

(LPS)

Int Total

Flow - 24

hrs (Lps)

2044

Ultimate

Population

(Nos)

Ult

Demand

with 10 %

Loss (LPS)

Ult

Industrial

Demand

(LPS)

Ult Total

Flow - 24

hrs (Lps)

Distribution

System

Length

77 Siddhapudur - Zone A E - I Existing 13318 22.89 2.09 24.980 16726 28.75 3.61 32.3597 14104

78 Siddhapudur - Zone B E - I Existing 13566 23.32 2.09 25.406 17037 29.28 3.61 32.8952 14227

79 DJ Nagar - Zone A E - II Existing 8754 15.05 - 15.046 10994 18.90 - 18.8955 14313

80 DJ Nagar - Zone B E - II Existing 10808 18.58 - 18.576 13574 23.33 - 23.3296 13396

81 KK Nagar - A E - II Existing 7784 13.38 - 13.379 9776 16.80 - 16.8025 6898

82 KK Nagar - B E - II Existing 9692 16.66 - 16.658 12172 20.92 - 20.9209 8589

83 Nethajipuram - A E - II Existing 10531 18.10 - 18.100 13225 22.73 - 22.7312 12629

84 Nethajipuram - B E - II Existing 9414 16.18 - 16.180 11823 20.32 - 20.3206 11290

85 SIHS Colony E - II Existing 4240 7.29 - 7.288 5325 9.15 - 9.1523 8159

86 Anna Nagar A E - II Existing 13727 23.59 - 23.594 17240 29.63 - 29.6314 18639

87 Anna Nagar B E - II Existing 13337 22.92 - 22.922 16749 28.79 - 28.7877 18115

88 GV Residency E - II Existing 8717 14.98 - 14.982 10948 18.82 - 18.8161 13363

89 Bharathi Nagar - A E - II Proposed 6390 10.98 6.03 17.016 8026 13.79 10.430 24.2239 12959

90 Bharathi Nagar - B E - II Proposed 7732 13.29 6.03 19.323 9711 16.69 10.430 27.1205 15680

91 Tagore Nagar A E - II Proposed 5288 9.09 2.82 11.908 6641 11.41 4.875 16.2888 6746

92 Tagore Nagar B E - II Proposed 12983 22.31 2.82 25.134 16305 28.02 4.875 32.8984 16563

93 HUDCO Colony E - II Proposed 15692 26.97 7.14 34.108 19707 33.87 12.340 46.2108 18931

94 Annai Velankani Nagar

- A E - II Proposed 19286 33.15 - 33.148 24221 41.63 - 41.6303 22098

95 Annai Velankani Nagar

- B E - II Proposed 20142 34.62 - 34.620 25297 43.48 - 43.4784 23079

96 Rajalakshmi A E - II Proposed 13954 23.98 - 23.983 17525 30.12 - 30.1204 14537

97 Rajalakshmi B E - II Proposed 12305 21.15 - 21.148 15453 26.56 - 26.5600 15700

98 Sri Lakshmi Nagar A E - II Proposed 10733 18.45 - 18.447 13479 23.17 - 23.1667 11034

99 Sri Lakshmi Nagar B E - II Proposed 10844 18.64 - 18.638 13619 23.41 - 23.4074 14581

100 Kothari Nagar E - II Proposed 7741 13.31 - 13.306 9722 16.71 - 16.7103 12086

101 Uppilipalayam E - II Proposed 13425 23.07 9.17 32.248 16860 28.98 15.860 44.8387 14355



148

Sl.


2029

Intermedia

te

Population

(Nos)

Int

Demand

with 10 %

Loss

(LPS)

Int

Industri

al

Demand

(LPS)

Int Total

Flow - 24

hrs (Lps)

2044

Ultimate

Population

(Nos)

Ult

Demand

with 10 %

Loss (LPS)

Ult

Industrial

Demand

(LPS)

Ult Total

Flow - 24

hrs (Lps)

Distribution

System

Length

TOTAL

1395199

Nos

2398 Lps 80 Lps 2478 Lps 1752203 Nos

3012 Lps 139 Lps 3150 Lps 1374734 m

2072LL 69 LL 2141 LL 2602 LL 120 LL 2722 LL 1375 Km

Table No. 2.49 – Proposed Distribution System Demand or Rezoned Demand

Propsoed D’Syetm Demand for Intermediate Stage Requirement

D’System Requirement (From Table 2.48 above ) 214.113 Mld

Industrial Demand retained at Existing MSR at Pillur for Intermediate Stage 3.052 MLD

Sub Total 217.165 MLD

5 % Transmission Loss 9.42 MLD

Distribution System Designed for Intermediate Stage 226.583 MLD (Which is the Project Intermediate requirement)

Propsoed D’Syetm Demand for Ultimate Stage Requirement

D’System Requirement (From Table 2.48 above ) 272.176 Mld

Industrial Demand retained at Existing MSR at Pillur for Ultimate Stage 5.276 MLD

Sub Total 277.452 MLD

5 % Transmission Loss 11.83 MLD

Distribution System Designed for Ultimate Stage 289.280 MLD (Which is the Project Ultimate requirement)



149

Table No. 2.50 – Details of SR with Ward Numbers Covered

Sl.No Reservoir Zone SR Capacity (LL) Wards Covered (Old) Wards Covered (New)

1 Ramakrishna Puram N Proposed 20.00 17(P), 70(P), 72(P) 40(P), 47(P), 41(P)

2 V.K.R Nagar N Proposed 18.00 1(P), 2(P), 3(P) 39(P), 38(P), 37(P)

3 Gandhi Ma Nagar N Existing 3.00 72(P) 41(P)

4 Karuippya Gounder N Proposed 9.00 1(P), 2(P), 3(P) 39(P), 38(P), 37(P)

5 Peelamedu N Existing 15.00 1(P), 2(P), 14(P), 17(P) 39(P), 38(P), 66(P), 40(P)

6 Kamadhenu Nagar N Existing 3.00 17(P), 19(P) 40(P), 55(P)

7 Avarampalayam N Existing 2.50 17(P) 40(P)

8 PRP Garden SR N Proposed 7.00 1(P), 17(P) 39(P), 40(P)

9 Rathinapuri N Existing 6.00 67(P) 49(P)

10 Rayappa Nagar N Existing 15.00 69(P), 70(P), 71(P) 48(P), 47(P), 46(P

11 Kamarajapuram N Existing 6.00 66(P), 69(P), 70 (P) 45(P), 48(P), 47 (P)

12 Sanganur Road N Proposed 9.00 66 (P) 45 (P)

13 Nehru Street N Proposed 18.00 33(P), 67(P), 68(F), 69(P) 50(P), 49(P), 49(F), 48(P)

14 Ponni Nagar N Proposed 20.00 17(P), 18(P), 19(P), 20 (P)

69(P), 70(P)

40(P), 53(P), 55(P), 55 (P)

48(P), 47(P)

15 Jai Nagar N Existing 10.0 65(P), 66(P), 72 (P) 44(P), 45(P), 41 (P)

16 RG Nagar N Existing 6.00 66(P) 45(P)

17 Rakatchi Garden N Proposed 20.00 65(P), 70(P), 71(F), 72(P) 44(P), 47(P), 46(F), 41(P)

18 Thiru Nagar S Proposed 16.00 7(P), 11(P), 12 (P), 14 (P), 23 (P), 24

(P)

63(P), 64(P), 75 (P), 66 (P),

67 (P), 68(P)

19 Valliammal Street S Proposed 7.00 7(P), 11(P), 12(P) 14(P), 23(P), 24(P) 63(P), 64(P), 75(P) 66(P),

67(P), 68(P)

20 Singanallur S Existing 7.00 6 (P), 7 (P) 61 (P), 63 (P)

21 Puliyakulam S Existing 24.00 21(P), 22(P), 23(P), 25(P), 26(P) 70(P), 69(P), 67(P), 73(P),

71(P)

22 TownHall S Existing 16.00 13(P), 25(P), 38(P), 39(P), 40(P),

54(P)

74(P), 73(P), 81(P), 82(P),

86(P)

23 Vysia Street S Existing 9.00 41(P), 42(P), 43(P), 44(P) 84(P), 85(P), 84(P), 83(P)



150


24 JK Garden S Proposed 4.00 12(P), 54(P) 75(P), 86(P)

25 BSUP SR S Proposed 16.00 54(P) 86(P)

26 Lakshmi Nagar Mill colony S

Proposed 9.00 14(P), 19(P), 21(P), 26(P) 66(P), 55(P), 70(P), 71(P)

27 Sivaram Nagar S Proposed 19.00 13(F), 22(P), 24(P), 25(P) 74(F), 69(P), 68(P), 73(P)

28 Clock Tower S Proposed 12.00 37(P), 38(P) 42(P), 44(F), 45(P) 81(P), 85(P), 83(F), 80(P)

29 Bharathi Park W Proposed 20.00 33(P), 34(F), 35(P), 57(P) 61(P),

63(P), 64(P)

50(P), 22(F), 22(P), 21(P)

13(P), 11(P), 10(P)

30 Chinthamani Nagar W Proposed 12.00 34(P), 61(P), 62(P), 63(P) 64(P) 22(P), 13(P), 12(P), 11(P)

10(P)

31 Housing Unit W Proposed 18.00 55(P), 57(P), 58(F) 76(P), 21(P), 20(F)

32 AKS Nagar W Proposed 20.00 42(P), 52(F), 53(P), 56(P) 85(P), 79(F), 78(P), 77(P)

33 Kurinji Garden W Proposed 20.00 41(P), 42(P), 43(P), 53(P), 54(P),

55(P)

84(P), 85(P), 78(P), 86(P),

76(P)

34 Sanganur Chinthamani W Existing 5.00 34(P), 62(P), 63(P), 64(P) 22(P), 12(P), 11(P), 10(P)

35 R.S.Puram W Existing 28.00 34(P), 35(P), 36(P), 49(F) 50(F),

51(P), 52(P), 57(P)

22(P), 22(P), 25(P), 23(F)

79(F), 24(P), 21(P)

36 Gandhi Park W Existing 19.80 27(P), 36(P), 47(P), 48(F) 51(P),

52(P)

72(P), 25(P), 24(F) 24(P),

79(P)

37 D.B.Road W Existing 20.00 27(P), 37(P), 44(P), 45(P) 46(P),

47(P), 48(P), 51(P)

72(P), 81(P), 83(P), 80(P) ,

24(P), 24(P)

38 Jayaram Nagar W Existing 10.00 34(P), 60(P), 61(P), 62(P) 22(P), 14(P), 13(P), 12(P)

39 Cheran nagar W Existing 6.00 56(P) 77(P)

40 Boopathy Layout W Existing 20.00 34(P), 60(P), 61(P), 62(P) 22(P), 14(P), 13(P), 12(P)

41 Venkatapuram W Existing 2.00 59(P), 60(P) 15(P), 14(P)

42 Madathur W Existing 5.00 57(P), 59(P) 21(P), 15(P)

43 Revathi Layout W Existing 3.00 59(P) 15(P)

44 Iswarya Nagar W Existing 10.00 57(P), 59(P) 21(P), 15(P)

45 Koilmedu W Existing 2.00 60(P) 60(P)

46 Tatabad - Existing E - I Existing 28.00 18(P), 29(P), 30(P), 31(P), 32(P), 53(P), 52(P), 51(P), 50(P),



151


33(P), 35(P) 67(P), 69(P) 22(P) 49(P), 48(P)

47 VOC Park-Proposed E - I Proposed 18.00 20(P), 25(P), 26(P), 27(P) 28(P),

30(P) 31(P), 35(P), 36(P)

55(P), 73(P), 71(P), 72(P)

54(P), 52(P) 51(P), 22(P),

25(P) 48 VOC Park-Existing E - I Existing 27.00

49 Siddhapudur E - I Existing 20.00 20(P), 26(P), 28(P), 29(P) 55(P), 71(P), 54(P), 52(P)

50 DJ Nagar E - II Existing 10.00 2(P), 3(P), 4(P), 9(P), 10(P), 16(P) 38(P), 37(P), 59(P), 58(P),

57(P), 56(P)

51 KK Nagar E - II Existing 10.00 15(P), 16 (P) 65(P), 56 (P)

52 Nethajipuram E - II Existing 12.00 4(P), 5(P), 6 (P) 59(P), 60(P), 61 (P)

53 SIHS Colony E - II Existing 3.00 4 (P) 59 (P)

54 Anna Nagar E - II Existing 16.00 4(P), 6(P), 8(P), 9 (P) 59(P), 61(P), 62(P), 58(P)

55 GV Residency E - II Existing 6.00 9(P), 10(P) 58(P), 57(P)

56 Bharathi Nagar E - II Proposed 11.00 4(P) 59(P)

57 Tagore Nagar E - II Proposed 11.00 5(P), 6 (P) 60(P), 61 (P)

58 HUDCO Colony E - II Proposed 10.00 10(P), 16(P) 57(P), 56(P)

59 Annai Velankani Nagar E - II Proposed 20.00 7(P), 10(P), 14(P), 15(P) 63(P), 57(P), 66(P), 65(P)

60 Rajalakshmi Nagar E - II Proposed 13.00 8(P), 9(P), 10(P), 11(P) 62(P), 58(P), 57(P), 64(P)

61 Sri Lakshmi Nagar E - II Proposed 11.00 2(P), 14(P), 16P) 38(P), 66(P), 56(P)

62 Kothari Nagar E - II Proposed 4.00 6(P), 7(P) 61(P), 63(P)

63 Uppilipalayam E - II Proposed 10.00 6(P), 7(P), 8(P), 11(P) 61(P), 63(P), 62(P), 64(P)

Note : All SRs with Importtant Landmarks are annexed in Annexure Number – A11, Volume I (a) Part of this Report



152

Table No. 2.51 – Proposed Service Reservoir Capacity

Quantification of SR Capacity for Intermediate / Ultimate Stage Requirement

Intermediate D’System Requirement = 2141.13 LLD = 2141 / 3 = 713.71 LLD = 71.37 Mld (From Table 2.48)

SR Capacity Proposed = 787.30 LLD = 78.73 Mld (From Table No. 2.50)

Therefore, Proposed 78.73 Mld > Required 71.37 Mld

The higher capacity is due to rounding off SR capacity to next lakh litre as per norms

Table No. 2.52 – Details of SR with Reserved Site

29 New Service reservoirs are proposed in addition to the Existing 34 Service Reservoirs considered for Design. The synopsis of the same are listed below and the

details of proposed SRs are listed below

S.No Zone Existing SR Considered for Design Propsoed SR Total Numbers of SRs

1 North Zone 9 8 17

2 South Zone 4 7 11

3 West Zone 12 5 17

4 East Demo Zone I 3 1 4

5 East Demo Zone II 6 8 14

TOTAL 34 Nos 29 Nos 63 Nos



153

Sl.

No Reservoir Zone SR

Capacity

(LL)

Ward

No

(Old

Nos)

Name of the

Layout

Survey

Number Village Name

Classificatio

n

Required

Area (m)

Availabl

e Area

(Sqmt)

Ref *

1 Ramakrishna

Puram N Prop 20.00 72 Ganapathy 489/1B1 Ganapathy Park & OHT 45 X 45 353

S.No 174, Page

18 of North

Zone

2 V.K.R Nagar N Prop 18.00 03 VKR Nagar 293/P Vilankurichi

Village Park 40 X 40 1139

S.No 47, Page

12 of North

Zone

4 Karuppiya

Gounder N Prop 9.00 02

Karuppanna

Gounder

L/O

323 &

334 -

Vacant Land

& Kovil 35 X 35 -

S.No 20, Page

11 of North

Zone

5 Sanaganur

SR N Prop 9.00 67 Sanganur 25/3 Sanganur Reserve Site 35 X 35 905

S.No 137, Page

17 of North

Zone

6 Nehru Street

SR N Prop 18.00 69 Nehru Street 41/1 Rathinapuri Vacant 16208

S.No 144, Page

17 of North

Zone

7 PRP Garden N Prop 7.00 01 PRP Garden

81/1,2,3,8

2/1,2,3,83

/1,2 & 84

& 85

Krishnarayapu

ram Park 35 X 35 -

S.No 6, Page

11 of North

Zone

8 Rakatchi

Garden

N Prop 20.00

Site is available(Photograph Annexed) but Details on Land is not available in Land Particulars of Coimbatore

Corporation

9 Thiru Nagar S Prop 16.00 07 Thiru Nagar 563/2,563

/3 Singanallur Park 45 X 45 1671

S.No 55, Page

3 of East Zone

10 Vallliammal

Street S Prop 7.00 24

Ramanathap

uram, - - Sub - Dept 25 X 25 2580

S.No 206, Page

9 of East Zone



154

Sl.


Capacity

(LL)

Ward

No

(Old

Nos)

Name of the

Layout

Survey

Number Village Name

Classificatio

n

Required

Area (m)

Availabl

e Area

(Sqmt)

Ref *

Valliammal

Street

11 JK Garden S Prop 4.00 54 JK Garden

50/2,51,5

5/PT,56,1

34/1

Anupparpalaya

m Reserve Site 25 X 25 2059

S.No 214, Page

30 of South

Zone

12 BSUP SR S Prop 16.00 54 Service Reservoir is proposed as given by Corporation within the BSUP Developed Area Campus

13

Lakshmi

Nagar Mill

colony

S Prop 9.00 19

Lakshmi

Mills

Colony

(Girls

Higher Sec

School

Ground)

589/1A,5

90/2,591/

1,592/1,3

76,175/1

B

KR Puram

Park, Well,

Public

Purpose

35 X 35 2040 S.No 169, Page

7 of East Zone

14 Sivaram

Nagar S Prop 19.00 13

Sivaram

Nagar

338/2A,3,

339/2,3

Ramanathapur

am Park II CPS 45 X 45 682

S.No 44, Page

23 of South

Zone

15 Clock Tower S Prop 12.00 38

Big Bazar &

Raja

Junction

Street

2/1140 - Clock Tower 35 X 35 364

S.No 120, Page

26 of South

Zone

16 Bharathi Park W Prop 20.00 34

Bharathi

park Road -

1

253/1 Sanganur Reservoir 45 X 45 22951

S.No 12, Page

31 of West

Zone

17 Chinthamani

Nagar W Prop 12.00 62 KK Pudur 309PT Sanganoor

Public

Purpose 40 X 40 599

S.No 212, Page

42 of West

Zone



155

Sl.


Capacity

(LL)

Ward

No

(Old

Nos)

Name of the

Layout

Survey

Number Village Name

Classificatio

n

Required

Area (m)

Availabl

e Area

(Sqmt)

Ref *

18 Housing Unit W Prop 18.00 58

Housing

Unit, SN

Palayam

238/2,237

/A1,3,296

/1,236PT,

297/A12

A1

SN Palayam Play Space,

Open 40 X 40 2260

S.No 158, Page

40 of West

Zone

19 AKS Nagar W Prop 20.00 52 AKS Nagar 115/3,114

/1 TS Ward No 7 Open A 45 X 45 2974

S.No 113, Page

38 of West

Zone

20 Kurinji

Garden W Prop 20.00 42

Kurinji

Garden

479/29PT

,480/2PT

Kumarapalaya

m Park 35 X 35 2467

S.No 152, Page

27 of South

Zone

21 VOC Park-

Proposed E - I Prop 18.00 27 VOC Park 1/924 PT CBE Town Park 40 X 40 36280

S.No 83, Page

24 of South

Zone

22 Bharathi

Nagar E - II Prop 11.00 04

Bharathi

Nagar 332/2 - Vacant 35 X 35 1549

S.No 6, Page 1

of East Zone

23 Tagore Nagar E - II Prop 11.00 05 Tagore

Nagar

229/2PT,

229/3,230

,235,236,

237

Singanallur Park 35 X 35 4103 S.No 21, Page

1 of East Zone

24 HUDCO

Colony E - II Prop 10.00 16

Hudco

Colony

(Near PSG)

495/1,2A,

3A,503/1

B,2,504/1

B

Sowripalayam Park 35 X 35 8772 S.No 151, Page

7 of East Zone

25 Annai

Velankani E - II Prop 20.00 15

Annai

Velanganni

208, 209,

201 Sowripalayam

Public

Purpose 45 X 45 3683

S.No 134, Page

6 of East Zone



156

Sl.


Capacity

(LL)

Ward

No

(Old

Nos)

Name of the

Layout

Survey

Number Village Name

Classificatio

n

Required

Area (m)

Availabl

e Area

(Sqmt)

Ref *

Nagar Nagar

26 Rajalakshmi


Rajalakshmi

Nagar 56

Lakshmi

Puram Vacant Land 40 X 40 2959

S.No 80, Page

4 of East Zone

of CCC

27 Sri Lakshmi


Sri Lakshmi

Nagar

549/1B,5

55/1B,55

2/2 Part

Sowripalayam Park 35 X 35 2286

S.No 111, Page

5 of East Zone

of CCC

28 Kothari


Kothari

Nagar

279,283,2

88,289/4,

294/2,297

,298PT,2

99,509,54

4/1

Singanallur Play Ground 25 X 25 8125

S.No 32, Page

2 of East Zone

of CC

29 Uppilipalaya

m E - II Prop 10.00 11

Uppilipalay

m Park 218 Uppilipalayam Park / OHT 35 X 35 3003

S.No 99, Page

4 of East Zone

of CCC

Note : Photograph for Each Site is taken seperately and annexed in Annexure Number – A7, Volume I(b) part of this DPR.

* - Reference on avialble land are taken from Coimbatore Municipal Corporation Land Particulars from Town Planning Section



157

(v) Abandoned Sumps & SRs

The existing sumps and the old, abandoned SRs less than 1 lakh capacity are eliminated and not

considered for rehabilitation are listed in Table No. 2.53

Table No. 2.53 - Details of the Old and Abandoned SRs

Sl.No. SR Location Ward Number

(Old) Capacity (LL)

1 Maniyakaram Palayam SR 72 1.00

2 Police Quarters SR 72 0.50

3 V.V.Nagar SR 72 0.50

4 V.O.C Nagar Sump 72 0.50

5 Ganapathy Ma Nagar Sump 72 3.00

6 Gandhi Ma Nagar Sump 72 6.00

7 Housing Unit Sump 3 0.50

8 Nanjundapuram SR 12 2.00

9 Sowripalayam SR 14 5.00 (Staghing Height – 8m)

10 Varadharajapuram SR 11 10.00 (Staghing Height – 8m)

11 Uppilipalayam SR 11 10.00 (Dilapted Condition)

12 Bharathi Park GLSR 34 10.00

13 Bharathi Park GLSR 34 10.00 (Dilapted Condition)

14 Gandhi Park GLSR 51 10.00

15 SIHS Colony Sump 4 3.00

The cost for construction of additional service reservoirs for the

Intermediate Stage is worked out in Volume V – Structural Design &

Estimates part of this report and comes around Rs. 55.66 Crores (As

per Schedule of Rates 2016 – 2017)

(vi) Appurtenances Proposed

1. Sluice Valve

Details of sluice valves proposed with sizes in the respective zones are listed below in Table No.2.54

Table No. 2.54 - Sluice Valves in Distribution System

Zone 65 80 100 125 150 200 250 300 350 400 500

East Demo Zone I - 14 - - 3 10 1 13 1 - 3

East Demo Zone II - 29 - - 13 8 19 28 2 3 3

North - 43 - - 18 25 11 34 4 - 1

South -- 17 1 - 6 15 10 20 3 3 -

West - 24 1 - 10 9 23 36 4 1 1

TOTAL 0 127 2 0 50 67 64 131 14 7 8



158

2. Scour Valve

Details of Scour valves proposed with sizes in the respective zones are listed below in Table No.2.55

Table No. 2.55 - Scour Valves in Distribution System

Zone 50 65 80 100 125 150 200 250 300 350 400

East Demo Zone I - 21 - 1 - - - - - - -

East Demo Zone II - 33 - - - - - - - - -

North - 32 - 2 - - 3 - - - -

South - 13 - 1 2 - - - - - -

West - 29 - 1 - 1 - - 2 1

TOTAL 0 128 0 4 3 0 4 0 0 2 1

3. Air Valve

Details of Air valves proposed with sizes in the respective zones are listed below in Table No.2.56

Table No. 2.56 - AirValves in Distribution System

Zone 50 80 100 150

East Demo Zone I 5 3 2 -

East Demo Zone II 10 12 - 1

North 21 6 2 -

South 13 5 2 -

West 20 8 - -

TOTAL 69 34 6 -

The hydraulic designs for all the Distribution System are given in Designs, Volume III part of this

DPR.

4. Pressure Control Valves and Bulk Water Meter

Pressure Control valves and Bulk Water Meter are proposed at the outlet of each Distribution system

or Sub Zones, say 101 Numbers in order to regulate the pressure manually during night times, where

the demand is very less and thereby to safeguard the D’System life and also less staining of the

network due to excess pressure.

The cost for Distribution System along with Rider Mains with all the

appurtenances is worked out in Volume III – Distribution System &

Special Components part of this DPR and comes around Rs. 174.03

Crores (As per Schedule of Rates 2016 – 2017)



159

2.9.6 Automation of Distribution System – SCADA

(i) Introduction

For Coimbatore Corporation, it is proposed to have a well planned infrastructure for water supply

distribution system, which covers an area of 105.6 sq.km

The infrastructure includes,

Internal Feeder / Transmission mains – 96.50 kms

Interlinking of Pillur & Siruvani MSR systems – 8.5 Kms

Distribution System – 1375 Kms

Overhead Service Reservoirs – 63 Nos

Ground level Sumps – 3 Nos

As a part of total integrated monitoring and data acquisition system, it is proposed to install one

integrated system which will primarily controlled by PLC locally, networked through GPRS and will

have central monitoring, data acquisition and no controls. The proposed system will cover automation

and online data acquisition for Pillur system at the master control facility at the MSR site at

Ramakrishnapuram, covering feeder mains, SRs and sumps and another one for Siruvani system at the

MSR site at Bharathi Park, covering feeder mains, SRs and sumps, and a display facility at

Corporation office complex at Townhall. The purpose of integrated automation system is to have the

following for effective utilization of resources and handling emergencies centrally and to stop

pilferages and distribution losses.

Online data collection of water quality parameters and flow at MSR sites

Monitoring of water level at each SR/ GLSR

Monitoring of discharge from each SR

Online metering of water discharge from each MSRs / SRs / GLSRs

Monitoring operation of pumping machinery in pumping mains

Automatic generation of real time MIS reports without intervention of operator and

user defined graphics and reports.

(ii) Scope of work

The scope of the work of establishment of SCADA shall include design, manufacture, testing at

works, supply at site, storage at site, installation/erection, testing, commissioning, integrating with the

existing system, proving, field testing and handing over the integrated automation system. The scope

shall also include total operation and maintenance of the automation system for the period of five

years after two years of free operation and maintenance. The payment against AMC for 5 years at the

agreed rates shall be made by CCC from its own funds. The AMC shall include free up gradation of



160

SCADA software and all consumables that will be required for smooth running of the system.

(iii) System Design

Basically the system is divided in to three sections for each of the two systems namely Pillur and

Siruvani systems:

Remote monitoring of SRs / GLSRs in the distribution network

Monitroing of pumping at pumping stations

Centralized monitoring station at respective MSR site

The automation system will be designed in three layers.

Field instruments like level transmitters, pressure transmitters, motorized actuators, analyzers

etc.

PLC/RTU based control system with local HMI and facility to network with SCADA at

remote places through GPRS/GSM/RF

Centralized monitoring stations at each MSR site and both shall be connected to CCC head

office through wireless /GPRS/ Broad Band

The central monitoring station is proposed to have SCADA software, which will carryout real time

data collection and will have facility of report generation and monitoring. The networking of different

sections and SRs with central SCADA system shall be such that instantaneous status of the sections

shall be available on web through web browsers. In addition to the centralized data collection, the

system shall also generate SMS alerts from the point of generation.

(iv) Proposed System

1. SRs / GLSRs in Distribution Network

There are 63 SRs and 3 GLSRs spread all over the territory of CCC operated by manually operated

valves. It is proposed to monitor the levels and flow through each SRs on real time basis and to have

monitor over the discharge of each SRs through actuated valves from central SCADA of respective

system. Each SR site, it is proposed to install one ultrasonic level transmitter, one pressure transmitter,

and one flow transmitter, and one electrically actuated valve. All these equipments are proposed to be

connected to one PLC / RTU and it will be connected on wireless network to the central SCADA

station of the respective system.

Each PLC / RTU at SR shall have one 6” touch screen HMI for the operator to monitor the valves.

The PLC/RTU of each SR shall collect the input data and transmit the same to central SCADA at an

interval of not more than 5 min. The operation of discharge valve shall be possible from central

SCADA also. The maximum time delay form the command to initiation of valve shall not exceed 10



161

sec. The network shall be such that update time or remote operation shall not be affected by traffic on

wireless network. Each SR site shall also be provided with a UPS of suitable rating so that in the case

of power failure the flow data is not lost and the monitoring system will still keep working. The

connectivity of individual PLC at each SR site will be either through GPRS or through broadband

connection of service providers without fixed IP.

2. Central SCADA Station at MSRs

SCADA stations is proposed at Ramakrishnapuram MSR site for Pillur system and at Bharathi Park

MSR site for Siruvani system: These stations shall be acting as a master control stations as well as

MIS centers. The system shall be capable of generating various user defined reports. One of the

computer stations shall act as a history server. SCADA shall be provided with unlimited tags with run

time and also of development version.The monitor room will have two servers and two operator

terminals all connected on LAN. One operator terminal will have minimum 42” LCD monitor which

will display current status of total water system in graphical form. The servers shall work in

redundancy mode so that failure of one of the server will not result in to loss of data or monitoring.

The monitoring room shall be provided with online 10 KVA UPS capacity with the backup time of 4

hrs. The monitoring station shall be provided with broadband connection with fixed IP.At the head

office of the CCC at TownHall, one operator terminal with a minimum 42” LCD monitor displaying

the current status of both the water supply systems will be installed and this will be connected

The cost for Special Components like Automatic Meter Reading (AMR)

System, Disinfection Units, Any Time Payment Machine (ATP), Bulk

Water Meter with Data Logger for Flow & Pressure Measurement and

room for Data Logger, Gas Chlorination Disinfection is worked out in

Volume III – Distribution System & Special Component part of this

report and comes around Rs. 150.47 Crores (As per Schedule of

Rates 2016 – 2017)

The cost for Common Components like SCADA and Water Quality

Test Laboratory is worked out in Volume IV – Common Components

& Data Bank part of this DPR and comes around Rs. 8.10 Crores (As

per Schedule of Rates 2016 – 2017)



162

2.9.7 Clearances Required From Other Agencies

For this project, clearances required from other agencies such as land acquisition, road crossing,

railway crossing, etc., are listed down in Volume I (b), Annexure Number – A12 part of this DPR

2.10 Environmental Impact Assessment

This section identifies and assesses the probable impacts on different environmental parameters due to

planning, construction and the operation of the proposed development in the CCC area. After studying

the existing baseline environmental scenario, initial field surveys, reviewing the process and related

statutory norms, the major impacts have been identified and assessed during the design, construction

and the operation phases.

2.10.1 Objective of EIA

Water Supply, Drainage and Sewerage Systems, Roads and Electricity form significant infrastructure

components of any urban area. Since the city’s cleanliness to a great extent, depends on the Water

Supply, Drainage and Sewerage, Roads and Electricity systems, efficient and effective planning,

design, implementation and operation of these systems warrant importance.

Though the very purpose of the water supply, drainage and sewerage, roads and electricity systems is

to enhance the quality of urban life, there are certain adverse impacts attached to them. These impacts

are usually due to ill-planning of the systems and selection of inappropriate technologies for the

treatment and disposal of the wastes. Therefore, the negative impacts of these projects can be easily

addressed through both proactive and reactive measures.

Any development project therefore has a potential to cause Environmental and Social impacts. These

impacts are in the form of displacement of people from the project area or causing impairment of the

ambient environment of the people living in or near the project area. By taking into account the

location aspects of the project and through proper rehabilitation and replacement plans and

environment management plan, these impacts can be mitigated.

The following items form part of the Environment and Social Impact:

Legal and Policy Framework;

The proposed project;

The existing environment; and

Environmental Management Plan



163

2.10.2 Legal and Policy Framework

Major development projects are governed by international, national and local rules and regulations

pertaining to various aspects of project development viz., engineering, safety, environment, etc., the

frame work and standards related to this are described in the following paragraphs.

2.10.3 Environmental Assessment and Review Process

GOI policies and guidelines exist on the following environmental components:

Environmental and Occupational health and safety

Forest

Air Quality

Water and Effluent Quality

Social and Cultural Issues

Community Involvement

2.10.4 National Regulations

India is the first country which has made provisions for protection and improvement of the

environment in the Constitution. This was done in 1976 during the 42nd Amendment to the

Constitution. These provisions were incorporated in the Constitution of India with effect from January

1977. Article 51(g) of the Constitution states that “It should be the duty of every citizen of India to

protect and improve the natural environment including forest, lakes, rivers and wild life, and to have

compassion for living creatures”.

In India, as far as policy, legal and administrative framework with regard to the environment are

concerned, there are numerous acts formed over time, applicable to enacted at the National level

barring one or two pertaining to a particular region or State.

Provisions exist in various acts to tackle environment pollution. However, with the country’s

emerging environment scenario due to industrialization in the post independence era, these were

found either inadequate or being not effectively applicable to prevent degradation of the environment.

After the Stockholm Conference on human and air pollution, it was considered appropriate to have

uniform laws across the country for broad environmental problems endangering the health and safety

of people as well as the flora and fauna. The Water (Prevention and Control of Pollution) Act 1974

was the first enactment by the Parliament in this direction, and the pollution control boards at the

Centre and in the States came into being. Another piece of legislation enacted was the Water

(Prevention and Control of Pollution) Cess Act 1977 in order to conserve water and to augment the

finances of the regulatory agencies. Thereafter, the Air (Control and Pollution Prevention) was

enacted in 1981 and the task of implementation of the legislation was entrusted to the same regulatory

agencies created under the Water (Prevention and Control of Pollution) Act, 1974 as the Water

(Prevention and Control of Pollution) Act were designed to deal with only water and air pollution



164

problems respectively. It was in 1986 that the Parliament enacted a comprehensive or umbrella

legislation for the protection of the environment in its entirety. This was the Environment (Protection)

Act 1986. Over the years, several amendments have been made to the various existing statutes and

several notifications have been issued to address the environmental issues.

Project related impacts occur at three stages of the project:

1) Planning and Design

2) Construction

3) Operation

Planning and Design stage incorporates the location of the water intake point, location of the new

water treatment facilities, water treatment steps, laying of the pipeline and construction details,

materials of construction etc. which ultimately decide the impact during construction and operation

phase. While some of the construction phase impacts are temporary, some are permanent. The

Operation phase impacts are generally continuous in nature. To identify these impacts broadly on

physical and ecological environment, Impact Identification Matrix has been developed in the later part

of this chapter. The various Acts and Notifications on Enviromental issues have been presented in the

following table:

Summary of Indian Environment Acts

Acts / Rules /

Notifications Brief Description Remarks

The Wild Life

Protection Act, 1972

Management of forest areas as

national parks, Sanctuaries,

Game Reserves and Closed

Areas

All due care has to be taken to protect

the wild life habitats, particularly the

rare and endangered species, while

conducting the construction and

operation activities

The Forest

(Conservation) Act,

1980

Restriction on the de-

reservation of forests, clearing

of forests, cultivation of tea,

coffee, spices, etc., conversion

of land for non-forest uses, etc.

Forest clearance to be obtained in order

to clear the construction Right of Way

(RoW)

The Water

(Prevention and

Control of Pollution)

Act, 1974

Provides for the prevention and

control of water pollution as

well as restoration of water

quality

Indirect impact associated during the

construction phase with wastewater

generation

The Water

(Prevention and

Control of Pollution)

Cess Act, 1974

Provides for the levy and

collection of cess on water

consumed by persons of certain

industries and by local

authorities

For use of water in labour / staff

colonies and other installations

The Air (Prevention

and Control of

Pollution) Act, 1981

Objective is to prevent, control

and reduce air pollution

including noise pollution

Proponent will have to control

emissions of dust and noise during the

construction phase as well as exhausts

of machinery / vehicles

The Environment

(Protection) Act,

An umbrella legislation which

takes in to account all the

Environmental standards for discharge

and emissions are also promulgated



165

Acts / Rules /


1986 aspects of environment.

Management of hazardous

chemicals, wastes, micro

organisms, etc. also included

from time to time

The Manufacture,

Storage and import of

Hazardous Chemical

Rules, 1989

Promulgated under the

environment (Protection) Act,

1986. The principal objectives

are the prevention of major

accidents arising from

industrial activities and the

mitigation of effects of such

accidents on life, property and

environment

Significant Risk analysis and disaster

management plan for the potential

hazards of the installations have to be

prepared

Environmental Audit

Notification, 1992

This notification requires every

person carrying out on industry,

operation or process requiring

consent to operate under water

and air acts to submit an annual

statement to the state pollution

control board

Will need to be submitted in case of

continuing activities under the air and

water acts

The Environmental

Impact Assessment

Notification, 1994

Through this notification, the

MoEF made Environment

Impact Assessment for 29

different activities

EIA is mandatory for this project vide

Item No. 9 of Schedule I of the

Notification

Environmental

Protection rules –

Notification of

Environmental Public

Hearing, January

1997

Through this Notification,

public hearings are made

mandatory before giving

environmental clearance or

activity, either private or

government

Details of the public hearing must be

incorporated in Environment

Management Plan

Notification for

Coastal regulation

Zone (CRZ), 1991

Declared the coastal stretches

of seas, bays, estuaries, creeks,

rivers and backwaters which are

influenced by tidal action, up to

500m from the high tide line

and the land between the low

and high tide lines

Any construction activity is not

permitted within the CRZ

The National

Tribunal Act, 1995

Provides for liability for

damages arising out of any

accident occurring while

handling any hazardous

substance and for the

establishment of a National

Tribunal for effective and

expeditious disposal of cases

arising from such a accident

Compensations should comply with the

Act

The Public Liability

Insurance Act, 1991

This act imposes on the owner

the liability to provide

immediate relief with respect to

death or injury to any person or

Provisions for insurance to be made,

prior to the commencement of the

project, in accordance with the Act



166

Acts / Rules /


damage to any property

resulting from an accident

while handling any of the

notified hazardous chemicals

The Hazardous Waste

(Management and

handling) rules, 1989

Prescribe guidelines for

handling hazardous wastes

Must comply with the rules, in case of

generation of hazardous wastes during

the construction and operation phases of

the project.

2.10.5 Necessity for this EIA Study

It is necessary to study the environmental impact of the project so that necessary preventive and

corrective measures can be suggested to minimise the potential negative impacts of this project and

thereby secure maximum benefits to the people and the environment. This study involves the

following:

(a) Identification and assessment of all the likely environmental and social impacts of the

project components

(b) Development of an environmental management plan for making the project environmentally

sound and socially acceptable

(c) Recommendation of an appropriate monitoring mechanism for environmental management.

(d) Overall aim is to maximize the benefits of the project and minimize/mitigate environmental

and social risks due to the proposed project.

Environmental Impacts

Positive Impacts

Following are the positive environmental impacts of the project:

1. Social Impact due to provision of protected water supply.

2. The town is benefited with water supply.

3. Health of the community would be improved.

4. Improved community hygiene.

5. Local employment due to additional investment. Thereby local economy improves.

6. Improvement in social and economic status.

7. Additional water provided will help in fire safety.

8. Living conditions improves.

9. Decrease in water borne diseases



167

10. Women can utilize time spent for fetching water from long distances to other beneficial

purpose.

11. Noise and nuisance created by water tankers and lorries are avoided.

Negative Impacts

Following are the negative environmental impacts of the project:

1. Traffic is disturbed during laying water mains.

2. Dust problem during construction.

3. Communication facilities may get affected.

4. Noise near pumping station sites.

5. Disposition of water tanker owners.

6. Property & Economical assets are created which have to be maintained.

7. Health hazard in handling chemicals like chlorine.

8. Possibility of chlorine leakage.

2.10.6 Broad Paradigms for Mitigation Plan

1. Adequate safety signals to be provided like “Men at work”, “Take Diversion”, etc and

traffic to be effectively diverted.

2. Sprinkling of water can reduce dust.

3. Adequate care to be taken not to disturb the communication systems by identifying the

locations in consultation with the respective departments.

4. Noise can be reduced by proper design and maintenance and planting of trees around

sump cum pump houses. If required, glass partitions can be provided as sound barriers.

5. Carry out repairs wherever possible when traffic is minimum. Ensure good house

keeping.

6. Action would be taken for installation of sewerage system and storm water drainage

system and avoid stagnation of water.

7. Backwash water should be properly disposed of

8. All precautions would be taken to avoid leakage of chemicals during post chlorination.

The operators would be instructed regarding handling of chemicals, action to be taken in

case of emergency, etc.,



168

2.10.7 Resettlement and Rehabilitation Issues

As all the sites proposed for construction of new service reservoirs, ground level sumps etc., are

owned by Coimbatore Corporation, there will be no resettlement or rehabilitation issues to be

confronted during the implementation of this project.

2.10.8 Management of Noise Impacts

Following precautionary measures are recommended for the management of noise impacts.

1. To minimise the impact, construction operations in residential and sensitive areas should

be restricted to between 7.30 a.m. and 6.00 p.m.

2. Prior information should be provided if the blasting is significant.

3. Noise level should be reduced by provision of enclosures to generator sets and concrete

mixers at the sites.

4. Noise Level of Construction Machinery should not exceed the following limits

Construction Machinery dBA at 2 m Distance

Truck 85

Generator 96

Concrete Mixer 89

Flitting Mixer 85

Vibrator 86

Batching Plant 86

Crane 85

Permissible level 55 d BA

2.10.9 Managing Impacts due to Construction Machinery

Precautionary measures in order to avoid adverse impacts due to traffic congestion are as follows:

1. The most suitable route should be selected for delivery and haul equipment with due

consideration for load limits, traffic pattern and the character of the area traversed.

2. Traffic controls and diversions, marked with signs, lights and other measures (flags)

should be provided. This is necessary to minimise confusion and ensure public safety.

Police and fire departments should be informed before any route is closed. Also, routes

should not be closed until an alternative road is identified.

3. Prospective contractor should follow the prescribed safe, legal laid limits of all bridges

and surface roads that may be traversed by the heavy equipment used at the project sites.



169

2.10.10 Managing Impact of Air Pollution

Construction activities and the consequent transportation activities add to the air pollution in the

region. Impact of the air pollution will be moderate and short term while laying distribution lines.

Precautionary Measures

1. It is recommended that the construction equipment, machinery and diesel engines be

maintained in good condition so as to reduce emissions.

2. Dust should be controlled by sweeping and sprinkling with water. Mud should be washed

from all construction equipment and vehicles prior to hauling on roads.

3. Trucks carrying dust and sand to and from the construction site should be covered or

wetted in accordance with the construction specifications prescribed by the Coimbatore

City Corporation to minimise release of dust.

Potential Air Quality and Noise Impact Issues

Activity Location Impact

Pipeline laying Roadside areas Dust problem for Commuters and road users

Construction of Proposed

Service Reservoirs Reserved Site areas Dust problem for near by living habitants

Construction of Proposed

Sump cum Pumping

arranegments

Reserved Site areas Dust problem for near by living habitants

Pipeline laying

For laying of pipelines, the impacts on air quality during construction are due to generation of dust for

excavation and handling of construction materials. Dust generation during pipeline laying is important

because it passes by roadside which is used by commuters and local people.

After pipelines are laid underground and the trench is filled with soil, the topsoil is not often properly

compacted and the debris is left behind. This causes dust pollution for quite some period until the top

cover stabilizes. Dust pollution may therefore have a significant impact if not properly mitigated.

Short-term exposure to particulates can aggravate lung diseases, causing asthma attacks and acute

bronchitis and may also increase susceptibility to respiratory infections.

Construction of Service Reservoirs & Sump cum Pumps

Construction work for these infrastructures can be divided into three groups – excavation work,

foundation work and superstructure work. Certain foundation work may involve development of pile

driving rigs etc. These activities may generate noise pollution. Besides foundation work will involve

trench cutting, digging and concreting work. The work will involve steel and concrete work, masonry

work etc and will involve use of equipment like hoists, cranes, mixers, welding sets etc. There will be



170

dust, noise and gaseous pollution due to these works. The mechanical erection works involve

extensive use of mechanical equipment for storage, retrieval and erection, site fabrication etc leading

to some noise and air pollution. Since the construction of Service Reservoirs and Sump cum Pumps

are going to be in the reserved site areas of Coimbatore Corporation, only the habitants surrounding

the reserved site areas will be affected.

Environmental Management Plan - Construction Phase Impacts

Sl.

No. Issues Action to be taken

Responsible

Agencies

Time Frame

For

Implementation

Pre-

construction

Impacts

1.

Site clearance,

Flora and fauna

Impact on

vegetation

a. Adequate precaution

against damage to existing

structures, electricity and

telephone lines and other

infrastructure services

b. Site clearance will be

done only in the area

required for the project.

c. A minimum level of tree

plantation will be ensured.

No important species are

present in the area.

Prospective

Contractor

Prospective

Contractor

CCC

As per

Implementation

Schedule

As per

Implementation

Schedule

During the

period of

Construction of

Project

2. Storage of

Materials

a. Site for storage of pipes,

construction materials

and disposal of debris,

refuse, etc. to be

identified.

CCC

Before

Commencement

of the Project

Construction

Phase Impacts

3. Air Pollution

and Vibrations

a. Noisy construction

operations in residential

and sensitive areas should

be restricted between

7.30am to 6.00pm.

b. Provision of ear plugs to

operators of heavy

machinery and workers in

near vicinity

c. Preventive maintenance of

construction equipment

and vehicles to meet

emission standards and to

keep them with low

noise.

d. Provision for enclosing

Prospective

Contractor

-----do-----

-----do-----

-----do----

During the

period

of Project

execution

--------do--------

--------do--------

--------do--------



171

Sl.


Responsible

Agencies

Time Frame

For

Implementation

generator and concrete

mixers at site. Where

residences are located

within 200m from

construction sites and in

sensitive areas like

hospitals, schools,

zoological parks, etc.

Noisy construction work

shall be undertaken

during day time only

(7.30 hrs to 18.00 hrs)

e. Sound barriers in

inhabited areas shall be

installed during the

construction phase

f. During night, material,

transport should be

uniformly distributed to

minimize noise impacts.

g. Prior information to be

provided if blasting is

significant. Blasting to be

in accordance with the

Explosives Act 1984 and

Explosive Rules 1983

Prospective

Contractor

-----do-----

-----do-----

-----do-----

4.

Dust

contamination

Of Construction

Sites and along

Haul roads

h. Unpaved haul roads near /

passing through

residential and

commercial Areas to be

watered thrice a day.

Trucks carrying

construction Material to

be adequately covered.

Prospective

Contractor

During the

period

of Project

Execution

5. Earth Work

Excavation

a. Ensure unobstructed

natural drainage through

proper drainage

channels/structures

b. Dispose surplus excavated

earth at identified sites

c. Ensure minimum

hindrance to normal local

activities and business

d. Avoid damage to

permanent structures

Prospective

Contractor

-----do-----

-----do-----

-----do-----

During the

period

of Project

Execution

--------do---------

--------do---------

--------do---------

6.

Disposal of

Construction

debris

a. Daily inspection at haul

roads & sites for

construction debris for

safe collection & disposal

Construct

Management

Consultant /

During the

period

of execution of

the Project



172

Sl.


Responsible

Agencies

Time Frame

For

Implementation

to land fill sites.

b. Collection and disposal of

refuse

c. Minimise construction

debris by balancing cut &

fill requirements

Prospective

Contractor

-------do---------

-------do---------

7. Social Disruption

a. Minimize interruptions to

utility services through

proper planning &

scheduling of activities

and inter-departmental

coordination

b. Construction of temporary

road/ access & diversion

to traffic.

c. Preference to local labour

/ skilled persons during

construction, operation &

maintenance.

Construct

Management

Consultant

Prospective

Contractor

-----do-----

During the

Construction of

The Project

--------do---------

--------do---------

8. Aesthetic

impairment

a. Aesthetic enhancement

through proper house

keeping of construction

sites

b. Disposal of construction

wastes at the approved

disposal sites

c. Immediate closure of the

trenches after pipe laying

/ completion of work

d. Repair pavements

immediately following

construction of pipeline

and appurtenant

structures

e. Complete construction

activity by removing all

temporary structures,

restoring the project and

surrounding areas as near

as possible to the pre-

construction condition.

Construct

Management

Consultant/

Prospective

Contractor

-----do-----

-----do-----

During the

Construction of

the Project

-------do----------

-------do----------

9.

Conservation of

Ecological

resources

a. Farm land and forest belts

shall not be used as

materials borrow sites

b. Arable land shall not be

selected as borrow sites to

the extent possible. If

Construction

Management

Consultant

During the

Construction of

the Project



173

Sl.


Responsible

Agencies

Time Frame

For

Implementation

excavation has to be done

in arable land, topsoil

layer (30cm) shall be

saved and returned after

construction work is

completed, so as to

minimize impacts on

ecosystem, agriculture &

animal husbandry.

c. Education of construction

workers shall be

strengthened to protect

national resources, wild

plants & animals

-----do-----

-----do----

--------do---------

--------do---------

10. Construction

labour

a. Planning of labour camps

needs to be done to

ensure adequate water

Supply, sanitation &

drainage, etc. in

conformity with the

Indian Labour laws.

Prospective

Contractor

During

Construction

Period

11.

Procurement of

Construction

material

a. Procurement of

construction Material

only from permitted sites

and quarries

Construct

Management

Consultant/

Prospective

Contractor

During

Construction

Period

12. Laying of

Feeder mains

a. Water supply line and

feeder main route should

be realigned wherever

possible to minimize tree

felling.

b. Should not involve

resettlement

c. While crossing settlement

or inhabited areas prone

to water logging, external

casing to water mains is

to be provided

d. Feeder mains as far as

possible, should be laid

within right of way.

e. Laying in encroached

area (or) narrow is to be

avoided

Construction

ManagementConsultant/

Prospective

Contractor

-----do-----

During

Construction

Period

--------do---------

13.

Laying of

Distribution

System

a. Adequate precautions

should be

b. Taken while laying the

water supply Lines to

avoid possibility of cross

Construct

Management

Consultant/

Prospective

Contractor

During

Construction

Period



174

Sl.


Responsible

Agencies

Time Frame

For

Implementation

connection with the sewer

lines

14. Risk of accidents

a. In order to guarantee

construction safety,

efficient lighting & safety

signs shall be installed on

temporary roads during

construction and adequate

traffic regulations shall be

adopted and implemented

for temporary roads

b. During construction,

effective safety and

warming measures shall

be adopted to reduce

accidents.

c. Provide temporary

crossings / bridges

wherever necessary to

facilitate normal life and

business.

d. Where loose soil is met

with, shoring and

strutting shall be provided

to avoid collapse of soil

Prospective

Contractor

-----do-----

-----do-----

-----do-----

During

Construction

Period

------do----------

------do----------

------do----------

15.

Traffic and

Transportation

a. Use major roads to avoid

traffic congestion and

insist on compliance by

the Contractor

b. Local construction

materials, especially earth

and stones shall be used

as much as possible to

avoid long distance

transportation

c. Adequate actions to direct

and regulate traffic shall

be taken in consultation

with CCC to prevent

traffic jamming of roads

during construction

period. While planning

alternative routes, care to

be taken to minimize

congestion and negative

impacts at sensitive

receptors such as schools

and hospitals.

d. Traffic controls and

Prospective

Contractor/

CCC

-----do-----

Traffic

Police /

CCC

Prospective

Contractor / CCC

During

execution

of the Project

--------do---------

--------do---------

-------do----------



175

Sl.


Responsible

Agencies

Time Frame

For

Implementation

diversions marked with

signs, lights and other

measures (flags) should

be provided

e. Prior to creating

diversions and detours the

citizens should be

consulted well in advance

through citizens

meetings. It should be an

informed decision taken

through public

participation

f. Diversion works to be

dismantled to restore the

area to original condition

after completion of

construction

Prospective

Contractor

--------do-----

-------do----------

--------do--------

16. Cultural Relics

a. If fossils, coins, articles

of value or antiquity,

structures and other

remains of geologic or

archeological interest are

found, the local govt.shall

be immediately informed

of such discovery and

excavation shall be

stopped until

identification of cultural

relics by the authorized

institution and clearance

is given for proceeding

with work

Prospective

Contractor

During the

Construction of

the Project

17. Environmental

Pollution

a. Explore the possibility of

reuse of back wash water

Construct

Management Contractor

During Project

Construction

a. Prevent loss of

Disinfectant and other

chemicals and ensure

prescribed safety

measures for their

storage, handling and

application

Construct


/

CCC

During Project

Construction /

Operation

18. Other items

a. Implement a well-planned

Programme on human

resource Development

aimed at increasing The

competence and

capabilities of Technical

and administrative

personnel at all levels.

Construct


During

execution

and maintenance

period



176

Environmental Management Plan - Operation Phase Impacts

Sl.


Responsible

Agencies

Time Frame

for

Implementation

1.

Water Quality

Monitoring

Influent and Effluent at the existing

Water treatment plant

Monitoring Parameters

SS monitoring frequency –

daily

Silver Ionisation Solution –

weekly

Monitoring points – at the inlet

of treatment plant and treated

effluent.

Complete physico-chemical

analysis including heavy

hardness, fluoride. Monitoring

frequency: once a month

CCC

CCC

During the life

of the project-

collect and analyze

samplesonce every

week

Take corrective

action within a

week

Once a month.

Take corrective

Action within a

week

2. Noise monitoring

Operation period: 4 times a year

Monitoring will be undertaken as

appropriate at the sump cum pump

arranegments

CCC During the life of

the project.

4 times a year.

Take corrective

action in 3

months

2.10.11 Environmental Monitoring

The monitoring activity in the context of the project would be at three levels:

Routine monitoring of the performance of the water supply system will be by the prospective

contractor to ensure that the system is being operated and maintained in conformity with the

applicable quality standards.

Compliance monitoring by the Municipal Corporation/Project Monitoring Consultant to ensure

that the proposed environmental management plan is being implemented. In the event of any

violation of standards observed, it would be the responsibility of the Municipal

Corporation/Prospective Consultant to ensure immediate rectification.

Monitoring the trend in the performance of the project in terms of the services committed by the

municipality to the beneficiaries as well as the environmental quality of the project area. This

monitoring that would be done by Municipality will attempt to evaluate the extent of benefits that

the consumers have accrued from the project. Additionally, if this monitoring reveals that any

modifications are required in the project design to maximize the benefits, municipality would

implement them.



177

Institutional Arrangements required

Having a Monitoring Agency to monitor environmental quality.

Review of outputs of the monitoring agency

Rationalise the environmental monitoring process.

Prepare Annual Environmental & Social Audit Report & Environmental Compliance Report.

Monitoring at this level would also be a form of disclosure monitoring used to keep the beneficiaries

of the project informed about its progress.

Implementation of mitigation measures may also sometimes give rise to impacts, which will be

recognized early if rigorous monitoring is ensured. The monitoring plan should also provide for

periodic revision of the measures. The plan is described in following Table covers the monitoring

requirements at all levels during operation phase. It provides the monitoring requirement for each

impact/issue identified earlier and the responsible agencies.

Environmental Management Plan - Construction Phase Impacts

Sl.

No. Monitoring Requirement Specifications

Responsible

Agency

1. a. Ambient air quality at six fixed

stations to understand the

impact of change in traffic

pattern due to the project

b. Moving Station (1 no.) at the

construction site (only during

construction period) to

understand the impact of

construction operations.

SPM, Oxides of Nitrogen, CO,

Co2

SPM, Oxides of

Nitrogen, CO, Co2

Coimbatore City

Corporation

Coimbatore City

Corporation

2.

Noise levels at the construction

sites (only during construction

period)

Fortnightly monitoring at 2

locations, hourly basis for 24

hour period.

Coimbatore City

Corporation

3. Disposal of Construction Debris

Periodic inspection at

2 locations on hourly basis for

24 hour period.

Coimbatore City

Corporation

4. Traffic and Transportation

Measures for diverting the traffic

during construction across

district roads and roads within

the Municipal Corporation

Coimbatore City

Corporation (once

a week)

5.

Domestic Sewage and refuse

management at the labour camps

and construction sites

Check for adequacy of sanitation

arrangements at the labour

camps

Coimbatore City

Corporation (once a

week)

6. Water Pollution

Check for

a. blockage of flowing water

which may lead to stagnation

of water

Coimbatore City

Corporation (once

in 15 days)



178

Sl.

No. Monitoring Requirement Specifications

Responsible

Agency

b. soil erosion due to

construction activities leading

to contamination and siltation

of water bodies

c. water contamination due to

use of fuel and lubricants at

the construction sites

7. Procurement of construction

material

Procurement from be only

permitted sites

Project

Management

Consultant

Environmental Management Plan - Operation Phase Impacts

Sl.

No. Monitoring Requirement Specifications Responsible Agency

1. Water Quality at Service

reservoir

a. Monitoring parameter: Chemical

Quality: Monitoring point - At

outlet of MSR, SRs

b. Monitoring Frequency: 2

locations & 3 samples per

location

Coimbatore City

Corporation

2. Water Quality at Consumer

end

a. Monitoring Parameter:

Bacteriological quality &

Residual Chlorine - Monitoring

point: At receiving point of the

consumer

b. Monitoring frequency: Weekly

Coimbatore City

Corporation (once a

week)

2.10.12 Impact during Design Phase

The major impact associated with Design or Pre-construction phase deals with loss of land, loss of

natural habitat, loss of properties and livelihood due to acquisition of properties. The design of

alignment also decides the acquiring or impacting water-bodies, forest, cultural sites etc. The Design

phase takes into account these issues along with environmental and social specialists to minimize the

impact. Besides the impact on environment and social factors, other issues were also considered like

legal issues and compliance norms, to facilitate the implementation process.

For the present project there will be no new requirement of land to be procured, as new service

reservoirs, underground sumps etc., will be accommodated in the corporation land already available.

New main pipeline will be in the same alignment as that of the existing ones, however the additional

line for the distribution will be along the road where there is enough apron land. Desilting wastes will



179

also be used in bank strengthening as well as replenishing the top soil in the downstream. Thus new

land acquirement will not be necessary.

2.10.13 Impact during Construction Phase

1) Land

As no new possession of land is required there will not be any displacement or loss of livelihood

for local population.

Potential Land Impact Issues


Service Reservoirs Corporation Land No major impact

Underground Sumps Corporation Land No major impact

Pipe line laying Road side and vacant land No major impact

Mitigation Measures

Proper spraying of water in selected areas and proper storage, refilling and compaction of excavated

soil can mitigate the impact. Workers should use mask or cover nose with cloth to reduce the impact

of dust pollution. Also, the area where the excavation will be carried a 2 mts height separator will be

erected.

2) Water Resources The other impact on water resources is the requirement of water for

construction purpose. Water will also be required for dust suppression. Drinking water will be

required for the workers working at the construction site. The water requirement for all these

purposes may have an impact on local water resources and water availability for the local people.

This can also have impact on water requirement for local domestic animals. The development

process should take account of this water requirement and should arrange for that.

Potential Water Resources Impact Issues


Service Reservoirs &

Underground Sumps

All project locations Deposition of debris

Pipeline laying Crossing drains, channels Depositing debris

Water requirement for

Construction Work

All project locations Impact on local water

availability

Mitigation Measures



180

Construction procedures will take care for management of debris. Project authority will arrange for

excess water requirement beforehand to avoid any later crisis. Silt disposal will be planned and

phased in the downstream channel.

3) Flora and Fauna

Since the project area lies well within the City limits of Coimbatore Corporation, there will not be any

significant effect on vegetation and habitation. So construction will not cause any impact on flora

there. Removal of these also for a few meters of wide corridor, would not cause any significant

impact.

Mitigation Measures

All the trees removed in the exceptional cases, will be replaced by planting at least three times the

number of trees cut. The project therefore will take some specific steps for ensuring ecological

balance.

Fauna

Construction of intake well will cause some temporary impact on aquatic ecology. There will be some

temporary impact on the wild fauna living on the shrub jungles on the reservoir & river bank and on

fallow lands during construction work.

Potential Impact on Flora and Fauna


Construction of Service Reservoirs Corporation reserved site Impact on flora.

Underground Sumps Corporation reserved site Impact on flora.

Pipeline laying Along Roadside Impact on flora.

4) Construction Workers’ Requirements

This activity covers the arrangement for housing and living requirements for the construction workers.

There is a possibility that some of them will be coming from beyond immediate neighborhood. The

contractor will be asked to provide suitable camps for their work force and make provision for

insurance for any eventuality. If the construction workers stay near the site, they will be provided

with safe drinking water and proper sanitation facilities. The workers will be provided with fuel in

order to avoid cutting of trees in the neighborhood for their fuel need.



181

2.10.14 Impact during Operation Phase

Operation of water collection, storage and supply will generate solid, liquid and gaseous effluents.

Their impacts are discussed below.

1) Air Quality

During normal operation of water supply scheme, there will be no generation of gaseous effluents and

thus no impact on air quality.

However if DG sets are used for emergency activities during power cut, then the impact on air quality

should be considered. In that case proper height of exhaust, acoustic cover etc. as per acts will be

followed.

2) Noise

Generally there will be no noise pollution during the water supply for the people outside. The DG set

used for the emergency operation will be silent eco-generator sets.

3) Effluent generated from additional water supplied (Sewage contribution)

Under the scope of this project, there is expected to be an impact on the volume of waste water

generated after implementation of the water supply augmentation works. The additional quantity of

water to be supplied in future will trigger an additional load on the sewerage system and hence this

will have to be factored in the proposed sewerage project.

Therefore, the sewerage infrastructure of the CCC has to be improved to meet the impact of the

project water supply augmentation. A Sewerage project has been proposed which includes laying of

sewer network, intermediate pumping stations and road restoration works. In addition to the above

proposal, it is proposed to construct 100 Nos of Public toilets across various locations in the city units

for enhancing the sanitation facilities.

Reuse of treated sewage effluent for irrigation purpose, financial resource generation from sewage by

selling the sludge to farmers as manure, private sector participation in monitoring the sewage &

effluent treatment units has been listed in the City Development Plan for Coimbatore.

2.10.15 Impact Identification Matrix

Relevant components of environment, which are likely to experience some impacts due to the project

activities, have been identified above. Environmental parameters are broadly classified under two

groups:



182

1) Physical Environment

2) Biological Environment

The parameter selected for impact identification is site and project specific. Different parameters

considered under the said groups are as follows:

Topography

Hydrology

Water Quality PHYSICAL ENVIRONMENT

Air Quality

Noise and

Flora

Fauna BIOLOGICAL ENVIRONMENT

Aquatic Life

The interaction between project activities (construction and operation phase) and environmental

parameters described above are shown in the following table depicting Identification matrix. The

matrix points out each activity and its impact on specific environmental parameters. This is a

qualitative work and does not indicate quantitative impact. Some of the impacts are temporary and

localized and some impacts have permanent effect.

Environmental Impact Matrix

ACTIVITY

PHYSICAL ENVIRONMENT

ECOLOGICAL ENVIRONMEN

T

Topo graphy Hydro logy Water Quality

Air Qualit

y

Noise

Flora Fauna Aquatic Ecology

Construction Phase

Construction of Service Reservoirs

X X X X

Construction of Underground Sumps

X X X X X

Pipeline laying X X

Construction Workers’ Requirement

X X

Operation- Phase

Gaseous Effluent from DG Set

X



183

2.10.16 Environmental and Social Classification

As per environmental and social screening, this project is classified under S-3 category. The

implication is that there are no households involved and the number of project affected persons (PAP)

is nil. As per environmental categorization of urban infrastructure projects, water supply project fall

under E-3 category.

2.10.17 Specialized Services for PMC and Quality Assurance

Typically, it is envisaged that the PMC works and associated components namely Capacity Building,

Institutional Strengthening, IEC activities, Transaction costs will approximately work out to 5% of the

total Project Cost. However on the ground level the project “may” require some further investigation

on technical and institutional part during implementation phase. A special fund provision for this will

be made in the budget.



184

3 Project Cost

3.1 Basis of Costing

The cost estimate for the water supply improvement is prepared based on the following references:

TWAD Schedule of Rates for the year 2014-2015

Lead Statement and Rate Analysis of Coimbatore Corporation

3.2 Land acquisition / Site Development

Based on the data provided by the Coimbatore City Corporation, land availability for all the

components are investigated and identified for availability. The land details such as survey number,

extent of land available are furnished in Table No.2.51 Volume I (a), Report part of this DPR.

3.3 Physical Infrastructure Component Cost

A summary of the physical infrastructure component costs estimated for the proposed improvements

is presented in Table No. 3.1 as below.

GENERAL COST ABSTRACT

Coimbatore Water Supply System - Revised Final DPR (Schedule of Rates 2016-2017)

Sl

No Description

Base Cost of the

Project

Base Cost of the

Project (Rs in

Lakhs)

I Feeder Mains, Sumps & Pump Room, Pumpsets &

Generators

A. Feeder Mains

1 Pillur System

a) Feeder Main I from Proposed MSR at Ramakrishnapuram to

Proposed SR at Bharathi Nagar (Gravity) – 33.20 Kms 26,57,43,583 2657.44

b)

Feeder Main II from Existing MSR at Ramakrsihnapuram to

Proposed SR at Lakshmi Nagar Mill Colony (Gravity) –

28.41 Kms 34,03,22,554 3403.23

c) Feeder Main III from Existing MSR at Ramakrishnapuram to

Proposed sump at Rakkatchi Garden (Gravity) – 2.37 Kms 1,53,97,395 153.95

d) Feeder Main IV from Proposed Sump at Rakkatchi Garden to

Existing SR at Jai Nagar (Pumping) – 9.98 Kms 4,05,24,788 405.25

2 Siruvani System

a) Feeder Main I - From Existing MSR at Bharathi Park to

Proposed SR at Housing Unit (By Gravity) – 13.82 Kms 12,50,49,275 1250.49

b)

Feeder Main II - From Existing MSR at Bharathi Park to

Proposed Sump at Sanganur Chinthamani (By Gravity) –

1.36 Kms 2,06,33,654 206.34



185



c)

Feeder Main III - From Proposed Sump at Sanganur

Chintamani to Existing SR at Revathi Layout (By Pumping)

– 7.53 Kms 2,52,53,203 252.53

3 Interlinking of MSR of Pillur & Siruvani System

From Existing MSR at Ramakrishnapuram to Existing GLSR

at Bharathi Park – 8.44 Kms 12,55,42,325 1255.42

Sub Total Rs in Lakhs (I - A) 95,84,66,777 9584.67

B. Sumps & Pump Rooms

1 Pillur System

10.00 LL Sump at Rakatchi Garden with Pump Room – 2

Nos ( 8m x 8m x 5m Size) with Ladder and Pipe Connection

Works 1,14,43,476 114.43

2 Siruvani System

7.00 LL Sump at Sanaganur Chinthamani with Pump Room -

1 No (8m x 8m x 5m Size) with Ladder and Pipe Connection

Works 75,18,714 75.19

3 Interlinking of MSR of Pillur & Siruvani System

10.00 LL Sump at Bharathi Park with Pump Room – 1 No

(20m x 10m x 6m Size) for MSR Interlinking with Ladder

and Pipe Connection Works 1,35,54,688 135.55

Sub Total Rs in Lakhs (I - B) 3,25,16,878 325.17

C. Pumpsets & Generators

1 Pillur System

At Rakatchi Garden - 5640 Lpm x 27 m x 44 HP - Horizontal

Split Case – 2 Nos (1W+1S) & 5460 Lpm x 49 m x 78 HP -

Horizontal Split Case – 3 Nos (2W+1S) & 200 KVA Diesel

Generator Set

1,62,21,418 162.21

2 Siruvani System

At Sanganur Chinthamani – 960 Lpm x 20 m x 6 HP –

Submersible – 2 Nos (1W+1S) & 2580 Lpm x 27 m x 20 HP

– Submersible – 2 Nos (1W +1S) & 4080 Lpm x 35 m x 42

HP – Horizontal Split Case – 3 Nos (2W +1S) & 80 KVA

Diesel Generator Set

95,39,146 95.39

3 Interlinking of MSR Pillur & Siruvani System

At Bharathi Park – 17400 Lpm x 24 m x 122 HP – Horizontal

Split Case – 3 Nos (2W+1S) & 250 KVA Diesel Generator

Set 1,36,22,880 136.23

Sub Total (I - C ) Rs in Lakhs 3,93,83,444 393.83

Sub Total (I) Rs in Lakhs = A + B + C 103,03,67,099 10303.67

II Distribution System & Special Components

A. Distribution System

1 North Zone (27 Zones of 407 Kms) 45,50,88,712 4550.89

2 South Zone (15 Zones of 195 Kms) 25,25,29,718 2525.30

3 West Zone (28 Zones of 308 Kms) 47,35,40,931 4735.41

4 East/Demo Zone– I (8 Zones of 107 Kms) 15,42,84,727 1542.85

5 East/Demo Zone–II (23 Zones of 324 Kms) 40,48,57,964 4048.58

Sub Total (II - A) Rs in Lakhs 174,03,02,052 17403.02



186



B. Special Components

1

Automatic Hand Held Meter Reading System (5 Nos – 1 No

for each Zone) & Data Collection Software (5 Nos – 1 No for

each Zone ) 1,28,00,000 128.00

2 Any Time Payment Machine (5 Nos – 1 No for each Zone) 25,87,500 25.88

3

Bulk Water Meter with Data Logger for Flow & Pressure

Measurment & Pressure Control Valve & Data Logger Room

(101 Nos – 1 No for each D’System Sub Zone) 27,10,52,694 2710.53

4 Gas Chlorination Disinfection (2 Sets – 1 No for each MSR) 1,08,32,756 108.33

5 House Service Connection Meters (75,000 Nos as AMR

Meters) 117,81,97,500 117,81.98

6

Rider Mains of 90 Kms Length in all 5 Zones (23 Kms in

North Zone, 11 Kms in South, 30 Kms in West, 9 Kms in

East Zone I & 17 Kms in East Zone II) 2,92,61,141 292.61

Sub Total (II - B) Rs in Lakhs 1504731591 15047.32

Sub Total (II) Rs in Lakhs = A + B 324,50,33,643 32450.34

III Service Reservoirs & Pipe Connections

A. North Zone

20 LL – 15 m Staging Height – 2 Nos 5,54,64,208 554.64

20 LL – 12 m Staging Height – 1 No 2,36,00,026 236.00




Sub Total (IV - A) Rs in Lakhs 16,90,08,303 1690.08

B. South Zone

19 LL – 15 m Staging Height – 1 No 25,849,737 258.50

16 LL – 15m Staging Height – 2 Nos 51,613,019 516.13

12 LL – 15m Staging Height – 1 No 18,077,404 180.77




Sub Total (IV - B) Rs in Lakhs 122,141,100 1221.41

C. West Zone





Sub Total (IV - C) Rs in Lakhs 12,45,71,076 1245.71

D. East / Demo Zone I


Sub Total (IV - D) Rs in Lakhs 2,48,52,448 248.52



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E. East / Demo Zone II



11 LL – 15m Staging Height – 3 Nos 4,22,74,813 422.75

10 LL – 15m Staging Height – 2 Nos 2,53,22,119 253.22

4 LL – 15m Staging Height – 1 No 56,88,284 56.88

Sub Total (IV - E) Rs in Lakhs 11,61,13,852 1161.14

Sub Total (IV) Rs in Lakhs = A + B + C + D + E 55,66,86,779 5566.87

IV Common Components

1 Water Quality Test Laboratory & Equipments (1 No) 56,16,817 56.17

2 SCADA System for Monitoring (1 No) 7,53,72,000 753.72

Sub Total (III) Rs in Lakhs 8,09,88,817 809.89

Project Sub Total Rs in Lakhs = I + II + III + IV 491,30,76,338 49130.76

Project Management Consultancy Cost 16,21,00,000 1621.00

Physical Contingencies at 3% on Project Sub Total 14,73,92,290 1473.92

Project escalation cost for 3 years LS 31,85,65,990 3185.66

Administrative Charges at 0.5 % on Project Sub Total 2,45,65,382 245.65

Total Project Cost Rs 556,57,00,000 55657.00 Lakhs

Total Project Cost Say Rs 556,57,00,000 556.57 Crores

3.4 Rehabilitation & Resettlement Cost

Out of the activities listed above, construction of sump cum pump houses, service reservoirs will be at

the reserved sites of the Coimbatore Corporation. Hence there is no land acquisition envisaged. Thus,

re-settlement and re-habilitation is not foreseen. Distribution mains are generally laid along the

roadside in the town and hence there is no rehabilitation and resettlement involved in this also.The

cost of road crossing and railway crossing is factored in the cost components.

3.5 Project Costing

Project Cost has been estimated based on 2013-2014 Schedule of Rates.The total project Cost of the

water supply improvements is presented in Section 3.4 as above. The Detailed Estimates, Cost

Abstracts of the designed components and Rate Analysis has been furnished in Volume IV, part of

this DPR

Annual Operation and Maintenance Costs

The annual Operation and Maintenance cost for the project is estimated under the following

expenditure heads:

Establishment Charges

Energy Charges and

Repairs / Renewals including Consumables like chemicals, etc.,



188

Maintenance expenses incurred by components like ATP Machine, etc.,

Establishment charges are calculated based on the staff strength required as per the norms stipulated

in the CPHEEO manual for water supply and furnished as below in Table No. 3.2

Staff Pattern (as per CPHEEO Norms) (Only for Distribution System)

Sl

No Category of Staff

Num

bers CPHEEO Norms

1 Valve Operator for 2 MSR (2 Nos) 4 Nos 2 x 2 shift

2

Supervisor / Asst Manager - Pillur

Mains I, II,III & IV and Siruvani

Mains I, II, III

7 Nos 1 No for each network

3

Fitters for Pumping main

Pillur - 9.98 Km & Siruvani - 7.53

Km

6 Nos 2 nos for every 6 km

Fitters for Gravity main

Pillur - 63.98 Km & Siruvani - 15.19

Km

MSR Interlinking - 8.44 Km

29

Nos 2 nos for every 6 km

Fitters for MSR & Sump cum

pumping arrangements 8 Nos 4 x 2 shift

4

Electrician / Mechanic (2 MSR + 2

Pump cum sumping - 1 for MSR + 1

for PS)

4 Nos 2 x 2 shift

5 Helpers (Mazdoor category grade I)

for Distribution system (101 zones)

101

Nos 1 no for each zone

6 Watchman for Service reservoir (63

Nos)

126

Nos 1 no x 2 shift

Watchman for MSR (2 MSR - 12 hr

shift - 2 shifts/day) 4 Nos 1 no x 2 shift

7

Billing & Collection of water charges

a) Water Meter Reader to read 1.5

Lakhs Connection

300

Nos

One for every 500 connection to be read

monthly or a minimum of one if less than

500 connection (includes leave reserve / shift

duty also)

8 c) Water rate collectors to collect

rates for 1.5 Lakhs Connection

100

Nos

One for every 1500 monthly billed

connections

9 d) Water rate superintendent for 1.5

Lakhs Connection

25

Nos

One for every 6000 billed connection

monthly

10

e) Meter repairer (assuming 5% of

meters fails per month = 150000 x

0.05 = 7500 nos)

94

Nos

One for every 80 meters per month to be

repaired

11 f) Assistant meter repairer 94

Nos

One for every 80 meters per month to be

repaired

12 Water Analyst (Chemical) 1 Nos

13 Water Analyst (Bacteriological) 1 Nos

14 Laboratory Technician 3 Nos

15 Typist cum Clerk 1 Nos

16 Water Sample Takers 3 Nos

17 Laboratory Cleaners 3 Nos

18 SCADA Operators (Techncial) for

entire Scheme at Central Control 3 Nos 1 x 3 shifts



189

Staff Pattern (as per CPHEEO Norms) (Only for Distribution System)

Sl

No Category of Staff

Num

bers CPHEEO Norms

room

Cost for O&M including establishment charges as per norms listed above, electrical energy charges

including KVA charges and meter rent, cost of fuel required for DG sets, repair and renewal charges,

cost of chemicals / disinfection unit, cost for maintaining SCADA equipments, Any Time Payment

Machines, etc., are arrived at Total O&M cost which works out to Rs 38.69 Crores per annum. This

works out to 8.06% of the total installation cost of Rs. 479.64 Crores. Item wise break up is listed in

Table No.3.3

Table No. 3.3 - Abstract Cost of O&M per Annum (D’System Only)

Sl No Description Amount (Rs)

1 Cost of Establishment 93,907,383

2 Cost of Electrical Energy 275,073,043

3 Cost of Diesel for DG Set 8,244,000

4 Cost for Gas Chlorine Disinfection unit 5,862,724

5 O & M for SCADA System 753,720

6 O & M for ATP Machines 3,105,000

Total (per annum) for 290 MLD 386,945,870

Say (per annum) for 290 MLD 3869.46 Lakhs

Say Rs per KL per annum 1334.296

Say Rs per KL per day 3.66

3.6 Institutional Strengthening

The strength and weakness of each of the staff working in the CCC for O & M, are reviewed with

reference to their experience and level of skills required to ensure effective O&M of the system. As

there is enough scope for further improvements, it is suggested to impart regular refresher

programmes at all levels so that the staff concerned can unlearn the misconception and relearn the

required skills to perform better.

3.6.1 Training to be imparted

Existing / Proposed staff in the CCC needs to be educated / trained in the following fields

1. Training on supervisory control and project management for the work of the execution of

water supply components such as feeder mains, pumping mains, master balancing reservoirs,

service reservoirs, distribution system & other related civil construction activities.

2. Effective O & M practices for a water supply project

3. Preventive and regular maintenance of pumps, valves, equipments and instrumentation

provided in the system.



190

4. Preventive measures for corrosion related issues of water mains.

5. Communication & Public relations.

6. Training to handle field kits for testing of water quality.

7. Training for Fitters / field workers to provide new house service connections with MDPE

pipes and electro fusion saddle pieces.

8. Training for field staff in maintenance of the water supply distribution net works with

equitable pressures and design concepts for extension of distribution networks.

9. Training for handling leak detection equipments and SCADA.

10. Training for handling special equipments like Automatic Meter Reading (AMR) system, Any

Time Payment (ATP) machine, Water meter test bench, Automatic Pressure Management

System (PMS), Billing & Collection software systems, etc.,



191

4 Project Institution Framework

4.1 Roles of Different Institutions

Fulfillment of the objective of increased hours of water supply with high level of consumer

satisfaction calls for substantial capital investment with legal covenants on the rehabilitation of

distribution system including service lines and consumer metering, preparation of accurate network

maps and data bases, installation of state of the art computer hardware and software etc. (to integrate

water demand assessment, asset management, consumer billing, day to day O&M, Costumer Relation

Management etc.) It also calls for highly efficient and focused management of complete water supply

distribution system that would ensure non-revenue water to be within desired limits and delivery of

water to consumers at the lowest unit cost. With the present organizational set up and skill levels

available with the O&M staff, managing an efficient service delivery for the water supply system

departmentally and to achieve the target of continuous water supply within specified time frame and

at lowest costs will be difficult.

Therefore, the private sector’s involvement in Water Supply service delivery system is imperative to

create a synergistic situation with the objective to provide better service to the consumer and cover all

section of the society, by rational tariff structure. We propose Private Sector involvement to seek

investment in

Refurbishment / Management of the Distribution Network for improved system performance.

Within the provisions of public-private-partnership mechanisms, it becomes imperative to identify the

roles of various stakeholders in the development particularly with respect to design, construction,

development, financing and maintenance of the project.

The Project construction is envisaged to be carried out on Public-Private Partnership model both by

being tendered out under the supervision/management of the ULB and also through a separately

established legal entity/project implementation company such as an SPV (Special Purpose Vehicle) if

required.

This project implementation is envisaged to be governed through specific transaction framework,

which shall involve:

(a) Devolution of responsibility to the relevant entity in order to engineer, detail design,

construct, implement, operate & maintain the project in the holistic way.

1. Ensure contractors capability to deliver in terms of construction & operations management



192

2. Setting up of framework to ensure that contractor functions as per committed performance

requirements for the project within the legal system.

3. Balancing public and private interests for infrastructure provision, fund availability and project

implementation to bring capital efficiency.

4.2 Roles and Responsibility Matrix

4.2.1 Role of the Government of Tamilnadu (GoTN)

The main role envisaged for Government of Tamil Nadu would be to provide financial assistance of

20% for the project implementation, inter-alia, other necessary facilitation from other relevant Central

and State agencies such as the Railways, Roads, Water resource development authority etc. Thus, the

State government is expected to act as an enabler to this project development and having supervising

authority being stakeholder.

4.2.2 Role of the Coimbatore Water Supply Sector

The role of water sector is to act as an enabler in bringing different agencies involved in the service

delivery to a common platform and ensure efficiency and financial viability of the agencies in the

water supply system. Also, delegating to the private sector the responsibility for time-bound,

qualitative and efficient project implementation. They would also be the prime body dealing in

necessary co-ordination/ facilitation as required between various departments such as numerous

utilities that co-exist in the project influence area etc.

The water sector is envisaged to operationalize the Special Purpose Vehicle (SPV) and will have full

control over the functioning of the SPV including the operationalization of the Escrow Account.

The key functions of the water sector in the corporation can be broadly categorized into two, namely,

1) Strategic Functions

2) Operational Functions

1. Strategic Functions

To set tariffs according to general policy rules and contractual terms;

Environment regulation for the Integrated management of water resources in the

Corporation Area;



193

Finalization of the terms and conditions of the different contractual arrangements for service

delivery of Water;

To enter into Contractual/Concession Agreements with SPV;

Formulation of the SPV’s and decide on their Equity Holding Patterns;

Activation of the Escrow Account if necessary;

To regulate all investment Decisions;

Operational Functions

To set and enforce service quality standards;

To monitor and enforce drinking water standards;

To deal with customer complaints;

To regulate bulk supply agreements, if they exist;

4.2.3 Role of the Coimbatore City Corporation (CCC)

The Coimbatore City Corporation (CCC) is envisaged with the role of the “Owner” of the project,

with 30% of the Financing to be sourced from and private sector involvement through BLT

mechanism under PPP. It will be the responsibility of the Private operator for the efficient project

implementation as well as meeting different performance indicators e.g Quality, Delivery,

Productivity etc. CCC is also expected to put in place necessary processes required for public

awareness and participation in order to ensure minimum disruption of normal life of the public while

the water supply augmentation activities are being carried out including setting up of help desks etc. A

program related to IEC will be initiated for generation of public awareness.

Here it is pertinent to note that the project will be implemnted by the PMC company which will

ensure the qulity and timely implementation of the project. After the completion of the project the

Management Contractor will take over the project for the day today operation of the Water

Distribution System.

4.3 Overall Financial Structuring of the Project

As per the guidelines of JNNURM, cities having population between 1 - 4 Million would get 50%

grant from Central Government. 20% grant from the State Government and the rest 30% have to

arranged by ULBs through various sources as Devolved Funds, surplus resources, Debt/ Term Loan

or Private Equity/ Community Funding etc.

Accordingly for the Coimbatore City Corporation with more than 1 Million Population, the City is

eligible for receiving 50% of project implementation cost as grant from the Central Government



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Funds. Further, the State Government of TamilNadu shall ensure 20% of funds towards its

contribution. Coimbatore City Corporation shall arrange the rest 30% of funds through PPP by

strategically entering into agreement with the private player.

Cost estimates for Re-structuring of existing water supply system comprising replacement of existing

distribution mains and replacement of pumps and accessories and Augmentation works for the water

supply reveal that the project requires an investment of 479.64 Crores during the two subsequent

financial years. It includes the cost of construction, consultancy services during design and quality

assurance/ supervision charges during construction period, cost of civil works and the cost of

shifting/crossing the utilities.

Based on the availability of funds from various sources for implementing the proposed Coimbatore

Water Supply Scheme, following financial structuring is evolved for the project.

Overall Financial Structuring of the Project

SN Govt.

Project

Contribution

Source

Amount

(in Rs.

Crores)

% share

by

specific

source

%

share

by

govt.

entity

Remarks on when

and how state and

ULB shares would be

arranged

1. Central ACA Grant 278.29 50% 50% Not Applicable

2.

State

Grant towards its

share in the project

111.31 20% 20%

After the approval of

the Project the Govt. of

Tamil Nadu will take

expeditious action for

allocating the

necessary funds

3.

Loan taken by state

Govt. towards its

share in project

4. ULB

Private equity/

community resource

funding; others

166.97 30% -

If necessary loan will

be taken from

government financial

institutions

Total Project 556.57 100%



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5 Project O&M Planning

5.1 Institution Framework (Organization & Operations) Strategy

In the CCC administered area, it is proposed that the different type of PPP framework will be used for

bridging the financing gap as well as managerial skill. The detail of the institutional framework as

well as the operational module has been discussed in detail in chapter 5. The further refinement of the

O&M process will be developed during the implementation phase but the basic feature will remain the

same and will follow the roadmap illustrated as per CPHEEO norms. However for clarity the O&M

Plan is discussed in detail, which is as follows.

5.2 Selection of O&M Operator

It is diligent to deploy a Management Contract Operator to maintain the assets related to Water

Supply more fully discussed in Chapter-5 of this DPR. It will be responsibility of the Operator to

design an efficient operation and maintenance mechanism to achieve the desired level of efficiency

and service delivery during the contract period. In the context of this project, the ambit of O&M

framework commences from the time the Project is commissioned. Besides a responsibility of an

Operator who will have a dedicated O&M load, there are as set of responsibilities vested on the part

of the CCC on preventive and regular maintenance aspects which will have an impact on the service

delivery levels.

5.2.1 Preventive Maintenance

Preventive maintenance of a water supply system is a set of activities that are to be performed on a

regular basis. This has a marginal bearing on the initial project cost, but will result in economical

maintenance of the system over the project life. In the water distribution network for CCC area,

proper maintenance will enhance the serviceability of the life of water mains and appurtenances

which in turn will assure regular and uninterrupted water supply to consumers. The capital cost to be

incurred in this proposed project for both rehabilitation works and augmentation of new system

should have an appropriate O&M framework in place including both capacity and institutional related

issues.

Maintenance issues in pipelines differ from place to place depending on the conditions encountered.

Selection of suitable pipe material and periodical maintenance is essential to ensure that the public

receives protected water supply at the most economical rate with minimum breakdowns. This shall

ultimately manifest itself as consumer satisfaction. Following are some of the important points to be

considered while planning based on the CPHEEO guidelines:



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Annual Periodic inspection of mechanical / electrical equipment such as pumps, valves,

capacitors, voltage stabilizers for trouble-free operation and optimum performance.

Materials of superior quality shall be examined and implemented accordingly – A log of such

reports has to be documented and archived for evolving a proper Database Management

Mechanism.

Newly laid mains shall be regularly tested (The period and interval of testing has to be evolved in

consultation with the Operator to be hired)

Corrosion control measures shall be deployed at periodic intervals and the equipments and

appurtenances shall be inspected and coated with Anti-corrosive paints/chemicals.

A leak detection survey shall be performed at periodic intervals.

Ducts shall be provided across streets to permit laying of additional mains, if required

Provisions of stubs (short length mains) to accommodate a group of ferrule connections

Use of equipment like submersible dewatering pumps, cutting machines, pressure cutting

machines, pipe detectors, leak detectors, lighting sets, butterfly valves etc.

Preparation of manuals' with details of mains, valves, hydrants, etc. within a ward/ zone

Maintaining emergency labour teams to work on Sundays and holidays

Liaison with other utilities for proper work co-ordination and reduced interference

Adequate staff training

System of information dissemination to consumers on possible disruption in supply

Breakdown / Emergency Maintenance

In case of a damage (pipe burst) resulting on a branch main, the following operational sequence

shall be adopted:

Labour workforce (skilled & unskilled) shall be mobilised and required materials shall be

assimilated and the team shall be directed to the breakdown site.

Main control stations, senior officers concerned with maintenance and distribution shall be

informed of the situation and kept updated on progress.

The concerned control office shall be intimated to isolate the damaged main and alternative

supply arrangements (if possible tankers) shall be deployed into action.

Utilities such as Gas, Electricity and Telephones shall be informed on the breakdown and request

them to be present at site to ensure contractor co-ordination.



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Isolation of the water main by closing sluice values on both the sides. This will have to be done if

the pipe is damaged severely (pipeline burst).

5.2.2 Quality of Materials

The water supply system will work without (or with very minimal) interruption if procured materials

such as pipes and appurtenances are of good and standard quality. It is therefore necessary to use

standard materials of approved make and establish procedures right from procurement of materials to

installation, testing and commissioning.

Pipes procured shall be subjected to hydraulic pressure tests as specified in IS:1536. If the testing

facility does not exist, a manufacturer's test certificate shall be insisted obtained and filed for

reference. Manufacturers shall test pipes in the presence of the representative of CCC and submit a

test certificate while delivering the pipes. Valves, hydrants and other appurtenances shall be tested

prior to installation. It is recommended to invest more in procuring good quality materials rather than

purchasing inferior materials and then incur high maintenance expenditure.

5.2.3 Maintenance of Service Reservoirs

Important aspects to be considered in the maintenance of service reservoir are:

Measurement of inflows / outflows: Supply and Discharge flows shall be measured to ensure that

they tally. Level and flow indicators/ recorders shall be functional

Structural leakage: All structural damages and leak shall be promptly repaired

External Pollution: Manhole openings, ventilation shafts and overflow pipes shall be adequately

protected and checked periodically to prevent any contaminant infiltration

General cleanliness in and around the service reservoirs should be maintained

A garden around the service reservoir may be provided for aesthetic reasons

A program to clean the service reservoir at least twice in a year shall be undertaken during non-

supply times or a facility to by-pass the water supply shall be in place

Appropriate safety measures to prevent entry of unauthorized persons shall be provided

All guide and handrails shall be maintained in a safe and firm condition

5.2.4 Maintenance of Water Distribution System

Conveyance and water distribution are items that involve substantial expenditure in a large water

supply scheme. For effective maintenance, the entire water distribution system shall be divided into

sub-zones served preferably from one elevated service reservoir. Operation and Maintenance of the



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water distribution system should be entrusted to at least a Junior Engineer who shall be the authorised

official of the controlling authority to receive and deal with complaints. Appropriate registers shall be

maintained to record complaints and track follow up action to ensure that the complaint is addressed.

If the complaint is such that it cannot be dealt with at his level, the Junior Engineer shall promptly

refer the matter to a higher authority and also intimate the action taken to the complaint. Frequent

vigilance checks in areas receiving maximum complaints shall be made an essential part of the

supervisory staff’s daily schedule of duties.

5.2.5 Duration and quantity of supply

Duration of the supply is 24 hours and the quantity proposed is 135 lpcd.

5.2.6 Quality of water received by household

Quality of water will be satisfying the water quality specified as per IS with proper disinfection.

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