planning and design of sewers using advanced techniques for proposed sewerage system of district-...

CONSULTING ENGINEERS LIMITED

PLANNING AND DESIGN OF SEWERS USING ADVANCED TECHNIQUES FOR PROPOSED SEWERAGE SYSTEM OF DISTRICT- I FOR KANPUR CITY UNDER NGRBA PROJECT

12 Dec. 2014

International Conference on Sustainable Clean Ganga Mission: Opportunities &

Challenges

BySanjay L. Lalan, J. K. Singh, A. S. Gupte

Ministry for Water Resources, River Development and Ganga Rejuvenation


INTRODUCTION

• National Ganga River Basin Authority (NGRBA) has taken up projects for “Mission Clean Ganga” under which no untreated municipal sewage or industrial effluent would be allowed to be discharged into the river Ganga by the year 2020.

• NGRBA Objective - to provide integrated sewerage system for collection of sewage and providing STP for treatment before discharging sewage into River Ganga and preventing pollution of river Ganges and for sustainable development of surrounding areas.

• NGRBA has taken up sewerage project initially in Allahabad & Kanpur cities.

• Tata Consulting Engineers Ltd. was awarded Consultancy Services for “Technical Review, Financial Analysis and Preparation of Bid Documents of projects under NGRBA for Kanpur District- I & Allahabad District- A and District- C sewerage system” in November 2011.


PROJECT DETAILS

Sub Project Area – (TCE prepared DPRs/Tenders)

11 wards of District-I in Kanpur

Sewerage District –C in Allahabad (including STP)

TCE provided handholding services, day to day interaction and technical support at Kanpur and Allahabad to UPJN for DPR /Tenders-

Balance 23 wards of District-I in Kanpur

Sewerage District -A in Allahabad


PROJECT DETAILS

Kanpur is the biggest city of the State of Uttar Pradesh and is main centre of commercial and industrial activities.

Kanpur city population - 29.42 lakhs (2011).

It is administratively divided into 6 zones and 110 wards.

As per Master Plan report, Kanpur city is divided into four sewerage districts from I to IV.

In District-I, about 70% area is sewered and remaining 30% is un-sewered. Area is 33.20 km2 and has 34 wards.

In unsewered area, local residents have own arrangement with septic tanks and the effluent is discharged into nearby drains/nala which finally discharged into river Ganga.

District-I have 25 wards in old city (inner old area) and 9 wards in north-east area and is situated on right bank of river Ganga which is mainly residential area & famous for commercial centre and reputed institutes.


KANPUR SEWERAGE MAP

KEY MAP OF SEWERAGE DISTRICTS IN KANPUR

DIST-II

DIST-I

DIST-III

DIST-IV


POPULATION AND FLOWS

DescriptionSewerage District – I, 11 wards

– Sub Project AreaPopulation(2011)

2.36 lacs

Design population (2050) 3.06 lacsDesign Flows 40.39 MLDArea covered 397 hectare

Sewerage District

Census Population

(2011)

Projected Population

(2020)

Projected Population

(2050)

Sewage Flows 2020

(MLD)

Sewage Flows 2050

(MLD)

I 9,04,280 12,11,850 21,65,601 159.96 285.86

Kanpur City:


PROJECT LOCATION – SUB PROJECT AREA

SEWER NETWORK IN PROJECT AREA, KANPUR (DISTRICT- I)


CONTOUR LEVELS OF SUB PROJECT AREA

Terrain Variation of 11 Wards in Sub Project Area, Kanpur


PROJECT DETAILS – SUB PROJECT AREA

11 wards of District –I are having narrow streets and busy and

congested area.

106km of existing sewers. Most of the existing sewers are RCC Pipes.

Large sized sewers are of Brick Masonry egg shaped sewer.

Sewage from 11 wards is proposed to be connected to trunk sewers

located along the Mall Road (Parade-Bada chauraha-Phool Bagh road)

and leading to Jajmau STP.

Old trunk sewer (1000 mm dia) and another new trunk sewer (1000mm-

1200mm-1400mm dia) along Mall Road.

Due to already defined invert levels of existing trunk sewers, the efforts

made for connecting sewers of 11 wards by gravity to existing trunk

sewers.

Sewer network was optimized using software with minimum pumping

station and avoiding deep excavation. Hydraulic design of sewers is

done using SewerCAD software.


PROJECT DETAILS

Sewage Pumping Station has been proposed near Chacha Nehru

Hospital to avoid the deep sewer excavations in downstream area.

There is a local depression in Patkapur area, where ground levels

are in the range of 119.75 to 122.00m compared to surrounding

ground levels of 124.00m. Lift Station is proposed to pump sewage

to nearby outfall.

For utilisation of existing sewers in project area, extensive survey

and data collection was carried out in the field to assess the

condition of sewers.

Interacted with ULBs for required information such as sewer

collapse, choking, overflow, etc. and verified existing alignment at

site and its connectivity.


SURVEY OF EXISTING SEWERS

Physical survey was done for obtaining details of existing sewers. The sewer

condition (including manholes) were observed physically by opening

manholes.


PROJECT HIGHLIGHTS

Existing sewers which were in good condition and laid within past

15-20 years, are utilized in overall planning and designing for next

30 years horizon. Silted sewers which are in good condition are proposed to be

used after desilting. Heavily silted sewers are being discarded. Sewers of 400mm dia. and above sizes are proposed for internal

lining by rehabilitation techniques. GRP slip lining for egg-shaped sewers Polyurea coating for circular sewers

Trenchless technology for laying of new sewers in busy road

crossings and speedy execution At narrow streets, the use of HDPE pipes and pre-cast RCC

manholes is proposed to speed up the work.


LINING OF EXISTING SEWERS AND PIPE JACKING

A – Existing sewers after desilting

B - Installing Liner

C - Rehabilitated Sewer after grouting

D – Cross section of Rehabilitated Sewer

LAYING OF PIPE USING TRENCHLESS TECHNOLOGY

ALIGNMENT CHECKING WITH LASER

PIPE JACKING


PROJECT HIGHLIGHTS

During execution stage, Contractor shall first have to carry out

detailed condition assessment survey for sewers and obtain

concurrence regarding their utilization from the Department.

Egg-shaped brick sewers are proposed to be rehabilitated with

GRP segment pipes. For this, the Contractor will require to carry

out CCTV survey, submit the assessment report and provide GRP

segment lining for identified stretches.

Similarly, for circular sewers the Contractor will require to carry

out CCTV Survey, submit the assessment report and provide

polyurea coating for identified stretches.

Wherever, existing sewers are to be replaced by new sewers, the

existing system will continue to operate by sequential

construction program and temporary pumping so as to minimize

the inconvenience to users.


MULTIPLE HOUSE CONNECTIONS WITH SINGLE ROAD-SIDE CHAMBER

DESILTING, PRECAST MANHOLES AND MULTIPLE HOUSE CONNECTIONS

PRE CAST CONCRETE MANHOLE

METHODOLOGY FOR DESILTING


PROPOSED SYSTEM

Description Kanpur City (Sewerage District – I, 11 wards)Design Year 2050Design population 3.06 lacsArea covered 397 hectareSewer Network – Proposed

Length - 62 km (RCC NP3 / HDPE PE-100 PN 6.0)Sizes – 150 to 700mm dia.

Sewage Pumping Station – Proposed

- One SPS (peak flow capacity: 9.26 MLD) - One Lift Station (peak flow capacity: 2.14 MLD)

Rehabilitation of existing sewers

- De-silting of existing sewers- 17 km (sizes– 150 to 200mm dia.)

- Rehabilitation of existing circular and egg shaped sewers- 3 km

Circular sewers sizes– 400 to 900mm dia. Egg shaped sewers sizes – 18’’ x 27’’ / 20’’ x 30’’


PROJECT HIGHLIGHTS

Prequalification and Tender documents are prepared as the World

Bank guidelines.

Prepared project level procurement plan and detailed capital cost for

the project.

Undertaken detailed financial viability analysis.

Prepared financial models for service provider in Allahabad and

Kanpur for sub project area and also a Framework for Financial

Modeling which can be applied in later stages of the project.

Project Economic analysis which included computation of Internal

Rate of Return and economic benefits by establishing baseline

terms of the amount of pollution in the river and characteristics of

the effluents.


PROJECT BENEFITS

With proposed sewerage system, Prevention of Pollution of River Ganga. Public inconvenience and traffic interruption will be minimized. Resource conservation by reducing the requirement for

procurement of new pipes. Construction time will be reduced by around 6 months by

avoiding major pipe trench excavation & laying work and

procurement of new pipes. Better environment and hygienic condition. Uplift the social standards of residents and human dignity. Avoiding the chances of damage to foundation of nearby

structure.

UPJN Kanpur DPR for remaining 23 wards (of length about

400km) is prepared on similar approach.


PROJECT COST

Sl. No.

Components Project Cost (Rs. In Crores)

1 Sewerage System in 11 wards of District-I in

Kanpur

75.01

2 Sewerage System in Balance 23 wards of

District-I in Kanpur

397.31

3 Sewerage system in District –C in Allahabad 147.67

4 Sewerage system in District –A in Allahabad 288.94

5 14 MLD STP in District –C in Allahabad 42.24

Total Project Cost 951.17


CURRENT STATUS OF PROJECT

The project has been approved by NGRBA in

Empowered Steering Committee meeting in 2014 for

implementation.


THANK YOU

planning and design of sewers using advanced techniques for proposed sewerage system of district-...

Engineering

kanpur district

sewerage project

wards of district

kanpur sewerage district

allahabad district

kanpur city population

ngrba project

mld area