project rehabilitation report of karanja dam,

Project Rehabilitation Report

of Karanja Dam, Karnataka Water Resources Department

Doc. No.: CDSO_DSR_PRR_ KA06MH0153_KaWRD_v1.0

May 2019

Central Water Commission

Ministry of Water Resources,

River Development & Ganga Rejuvenation

Government of India

THIS PAGE IS LEFT BLANK INTENTIONALLY

Quality Control:

Version Date Writers/Contributors Checked by

1 15/05/2019 Dr. Hadush S Hagos (HSH) Pankaj Kumar Awasthi (PKA Anil Kumar Verma (AKV)

Rajiv Kumar Sawarn

Issued/Copied to:

I/C Date Name Organisation

Issued 23/05/2019 Shri. Pramod Narayan Central Water Commission

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Abbreviations

DRIP Dam Rehabilitation & Improvement Project

CWC Central Water Commission

CPMU Central Project Management Unit

CSV Construction Site Visit

SPMU State Project Management Unit

IA Implementation Agency

PIC Project Identification Code

DSRP Dam Safety Review Panel

PST Project Screening Template

DFR Design Flood Review

MSL Mean Sea Level

FRL Full Reservoir Level

MWL Maximum Water Level

TBL Top Bund Level (Top Level of Dam)

MDDL Maximum Draw Down Level

LSL Lowest Sill Level

DSL Dead Storage Level

U/S Upstream

D/S Downstream

El. Elevation

L/B Left Bank

R/B Right Bank

PMF Probable Maximum Flood

SPF Standard Project Flood

CD Works Cross Drainage Works

VRB Village Road Bridge

WBM Water Bound Macadam

NDT Non Destructive Testing

DHARMA Dam Health And Rehabilitation Monitoring Application

O & M Operation and Maintenance

EAP Emergency Action Plan

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ESMF Environmental and Social Management Framework

E & S specialists Environmental and Social Specialists

HM Works Hydro-Mechanical Works

EM Works Electro-Mechanical Works

SCADA Supervisory Control and Data Acquisition System

DG Set Diesel Generator Set

MW Mega Watt

MU Million units

Ha Hectare

MCM Million Cubic Metre

Deg. Degree

Min. Minute

Sec. Second

CM Construction management

QC Quality control

m meter

m3 Cubic meter

m3/sec Cubic meter per second

Km2 Square kilometre

Mcm Million cubic meter

TNWRD Tamil Nadu Water Resource Department

TANGEDCO Tamil Nadu Generation and Distribution Corporation

KWRD Kerala Water Resource Department

KSEB Kerala State Electricity Board

MPWRD Madhya Pradesh Water Resource Department

UJVNL Uttarakhand Jal Vidyut Nigam Limited

DVC Damodar Valley Corporation

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DRIP Component Wise Project Cost

KaWRD Initial/Revised Projects & Cost

BACKGROUND

In April 2012, the Central Water Commission

(CWC) with assistance from the World Bank,

embarked upon a six year Dam

Rehabilitation and Improvement Project

(DRIP) at a preliminarily estimated initial cost

of Rs.2100 Crore targeting rehabilitation and

improvement of about 250 dams initially of

six, later of nine implementing agencies -

namely: MPWRD, OWRD, TNWRD,

TANGEDCO, KWRD, KSEB, KaWRD,

UJVNL and DVC.

In June 2018, the project was extended by

two years, until June 2020. The current

revised cost for DRIP is Rs.3466 Crore out of which Rs. 2920.5 Crore is allocated for

Component 1 (Rehabilitation and Improvement of Dams and Associated Appurtenances),

Rs.232.5 Crore for Component 2 (Dam Safety Institutional Strengthening), and Rs.313 Crore

for Component 3 (Project Management). Appropriate assistance is also provided under

DRIP to develop O & M Manuals and Emergency Action Plans (EAP) for these dams. The

project also promotes new technologies and improves institutional capacities for dam safety

evaluation and implementation at the Central and State levels as well as in some identified

premier academic and research institutes in the country. The actual total number of dams

under DRIP stands at 223.

The Implementing Agencies for DRIP are the Water Resources Departments and State

Electricity Boards in the participating States and Damodar Valley Corporation (DVC) with

Central Water Commission at Central Level. State Implementing Agencies are responsible

for implementation of works of dams under their charge. Co-ordination and management of

such works within a State rests with the

concerned State Project Management

Unit (SPMU). Overall project oversight

and coordination is carried out by Central

Project Management Unit (CPMU) headed

by the Project Director with assistance of

an Engineering and Management

Consultant.

Karnataka Water Resource Department

(KaWRD) joined DRIP in August 2014

with initial number of dams totalling 31.

Later, KaWRD dropped 9 dams and

continuing in DRIP with 22 dams.

Preliminarily estimated initial DRIP project

cost for KaWRD was Rs.276.1 Crore and

the revised actual current project cost is

Rs.581.2 Crore.


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Table of Contents

Abbreviations ............................................................................................................ i

1. EXECUTIVE SUMMARY .................................................................................. 1

2. PROJECT DETAILS ......................................................................................... 2

2.1 Project Description .......................................................................................................... 2

2.2 Project Location ............................................................................................................... 2

2.3 Project Benefits ................................................................................................................ 3

2.4 Dam and Reservoir Features (Before rehabilitation under DRIP) ............................... 3

2.5 Any Emergency Spillway, Fuse Plug etc. ...................................................................... 4

2.6 Details of previous dam incidents, if any ...................................................................... 4

2.7 PST Details ....................................................................................................................... 5

2.8 DSRP, CPMU and World Bank Recommendations and Compliance ......................... 5

2.9 Scope of Rehabilitation Works as per PST ................................................................... 5

2.10 Drawings ......................................................................................................................... 14

3. DAM VISITS (PST Stage) .............................................................................. 21

3.1 Dam Inspections ............................................................................................................ 21

3.2 Summary of observations made by CPMU ................................................................. 21

4. DESIGN FLOOD REVIEW (DFR) ................................................................... 21

4.1 DFR Outcome ................................................................................................................. 21

4.2 Brief Summary of Review.............................................................................................. 21

4.3 Recommendations ......................................................................................................... 22

5. REHABILITATION WORKS CARRIED OUT ................................................. 22

5.1 Summary of Investigations ........................................................................................... 22

5.2 Main Dam Works ............................................................................................................ 22

5.3 Basic facilities ................................................................................................................ 22

6. INSTRUMENTATION ..................................................................................... 23

6.1 List of existing instruments installed in dam and their condition ............................ 23

6.2 Details of new instruments installed ........................................................................... 23

6.3 CPMU Recommendations ............................................................................................. 23

7. PROCUREMENT OF WORKS ....................................................................... 24

7.1 Package wise details ..................................................................................................... 24

7.2 Details of Bidding process............................................................................................ 25

7.3 Reason for Variation, if any .......................................................................................... 25

7.4 Litigation / Arbitration, If Any ....................................................................................... 25

8. THIRD PARTY CONSTRUCTION SUPERVISION VISITS BY CPMU ........... 25

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8.1. Summary of Visits undertaken .................................................................... 25

8.2. Summary of Third Party Material Testing ................................................... 25

8.3. Summary of Major Recommendations ........................................................ 25

8.4. Summary of Compliance by SPMU ............................................................. 27

8.5. Special Visits made by CWC/World Bank/Expert Committee ................... 27

8.6. Summary of Technical Assistance provided by CPMU ............................. 27

9. ENVIRONMENTAL AND SOCIAL MANAGEMENT FRAMEWORK (ESMF) 28

9.1 Basic Details ................................................................................................................... 28

9.2 Summary of Observations ............................................................................................ 28

9.3 Details of ESMF/EIA study (if any) ............................................................................... 28

10. OTHER NON-STRUCTURAL INTERVENTIONS ........................................... 30

10.1 Basic Details ................................................................................................................... 30

10.2 Summary of Observations ............................................................................................ 30

11. PENDING REHABILITATION WORKS .......................................................... 30

11.1 Details of pending works .............................................................................................. 30

11.2 Further course of action................................................................................................ 30

12. REFERENCES ............................................................................................... 30

Annex A: PST Approval Letter .............................................................................. 31

Annex B: Drawings issued for Rehabilitation measures .................................... 35

Annex C: Completion Certificate .......................................................................... 41

Annex D: Third Party QC Tests ............................................................................. 45

Annex E: ESMF OK Card ....................................................................................... 53

Annex F: Photographs Before and After Rehabilitation Works ......................... 57

Annex G: DBA and Inundation Maps .................................................................... 71

LIST OF FIGURES

Figure 2-1: Index Map of Karanja Dam. ................................................................................................ 14

Figure 2-2: Google Map of Karanja Dam. ............................................................................................. 15

Figure 2-3: Water Catchment Map of Karanja Dam. ............................................................................ 16

Figure 2-4: Layout Map of Karanja Dam. .............................................................................................. 17

Figure 2-5: Longitudinal Section of Karanja Dam. ................................................................................ 18

Figure 2-6: Typical Cross Section of Karanja Earth Dam. .................................................................... 19

Figure 2-7: Spillway Cross-section of Karanja Dam. ............................................................................ 20

Project Rehabilitation Report of Karanja Dam

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1. EXECUTIVE SUMMARY

This Project Rehabilitation Report (PRR) is for Karanja Dam, which is one of the 22

dams under DRIP in Karnataka. The Dam Safety Review Panel (DSRP) inspected

the dam on 8th July 2015 and recommended both structural & non-structural

measures to be taken up by the dam authorities.

DSRP main recommendations included reaming of porous and foundation drains

inside the gallery; provision of horizontal collector drain on dam crest and chute

drains on dam d/s slope; repair of disturbed riprap in selected sections; restoration of

dam crest width in selected sections; removal of anthills on dam d/s slope;

installation of V-notch weir; repair of damaged spillway glacis; replacement of leaking

spillway gate rubber seals; removal of vegetation on spillway structure and repair of

the joints where vegetation had grown; renovation of spillway and sluice gates and

hoisting mechanism including painting, oiling and greasing, provision of trash racks at

entry of sluice vents. Non-structural measures included review of design flood,

preparation of EAP and O&M manual.

In 1989, the dam crest was raised by 2m from 587.15 m to 589.15 m to

accommodate a revised design flood at the time from 8,637 m3/s to 13,281 m3/s. The

latest revised design flood (PMF) under DRIP is 18,761 m3/s with the original design

flood being 13,281 m3/s. Flood routing study carried out by CPMU for the revised

design flood resulted in a MWL of 585.66 m. However, based on the data in the

PST, the MWL is at 587.1 m. Hence, the available free board is 2.05 m (= 589.15 –

587.1), which fulfils the minimum recommended 1.50 m for embankment dams as

per IS 10635.

Following DSRP recommendations, rehabilitation works carried out under DRIP

included:

Reaming of porous holes and foundation drains inside the gallery,

Reconstruction of dry stone rock toe and improvement to V-notch chamber,

Construction of chute and longitudinal drains on dam downstream slope,

Turfing on dam downstream slope,

Providing security barbed wire fencing,

Arresting of leakage on right and left bank sluice gates,

Improvements to Existing Road Adjacent to Bund on Left Side and Right Side

of Downstream

Renovation of spillway and sluice gates as well as hoisting systems including

painting, oiling and greasing,

Construction of manhole covers for toe drain.

The rehabilitation works were executed under 1 contract at a total completion cost of

Rs. 307.21 Lakhs.

The SPMU carried out dam break analysis and prepared inundation maps, which

were reviewed and approved by CPMU.

EAP and O&M manual are currently under preparation by the SPMU as per guideline

published by CWC under DRIP.


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2. PROJECT DETAILS

The Karanja dam is located across Karanja River in Bidar district, Karnataka state at

Latitude of 17º53’00” N and Longitude of 77º19’00” E. It was completed in the year

1988-89. In 1989, the dam crest was raised by 2 m from 587.15 m to 589.15 m to

accommodate a revised design flood at that time.

Karanja dam is masonry cum earth dam, its total length is 3587.5m, which comprise

of an earthen dam 3,480 m long and 4.0 m dam crest width. It has 107.5 m long

spillway with 6 nos. radial gates having discharge capacity of 7078.14 m3/s.

The TBL, FRL, original MWL and Spillway Crest level are at EL 589.15 m, 584.15 m,

587.15 m and 574.15 m, respectively. The gross storage at FRL is 217.78 MCM (or

7.691 TMC).

2.1 Project Description

Sl. No.

Item Details

a. Project Identification Code (PIC) KA06MH0181

b. Project Name Karanja Dam

c. River Basin Godavari

d. Sub River Basin Manjra

e. River/Stream Karanja

f. Catchment area (km2) 2025.28

g. Year of commencement of project 1969-70

h. Year of completion of project 1988-89

2.2 Project Location

Sl. No.

Item Details

a. State Karnataka

b. District Bidar

c. Earthquake Zone II

d. Survey of India Map Ref No’s G-5/G-6

e. Nearest City Bidar

f. Nearest Airport Hyderabad

g. Nearest Railhead Bidar

h. Name of Immediate U/S Project Kottur Barrage

i. Name of Immediate D/S Project Singure Dam

j. Latitude in Deg., Min, Sec. (North) 17º53’00”

k. Longitude in Deg., Min, Sec. (East) 77º19’00”


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2.3 Project Benefits

Sl. No. Item Details

a. Type of Project Irrigation

b. Gross Command Area (Ha) 29227

c. Culturable Command Area (Ha) 29227

d. Annual Irrigation Potential (Ha) 22793

e. Hydropower –

Installed Capacity (MW) Nil

f. Hydropower –

Firm Power (MW) Nil

g. Hydropower –

Average Annual Generation (MU) Nil

h. Domestic/Municipal/Industrial Water –

Annual Quantum (MCM) 29.728 (1.05 TMC)

i. Domestic/Municipal/Industrial Water –

Area and Population Benefitted

Bhalki,Bidar,Humnabad & Chitguppa with enroute villages

j. Flood Protection –

Flood Protected Area (Ha) Nil

k. Flood Protection –

Details of Area Benefitted Nil

l. Details of Tourism/Recreational Facilities Nil

2.4 Dam and Reservoir Features (Before rehabilitation under DRIP)

Sl. No.

Item Details

a. Full Reservoir Level (m) 584.15

b. Original Maximum Water Level (m) 587.15

c. Gross Reservoir Storage Capacity at FRL (Mm

3 )

217.78

d. Live Storage Capacity (Mm3 ) 207.03

e. Revised Live Storage Capacity, if any

(Mm3 )

-

f. Date of bathymetric survey, if any -

g. Dam Type Earthfill Cum Masonry Dam

h.

Length of Dam at Top (m)

i) Total length of the main dam

ii) Length of embankment dam

iii) Length of masonry/concrete dam

3587.5

3480

107.5 (central masonry dam/spillway)

i. Number and length of dykes (No. & m) Nil

j. Top of dam (El. in m.) 589.15

k. Top Level of Upstream Parapet Wall of 590.0


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Sl. No.

Item Details

main dam (El. in m.)

l.

Height of Dam (m)

i) Embankment dam – above river bed level (up to dam top without camber)

ii) Concrete/Masonry dam – above deepest foundation level (up to dam top)

20.70

28.70

m Top width of main dam (m) 4.0 – Embankment dam

7.5 – Masonry dam

n. Spillway details

i) Location Middle (CH 1560 m to CH 1667.5 m)

ii) Type of spillway Ogee

iii) Length of spillway (m) 107.5

iv) Spillway crest level (m) 574.15

v) Type of Gate Radial

vi) Number and size of gates (no. and

m. x m.) 6, 15 x 10

vii) Number and thickness of piers (no.

and m. x m.) 5, 3.4 m thick

o.

Outlet/Sluice details

i) In Embankment dam

Number

Size (Width (m). x Height (m).)

Location

Invert level El. (m)

Discharging capacity (m3/s)

ii) In Concrete/Masonry dam

Number

Size (m. x m.)

Location

Invert level El. (m)

Discharging capacity (m3/s)

2 (LBC, RBC)

1.0 m x 1.0 m, 2.75 m x 2.00

CH 1070 m, CH 2790 m

575.15 m, 575.15 m

1.98, 16.93

Nil

Note: All elevations are above MSL

2.5 Any Emergency Spillway, Fuse Plug etc.

Nil

2.6 Details of previous dam incidents, if any

Nil


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2.7 PST Details

Sl.

No. Item Date/Cost Remarks

a. PST first received from SPMU 02/09/15

b. Proposed PST Cost (INR in Lakhs) 475.0

c. First review by CPMU -

d. Final review by CPMU 29/09/15

e. World Bank Approval 27/10/15 E- mail dated 27/10/2015

f. Approved PST Cost (INR in Lakhs) 450.0

2.8 DSRP, CPMU and World Bank Recommendations and Compliance

2.8.1 DSRP Recommendations and Compliance

Compliance to DSRP recommendations as submitted by SPMU/dam authorities is

shown on pages 15 to 22 below.

2.8.2 CPMU/World Bank Recommendations and Compliance

WB Comments are in line with DSRP comments specially related to repair of

damaged part of the spillway glacis. The SPMU compliance to this comment is as

given in item 29 of the compliance to DSRP comments (see item 29, page 20).

2.9 Scope of Rehabilitation Works as per PST

(a) Remedial Measures (Structural)

i. Reaming the body holes and foundation holes in drainage gallery.

ii. Re-construction of dry stone rock toe,

iii. providing revetment on d/s and u/s

iv. Improvement to V-notch chamber.

v. Providing and fixing rainwater drain and jungle clearance on downstream

vi. Strengthening and arresting of leakages of right bank and left bank sluice gates.

(b) Basic Facilities

vii. Improvement to existing road from main entrance gate to stilling basin.

viii. Improvement to existing road adjacent to bund.

ix. Replacement & augmentation of instrumentation system.

x. Providing CC camera at dam site.

(c) Non-structural Measures

xi. Design flood studies, flood routing study, preparation of EAP, dam break analysis, preparation of inundation maps, preparation of O&M manual; and stability analysis of dam.


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2.10 Drawings

Figure 2-1: Index Map of Karanja Dam.


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Figure 2-2: Google Map of Karanja Dam.


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Figure 2-3: Water Catchment Map of Karanja Dam.


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Figure 2-4: Layout Map of Karanja Dam.


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Figure 2-5: Longitudinal Section of Karanja Dam.


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Figure 2-6: Typical Cross Section of Karanja Earth Dam.

(In 1989, the dam crest was raised by 2 m from 587.15 m to 589.15 m)


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Figure 2-7: Spillway Cross-section of Karanja Dam.


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3. DAM VISITS (PST Stage)

3.1 Dam Inspections

Sl. No.

Item Date of visit Remarks

a. Dam Safety Review Panel (DSRP) 8 July 2015

b. Site Visit made by CPMU experts 8 Oct 2015

3.2 Summary of observations made by CPMU

The following main points are recommended to be considered for development of a

final design and in preparation of the tender documents:

A survey with cross-sections is required to detail areas of the embankment

needing work and can then be used for developing a final design to bring the

embankment to design lines and grades and formation of the proposed rock

toe and toe drain.

Proposed embankment repairs require layout maps and detail drawings

indicating limits and extents of the works to be tendered.

The gallery works should include repair of the original gravity drain to ensure

a dry environment. Porous and foundation drains are to be reamed as

proposed. The porous drains require installation of J-traps in accordance with

IS codes. These traps will minimize entry of air, which causes formation of

calcination and calcareous deposits.

CPMU recommends a full disclosure on all environmental impacts along with

the Contractor’s mitigation measures. All mitigation measures are

recommended to be included in the tender documents to ensure mitigation

measures are implemented.

4. DESIGN FLOOD REVIEW (DFR)

4.1 DFR Outcome

Sl. No.

Item Original

Value

Revised

Value Remarks

a. Inflow Design Flood (m3/s) 13,281 18,761 PMF

b. Spillway Capacity / Routed Outflow (m

3/s)

7,078.14 7,571.66 Flood routing

study by CPMU

c. Maximum Water Level (m) 587.1 585.66 TBL = 589.15

4.2 Brief Summary of Review

In 1989, the dam crest was raised by 2 m from 587.15 m to 589.15 m to accommodate a revised design flood at the time from 8,637 m3

/s to 13,281 m3/s. The

latest revised design flood (PMF) under DRIP is 18,761 m3/s with the original design

flood being 13,281 m3/s. Flood routing study carried out by CPMU for the revised

design flood resulted in a MWL of 585.66 m. However, based on the data in the PST, the MWL is at 587.1 m. Hence, the available free board is 2.05 m (= 589.15 – 587.1), which fulfils the minimum recommended 1.50 m for embankment dams as per IS 10635.


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4.3 Recommendations

Structural measures - Nil.

Non-structural measures - EAP & O&M.

5. REHABILITATION WORKS CARRIED OUT

5.1 Summary of Investigations

Sl. No.

Item Details Remarks

a. Geo-Physical Investigations

NA b. Geo-Technical Investigations

c. Hydraulic Model Studies

d. Under-Water Scanning

5.2 Main Dam Works

Sl. No.

Item Details Remarks

a. Works from hydrological angle Design flood review Design flood Completed.

b. Resetting of disturbed upstream pitching (rip-rap)

Upstream side revetment correction and construction of

template wall Completed

c. Repairs to d/s toe drains, provision of V-Notches for seepage measurements

Construction of lead off drain at dam top and chute drains

on dam d/s slope Completed

d. Repairs / provision of d/s rock toe Provision of d/s rock toe Completed

e. Provision for d/s turfing Turfing on d/s dam slope Completed

f. Re-drilling / Reaming of drainage holes in the dam body and in the foundations

Reaming of porous and

foundation drains inside

gallery

Completed

g. Works because of Seepage / leakage issues

Arresting leakage in RBC and

LBC Completed

h. Hydro-mechanical works Re-construction of dry

stone rock toe Completed

i. Main spillway gates & hoists Repair of spillway gates,

rubber seal, walkway Completed

ii. Outlet gates & hoists Repair of RBC and LBC sluice

gates Completed

i. Other miscellaneous works d/s of embankment dam

Casting of concrete manhole covers;

Completed

5.3 Basic facilities

S/N Item Details Status

a. b. Roads Construction of approach road Completed

b. c. Others Improvements to V-notch Completed


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6. INSTRUMENTATION

6.1 List of existing instruments installed in dam and their condition

V-notch weir.

6.2 Details of new instruments installed

Nil.

6.3 CPMU Recommendations

Nil.


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7. PROCUREMENT OF WORKS

7.1 Package wise details

Work Package No.

Name of Works

Estimated

Cost

(INR in Lakhs)

Procurement

Method

Invitation for bids / NIT Issue

date

Pre-Bid Meeting

date

Bid Opening

date

Contract Agreement

No.

Contract Agreement

date

Contractor’s Name &

Address

Scheduled

Duration (Months)

Scheduled Completio

n date

Contract /

Award Value

(INR in Lakhs)

Completion Cost (INR in Lakhs)

Actual Date of

Completion

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

1

Dam Rehabilitation and Improvement Works to Karanja Dam Under World Bank aided DRIP

program

302.8 NCB 05/03/16 06/04/16 19/12/15 No. 989/

2016-17 DT: 14/12/2016

Sri G.D.Lamani,

Class-I Contractor R/o E/33

Ramnagar Tande, E-Gudisalar, Shorapur,

Dist: Yadgir

12 13/12/17 323.97 307.21 21/11/18


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7.2 Details of Bidding process

As per details in the above table.

7.3 Reason for Variation, if any

SPMU reported Rs. 70.19 lakhs savings due to change in scope of work during

construction.

7.4 Litigation / Arbitration, If Any

No litigation.

8. THIRD PARTY CONSTRUCTION SUPERVISION VISITS BY

CPMU

8.1. Summary of Visits undertaken

Sl. No. Date of visit Transmittal details of CSV Report

a. 11-07-2017 4900 / 16-08-2017

b. 10-10-2017 530 / 29.11.2017

c. 26-03-2018 5612 / 17-05-18

d. 25-07-2018 6210 / 10.08.2018

8.2. Summary of Third Party Material Testing

Third party quality control tests were performed on aggregates as well as on M15

concrete for man-hole cover and dam d/s slope chute and longitudinal drains using

non-destructive Schmidt hammer test (NDT). The tests gave satisfactory results.

Detailed test report is attached as Annexure D.

8.3. Summary of Major Recommendations

1st Construction Site Visit Report

Observations & Recommendations:

Rain cuts have disturbed the downstream slope of the embankment; the slope

must be rectified by earth fill and compaction to the designed slope before turfing

of the downstream slope.

Rock toe which had disturbed at Right Flank has been rectified by resetting. But

observed settlement at part of the area and suggested to remove and reset the

same to the proper level.

Noted construction compliance issues:

No Observation / Deficiency Remarks

1 Chute drains constructed are not to required line and level, finishing is not good

Project authorities have to take action to rectify the defect and also use good form work for smooth surface. Proper checking of formwork for line and grade is essential.

2 Rain water cuts have disturbed Slope to be rectified to designed slope and section


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the slope and some locations there appears to be bulging due to deposition of eroded earth from rain water at lower elevation.

before turfing as an additional work.

3 Rock toe rectified has depression in part of the area

To be rectified and proper supervision is needed while carrying out the work.

4 Disturbance at many locations in d/s rock toe

To be rectified as additional work.

5 Vegetation gown on the pier To be cleared as and when appears to avoid widening of gaps at lift joints or crevices.

2nd Construction Site Visit Report





2

Rain water cuts have disturbed the slope and some locations there appears to be bulging due to deposition of eroded earth from rain water at lower elevation.

Slope to be rectified to designed slope and section before turfing as an additional work.





5 Vegetation gown on the pier Vegetation cleared. Closed.

6

Lot of vegetation has grown at

D/s slope of earthen dam and at

top of earth dam by the side of

asphalted road.

To be uprooted to avoid loosening of the earthen

embankment

7

Damages occurred to D/s slope

and top of earthen embankment

approximately between

Ch.2900.00 m and 3000.00.

Embankment top and D/s slope must be restored,

and kerb stones or drain must be provided at D/s o

crest to divert the surface water to chute drains.

8 Mortar layers of spillway glacis

has eroded here and there.

Application of abrasive resistant coat will help in

avoiding further deterioration of surface

3rd and 4th Construction Site Visit Report Observations:





2 Rain water cuts have disturbed the slope and some locations

Slope to be rectified to designed slope and section before turfing as an additional work.


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there appears to be bulging due to deposition of eroded earth from rain water at lower elevation.





5 Vegetation gown on the pier Vegetation cleared. Closed.

6

Lot of vegetation has grown at

D/s slope of earthen dam and at

top of earth dam by the side of

asphalted road.

To be uprooted to avoid loosening of the earthen

embankment

7

Damages occurred to D/s slope

and top of earthen embankment

approximately between

Ch.2900.00 m and 3000.00.

Embankment top and D/s slope must be restored,

and kerb stones or drain must be provided at D/s o

crest to divert the surface water to chute drains.

8 Mortar layers of spillway glacis

has eroded here and there.

Application of abrasive resistant coat will help in

avoiding further deterioration of surface

9

Erosion of dam d/s slope due to

high pressure from hose pipes

for slope protection grass

irrigation

Shower nozzles to be mounted to the hose pipes.

Also, reduce hose pipe diameter if necessary.

10

Significant delay by contractor

for unknown reasons. Contract

expired on 15/12/17 but EoT not

yet requested.

Contractor to take immediate necessary actions to

speed up and complete works.

11

No lighting in gallery and no

proper drainage gallery

seepage

Lighting work completed. Closed.

8.4. Summary of Compliance by SPMU

Compliance letter received from SPMU against the CPMU experts’ comments during

construction site visits is shown below on page 38.

8.5. Special Visits made by CWC/World Bank/Expert Committee

Nil

8.6. Summary of Technical Assistance provided by CPMU

Review of PST. Review of design flood and flood routing.

Provided technical guidance on maintaining quality of works as per design, contract agreement technical specification and best engineering practices.

Third party quality control tests.

Review of dam break analysis and inundation maps.

Review of O&M manual (currently on-going).

Review of EAP (currently on-going).


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9. ENVIRONMENTAL AND SOCIAL MANAGEMENT

FRAMEWORK (ESMF)

9.1 Basic Details

Sl. No.

Item Yes / No Remarks

a. ESMF Issue Identified in PST Yes

b. Mitigation Measures Proposed Yes

c. Any Rehabilitation and Resettlement involved No

d. Site Visit Date of CPMU E&S Specialists -

e. Site Visit Report of CPMU E&S Specialists -

9.2 Summary of Observations

ESMF management during implementation was generally satisfactory but PPE was

hardly used during construction. ESMF OK Card is attached in Annexure E.

9.3 Details of ESMF/EIA study (if any)

Nil.


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SPMU Compliance to CPMU Comments during CSV


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10. OTHER NON-STRUCTURAL INTERVENTIONS

10.1 Basic Details

Sl. No.

Item Yes / No Remarks

a

Emergency Action Plan (EAP)

(i) EAP Available at Site

(ii) EAP Prepared under DRIP

(iii) EAP Published

(iv) Stake holder consultations

No

Yes

No

No

Draft inundation maps prepared by SPMU was reviewed by CPMU on 24/07/2018, final version submitted on 11/04/2019 & approved by CPMU on 12/04/2019. EAP currently under preparation.

b. O&M Manual availability Yes It is to be revised as per guidelines issued by Central Water Commission (CWC) in January 2018

c. Inflow Forecasting No

d. DHARMA Implementation Yes In progress. So far 67% data uploaded.

e. Siren No Needs to be installed

10.2 Summary of Observations

Nil

11. PENDING REHABILITATION WORKS

11.1 Details of pending works

i. Preparation of EAP.

ii. Preparation of O&M Manual as per guideline published by DRIP.

iii. Completion of data entry in DHARMA.

11.2 Further course of action

All pending actions stated above should be completed before December 2019.

12. REFERENCES

i. PST

ii. DSRP report

iii. Construction site visit report.

iv. Information received from SPMU from time to time

v. Completion Certificate.

vi. World Bank approval

vii. Third party testing.

viii. Compliance letters from SPMU.

ix. ESMF OK Card

x. DBA and Inundation Maps


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Annex A: PST Approval Letter


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Annex B: Drawings issued for

Rehabilitation measures


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Annex C: Completion Certificate


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Annex D: Third Party QC Tests


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Annex E: ESMF OK Card


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Annex F: Photographs Before and

After Rehabilitation Works


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Spillway Gates - Before

Spillway Gates - After


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Spillway Gates – During Painting

Spillway Gates – During Replacement of Rubber Seal


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Stoplog Gates – Before


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Stoplog Gates – After


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Dam downstream slope – Before

Dam downstream slope – During Rehabilitation


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Dam downstream slope – During Turfing

Dam downstream slope – After


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Access Road – Before

Access Road – During Rehabilitation


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Access Road – After


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Reaming of porous and foundation drains inside gallery


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Lighting arrangement inside gallery


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Shed for sluice gate hoisting system

Renovation and painting of sluice gate


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Manhole – Before Cleaning

Manhole – After Cleaning

Renovated Gantry Crane

Fencing


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Annex G: DBA and Inundation Maps


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project rehabilitation report of karanja dam,

Documents