DAM SAFETY ANDDRIP ACTIVTIES IN

TAMIL NADU

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Presented by

V.D.SURESHPROJECT DIRECTOR, TNSPMU

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TAMIL NADU PROFILE

Area : 1,30,058 sq.km (4% of the Country Area – 32,87,590 sq km)

Population : 7.21 crore(2011 census - 6 % of India’s population – 121.02 Crore)

Annual Average Rainfall : 930 mm (47% - NE & 37% SW 16% - Non monsoon)

River Basins : 17 (1-Major, 13-Medium & 3-Minor)

Total Water Potential : 47679 MCM (1683.82 TMC)a) Surface : 27030 MCM (954.58 TMC)b) Ground Water : 20649 MCM (729.23 TMC)

Storage structures in Tamil Nadu

WRD Dams - 85 Nos.

Storage Capacity of Dams – 6500 MCM

Tanks - 39000 Nos. (approx.)

Storage Capacity of Tanks - 6000 MCM

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AGE-WISE DISTRIBUTION OF WRD DAMS

S.No AGE No. of DAMS1 Above 100 YEARS 2

2 75 YEARS - 100 YEARS 2

3 50 YEARS - 75 YEARS 10

4 25 YEARS - 50 YEARS 41

5 LESS THAN 25 YEARS 30

TOTAL 85

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2 Dams 2 Dams10 Dams

41 Dams

30 Dams

Above 100 YEARS

75 YEARS - 100 YEARS

50 YEARS - 75 YEARS

25 YEARS - 50 YEARS

LESS THAN 25 YEARS

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DAM SAFETY DIRECTORATE

• To give assurance to the safety of dams in Tamil Nadu,

The Dam Safety Directorate (DSD) established in the year 1991

(vide G.O Ms. No: 2771 PWD dt-28-12-90)

• Functioning with the following staff :-

Superintending Engineer - 1 No.

Deputy Superintending Engineer - 1 No.

Assistant Executive Engineer - 2 Nos.

Assistant Engineer - 5 Nos.

Office Staff - 8 Nos.

Total - 17 Nos.

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ACTIVITIES OF DAM SAFETY DIRECTORATE

• Preparation of Health Status Report of dams (WRD &

TANGEDCO)

• Annual Consolidated Report (ACR)

• Technical Investigation of large dams by Multi-Disciplinary Committee. (Phase-I Investigation of Dams)

• Phase – II Inspection Committee

• State Dam Safety Committee (SDSC)

• National Committee on Dam Safety (NCDS)

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Definition of Large Dams for inclusion under NRLD

• A large dam - Maximum height of more than 15 meters from its deepest foundation to the crest

A dam between 10 m and 15 meters in height from deepest foundation is also classified as Large Dam if it satisfies with any one of the following conditions:

a) Length of crest of the dam not less than 500 meters or

b) capacity of the reservoir not less than one MCM or

c) Max. discharge of the dam not less than 2000 cubic metre or

d) Dam specially with difficult foundation problems or

e) Dam of unusual design.

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Monsoon reports for all the dams are being

prepared every year after inspecting the dams by the

concerned inspecting officers at various levels as

detailed below:

Height of Dam Inspecting officer

<30m Executive Engineer

30m to 60m Superintending Engineer

>60m Chief Engineer

Monsoon Reports

Periodical monsoon inspections of Dams are carried out yearly four times by the field officers as per the target given below.

Health Status Report

Annual Consolidation Report (ACR) is prepared everyyear by consolidating Health Status Report for all theDams based on Pre Monsoon and Post Monsoon inspectionreports and submitted to CWC for review. 10

Pre and Post Monsoon Reports are reviewed by DamSafety Directorate and the Health status of the Dam isassessed.

Sl. No.

Monsoon Period of InspectionTarget Date for Submission

1) Pre-Monsoon 10th Apr - 14th Jun 25th June

2) Monsoon I  15th Jun - 15th Aug

3) Monsoon II 16th Aug - 14th Nov

4) Post Monsoon 15th Nov - 9th Apr

25th  August

25th November

20th April

Technical Investigation of large dams (Phase-I Inspection)

WRD and TANGEDCO dams are inspected once in five years by a five

member multidisciplinary committee

1) Director - Dam Safety Directorate - Chairman

2) Superintending Engineer (Designs), WRD - Member

3) Executive Engineer (Soil Mechanics

and Research Division), WRD - Member

4) General Superintendent,

P.W.Workshop and Stores, WRD - Member

5) A Representative from

Geological Survey of India, Chennai. - Member

• So far 4 cycles have been completed.• 5th cycle inspection commenced from September’13. • So far 11 dams have been inspected.

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PHASE II INSPECTION A Dam Safety Expert Committee (National

Expert Team) for carrying out phase – II safetyinspection of dams is constituted by Govt.

Members of Phase II committee are1. Dr. B.K.Mittal, Former Chairman, CWC2. Shri K.V.Subba Rao, Former CE, Hyderabad3. Shri O.D. Mande, New Delhi

Phase II inspection should be conducted whenthe findings of the phase I inspection indicatesthe need for additional analysis andinvestigation to any Dam.

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State Dam Safety CommitteeThe State Dam Safety Committee meets once in sixmonths with the following members to discuss the Damsafety issues.

The Secretary to Government ChairmanPublic Works Department

The Secretary to Government Vice-ChairmanEnergy Department

The Engineer-in-Chief, PWD, MemberWRD,Chennai-5.

The Chief Engineer, PWD, WRD, MemberOperation and Maintenance, Chennai-5.

The Chief Engineer, PWD,WRD MemberDRCS, Chennai-5.

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The Chief Engineer, PWD, WRD, MemberChennai Region, Chennai-5

The Chief Engineer, PWD, WRD, MemberTrichy Region, Trichy-20.

The Chief Engineer, PWD, WRD, MemberCoimbatore Region, Coimbatore-1.

The Chief Engineer, PWD, WRD, MemberMadurai Region, Madurai-2.

The Chief Engineer, (Civil Design), MemberTamil Nadu Generation and DistributionCorporation Limited,Anna Salai, Chennai-2.

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The Director, MemberGeological Survey of IndiaOr Representative from GSI , Chennai-90

The Deputy Director(General) MemberRegional Meteorological Dept, ChennaiOr his representative, Chennai-6.

The Director, MemberStructural Engineering Research Centre, CSIR Campus, Chennai-113

The Director, Member SecretaryDam Safety Directorate

National Committee on Dam Safety

The National Committee on Dam safety meets once in a year with

the following members.

Chairman - Chairman,

Central Water Commission

Member Secretary - Chief Engineer (DSRO), CWC

Members - All State Chief Engineers

In Charge of Dam Safety

So far 34 meetings were conducted and the last meeting was

held at New Delhi on 23.09.2014.

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Other Activities

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Preparation of Geological Mapping documents of Dams through GSI, India.

Preparation of History Books of dams

Preparation of Dam Safety Bill 2010

Awards to Best Maintained Dams

All issues related to Dam Safety aspects

AWARD FOR “BEST MAINTAINED DAM”

• Government have constituted a Committee forSelection of Best Maintenance of Dams in theG.O.(Ms) No.18 Public Works(I.Spl.1) DepartmentDated: 25.01.2012 .

• The Hon’ble Chief Minister ordered that a cashincentive of Rs.10,000/- awarded from the level ofAssistant Engineer to the level of ExecutiveEngineer, Certificate and Shield for SuperintendingEngineers and Chief Engineers for the Best DamMaintenance in that year. (as per G.O. Ms.No: 20PW (I Spl 1) Dept dated 06.03.2013)

DAMS AWARDED AS“BEST MAINTAINED DAM”

• 2011 – 2012    ‐ VAIGAI DAM Awarded on 27.01.2012

DAMS AWARDED AS“BEST MAINTAINED DAM”

• 2012 – 2013    ‐ MULLAI PERIAR DAMAwarded on 06.05.2013

DAMS AWARDED AS“BEST MAINTAINED DAM”

• 2013 – 2014    ‐ PARAMBIKULAM  DAM Group (Parambikulam , Peruvaripallam, Thunakkadavu Dam)

Awarded on12.02.2014

Parambikulam Dam

• 2013 – 2014    ‐ PARAMBIKULAM  DAM Group (Parambikulam , Peruvaripallam, Thunakkadavu Dam)

Awarded on12.02.2014Thunacadavu Dam

Peruvaripallam Dam

Best Maintained Dam Awarded by the Hon’ble Chief Minister

to the Executive Engineer(Mullai Periyar Dam)

Best Maintained Dam Awarded by the Hon’ble Chief Minister

to the Assistant Engineer(Mullai Periyar Dam)

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Objective: To improve the safety and operational

performance of the dams.

Project Period : 6 Years (2012-13 to 2017-18)

Agreement signed : 21.12.2011

Effectiveness of DRIP : 18.04.2012

Formation of SPMU : 24.08.201226

DAM REHABILITATION AND

IMPROVEMENT PROJECT

Overall project cost of the country - Rs.2100.00 Crore orUS $437.50 Million

Project cost for Tamil Nadu - Rs.745.49 Crore orUS $155.31 Million

Funding Pattern - 80% World Bank share & 20% State Govt share

Departments involved in TN - WRD, TANGEDCO & AED

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DRIP

Flow of fundsWorld Bank GoI GoTN

WRD

TANGEDCO

AED

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Sl.No

Name of the State

Implementingorganization

No. of dams

Amount in

Rs.Crore1 Kerala WRD & KSEB 31 279.982 Madhya Pradesh WRD 50 314.54

3 Odisha WRD 38 147.744 Tamil Nadu WRD,

TANGEDCOand AED

104 745.49

5 CWC CWC - 132.006 Unallocated

Resources- 480.25

Total 223 2100.00

PARTICIPATING STATES

(Rs. in crore)

Sl.No.

Description WRD TANGEDCO AED Total

1 Rehabilitation & Improvement

420.615 259.349 15.407 695.371

2 Institutional Strengthening

25.572 0.348 - 25.920

3 Project Management

16.650 - - 16.650

4 Recurring Cost 7.549 - - 7.549

Total 470.356 259.697 15.407 745.490

Component wise breakup cost for Tamil Nadu

Conversion rate: 1 US $ = Rs.48/-Funding Pattern – World Bank and States – 80:20

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Rehabilitation and Improvement to 113 Dams

(75 WRD & 38 TANGEDCO)

Catchment Area Treatment works in two Reservoirs

(Kundah & Krishnagiri) by AED.

Conducting Sedimentation Studies in 60 Dams

ACTIVITIES UNDER DRIP

HYDROLOGICAL REVIEWSTUDY

&FLOOD ROUTING – Design

Circle, WRD

Large Dams – CPMU/CWC

Small & Intermediate Dams – Design Circle, WRD

Additional surplus arrangements Design (if required) stability analysis, filter design etc.

DAM SAFETY REVIEW PANEL INSPECTION

DETAILED ESTIMATE -Field Engineers

PROJECT SCREENING TEMPLATE

To be vetted by

Panel I (Three members)

Panel II (Three members)

First level screening-

SPMU

Second level screening-

CPMU

Approval by World Bank

ADMINISTRATIVE / TECHNICAL SANCTION

TENDER PROCESS ( Bid document approval - Inviting tenders

- Tender award Committee approval -Bid Evaluation Report approval )

Prior Review Works (Rs.5-25 crore ) - CPMU Approval to be obtained for Bid Documents

Post Review Works (<Rs. 5crore - CPMU Approval to be obtained after concluding agreement

AWARD  OF CONTRACT 

Procurement Plan‐ to be sent to WB for approval

DRIP IMPLEMENTATION PROCEDURE

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Classification of dams as per IS11223-1985

Sl.No.

Classificationof Dam

GrossStorage(Mcm)

Hydraulic Head(m)

Inflow Design Storm

Total No. of WRD dams

Total No. of TANGEDCO

dams

1 Small 0.5-10 7.5 -12 100 yearStorm 19 2

2 Intermediate 10-60 12 -30StandardProjectStorm

41 17

3 Large >60 >30ProbableMaximumStorm

15 19

Total 75 38

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Rehabilitation works in Dams under DRIP:

Strengthening of Earthen bund

Repairs to Revetment/ rip -rap in u/s face , Chutes, Parapet walls/kerb walls, Toe drain, Rock Toe, Road on top of dam, d/s rubble apron, Energy dissipation arrangement, Filter Arrangements etc.

Reaming the Vertical Drainage Shaft

Grouting if necessary

Providing additional Surplus Weir / Fuse plug Arrangements if required

Repairs/ replacement of shutters

Repairs or providing Instrumentation

Improving Basic facilities – Electrification, Communication Facilities, Lightning Conductors

Automatic weather stations, Digital water level indicators, Flood warning System (Siren) are proposed to be installed.

PROGRESS OF DRIP IN TAMILNADU

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IA Hydrology Flood Routing DSRP Template AS

Obtained

Tender to be called

Tender under

process

Work in Progress

WRD (75) 67 62 69 26 22 2 3 9

89% 83% 92% 35% 29% 3% 4% 12%

TANGEDCO (38)

31 10 29 4 6 2 - 3

82% 26% 76% 11% 16% 5% - 8%

Total ( 113)

98 72 98 30 28 4 3 12

87% 64% 87% 27% 25% 4% 3% 11%

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MONITORING AND EVALUATION

A. TECHNICAL COMMITTEE (TC) MEETING FOR DRIP

Technical Committee for DRIP was constituted:

To provide technical input to the National

Level Steering Committee for DRIP.

To finalize technical details of the project.

To co-ordinate with the implementing

committees of respective State Governments.

To review the progress of the projects and

To report to the National Level Steering

Committee.

Once in three months to review the progress.

So far 10 TC meetings have been conducted.

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B. REVIEW BY WORLD BANK MISSION

Review twice in a year.

If required Mid term review will be conducted to

discuss the bottle necks.

So far 4 WB meetings have been conducted.

3rd World Bank Review Mission Meeting was

organised by TNSPMU @ Kodaikanal on 28.10.13.

WB Mid-term review Mission meeting was

organised by TNSPMU @ Ooty on 14.10.14.

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CONCLUSION

The expected out come of the project are:

• The dam and its appurtenances are standardized

to its original design strength.

• Existing deficiencies are rectified and safety is

improved.

• Life of the dam is extended.

• Operational performance is increased and serve

to the state by bringing maximum benefits.

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