DAM SAFETY AND DRIP ACTIVTIES IN TAMIL NADU Presented by V.D.SURESH PROJECT DIRECTOR, TNSPMU 1
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) 2
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 3
AGE-WISE DISTRIBUTION OF WRD DAMS S.No AGE No. of DAMS 1 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 4
30 Dams 2 Dams 2 Dams 10 Dams Above 100 YEARS 41 Dams 75 YEARS - 100 YEARS 50 YEARS - 75 YEARS 25 YEARS - 50 YEARS LESS THAN 25 YEARS 5
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 Deputy Superintending Engineer Assistant Executive Engineer Assistant Engineer Office Staff Total - 1 No. - 1 No. - 2 Nos. - 5 Nos. - 8 Nos. - 17 Nos. 6
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) 7
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. 8
Monsoon Reports 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 9
Health Status Report Periodical monsoon inspections of Dams are carried out yearly four times by the field officers as per the target given below. Sl. No. Monsoon Period of InspectionTarget Date for Submission 1) Pre-Monsoon 10 th Apr - 14 th Jun 25 th June 2) Monsoon I 15 th Jun - 15th Aug 3) Monsoon II 16 th Aug - 14 th Nov 4) Post Monsoon 15 th Nov - 9 th Apr 25 th August 25 th November 20 th April Pre and Post Monsoon Reports are reviewed by Dam Safety Directorate and the Health status of the Dam is assessed. Annual Consolidation Report (ACR) is prepared every year by consolidating Health Status Report for all the Dams based on Pre Monsoon and Post Monsoon inspection reports and submitted to CWC for review. 10
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. 5 th cycle inspection commenced from September 13. So far 11 dams have been inspected. 11
PHASE II INSPECTION A Dam Safety Expert Committee (National Expert Team) for carrying out phase II safety inspection of dams is constituted by Govt. Members of Phase II committee are 1. Dr. B.K.Mittal, Former Chairman, CWC 2. Shri K.V.Subba Rao, Former CE, Hyderabad 3. Shri O.D. Mande, New Delhi Phase II inspection should be conducted when the findings of the phase I inspection indicates the need for additional analysis and investigation to any Dam. 12
State Dam Safety Committee The State Dam Safety Committee meets once in six months with the following members to discuss the Dam safety issues. The Secretary to Government Chairman Public Works Department The Secretary to Government Vice-Chairman Energy Department The Engineer-in-Chief, PWD, Member WRD,Chennai-5. The Chief Engineer, PWD, WRD, Member Operation and Maintenance, Chennai-5. The Chief Engineer, PWD,WRD Member DRCS, Chennai-5. 13
The Chief Engineer, PWD, WRD, Chennai Region, Chennai-5 Member The Chief Engineer, PWD, WRD, Member Trichy Region, Trichy-20. The Chief Engineer, PWD, WRD, Member Coimbatore Region, Coimbatore-1. The Chief Engineer, PWD, WRD, Member Madurai Region, Madurai-2. The Chief Engineer, (Civil Design), Member Tamil Nadu Generation and Distribution Corporation Limited, Anna Salai, Chennai-2. 14
The Director, Member Geological Survey of India Or Representative from GSI, Chennai-90 The Deputy Director(General) Member Regional Meteorological Dept, Chennai Or his representative, Chennai-6. The Director, Structural Engineering Research Centre, CSIR Campus, Chennai-113 Member The Director, Member Secretary Dam Safety Directorate 15
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 held at New Delhi on 23.09.2014. was 16
Other Activities 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 17
AWARD FOR BEST MAINTAINED DAM Government have constituted a Committee for Selection of Best Maintenance of Dams in the G.O.(Ms) No.18 Public Works(I.Spl.1) Department Dated: 25.01.2012. The Hon ble Chief Minister ordered that a cash incentive of Rs.10,000/- awarded from the level of Assistant Engineer to the level of Executive Engineer, Certificate and Shield for Superintending Engineers and Chief Engineers for the Best Dam Maintenance in that year. (as per G.O. Ms.No: 20 PW (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 DAM Awarded 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) Thunacadavu Dam Awarded on12.02.2014 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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DAM REHABILITATION AND IMPROVEMENT PROJECT 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 : 24.08.2012 26
DRIP Overall project cost of the country - Rs.2100.00 Crore or US $437.50 Million Project cost for Tamil Nadu - Rs.745.49 Crore or US $155.31 Million Funding Pattern - 80% World Bank share & 20% State Govt share Departments involved in TN - WRD, TANGEDCO & AED Flow of funds World Bank GoI GoTN WRD TANGEDCO AED 27
Sl. No Name of the State Implementing organization No. of dams Amount in Rs.Crore 1 Kerala WRD & KSEB 31 279.98 2 Madhya Pradesh WRD 50 314.54 3 Odisha WRD 38 147.74 4 Tamil Nadu WRD, TANGEDCO and AED 104 745.49 5 CWC CWC - 132.00 6 Unallocated Resources PARTICIPATING STATES - 480.25 Total 223 2100.00 28
Component wise breakup cost for Tamil Nadu Sl. No. (Rs. in crore) Description WRD TANGEDCO AED Total 1 Rehabilitation & Improvement 420.615 259.349 15.407 695.371 2 Institutional Strengthening 3 Project Management 25.572 0.348-25.920 16.650 - - 16.650 4 Recurring Cost 7.549 - - 7.549 Total 470.356 259.697 15.407 745.490 Conversion rate: 1 US $ = Rs.48/- Funding Pattern World Bank and States 80:20
ACTIVITIES UNDER DRIP 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 30
DRIP IMPLEMENTATION PROCEDURE HYDROLOGICAL REVIEW STUDY & FLOOD ROUTING Design Circle, WRD DAM SAFETY REVIEW PANEL INSPECTION To be vetted by Large Dams CPMU/CWC Small & Intermediate Dams Design Circle, WRD Additional surplus arrangements Design (if required) stability analysis, filter design etc. Panel I (Three members) Panel II (Three members) DETAILED ESTIMATE -Field Engineers Procurement Plan to be sent to WB for approval PROJECT SCREENING TEMPLATE 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
Classification of dams as per IS11223-1985 Sl. No. Classification of Dam Gross Storage (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 2 Intermediate 10-60 12-30 100 year Storm Standard Project Storm 19 2 41 17 3 Large >60 >30 Probable Maximum Storm 15 19 Total 75 38 32
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. 33
PROGRESS OF DRIP IN TAMILNADU 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% 34
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. 35
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. 3 rd 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. 36
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. 37
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