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Dam Safety Directorate

The Dam Safety Directorate (DSD) was established in the year 1991 in Tamil Nadu with the object of giving assurance to safety of large dams in Tamil Nadu vide G.O Ms. No: 2771 PWD dt-28 -12-90. At present, there are 89 nos of WRD dams, (including 3 nos of small dams and 4 nos of drinking water supply reservoirs) and 38 nos of TANGEDCO large dams. The Dam Safety Directorate is headed by a Director in the rank of a Superintending Engineer with the sanctioned strength of 21 Nos.
The following are some of the important tasks carried out by the Dam Safety Directorate:-
Preparation of Health Status Report for Dams based on Monsoon inspection reports:

The periodical monsoon inspections of Dams are carried out yearly four times by the field officers (from the level of Executive Engineers to Chief Engineers) as per the guidelines given in G.O.Ms.No. 262 PWD Dated 18-2-1991 and Government letter no.79025 / PWD X2 / 93-3 Dated 10-9-1993 and the reports are prepared by them in the proforma prescribed by the CWC and sent to the Dam Safety Directorate as detailed below.

Sl. No Period Target date for inspection Target Date for Reporting
1. Pre Monsoon 10th Apr – 14th Jun Before 25th June
2. Monsoon I 15th Jun – 15th Aug Before 25th August
3. Monsoon II 16th Aug – 14th Nov Before 25th November
4. Post Monsoon 15th November-9th April of succeeding year. Before 20th April

The monsoon reports received from the field are reviewed by the DSD and Health Status Reports (HSR) are prepared for each monsoon period prioritizing the deficiencies and submitted to the Secretary to the Government PWD, Chief Engineer, O&M, Regional Chief Engineers of WRD and Chief Engineer (TANGEDCO).
The Regional Chief Engineers of WRO and Chief Engineer, TANGEDCO are requested to take follow up action for rectifying the deficiencies.
Annual Consolidated Report
The consolidated Health Status Report for all the Dams (Annual Consolidated Report) based on the pre-monsoon and post monsoon inspections are prepared and submitted to the Central Water Commission for review.
Preparation of History Books of dams:
So far, History books for 9 dams have been prepared. viz. 1. Vaniar, 2. Gomukhi, 3. Mettur, 4. Uppar ( Erode ), 5. Periyar, 6. Pechiparai, 7. Manjalar 8. Manimuthar and 9. Sholaiyar. Preparation of History books for the remaining dams is under progress.
Preparation of Geological Mapping documents of Dams:
The Geological Mapping documents of dams are being prepared through Geological Survey of India (GSI). So far, Geological mapping documents were prepared for 65 PWD dams and 36 TNEB dams.
For the preparation of Geological Mapping Document for the remaining dams, as insisted by the GSI, MoU has to be signed with them by the SE, DSD and advance payment has to be made for rendering technical services including preparation of Geological Mapping Documents. Necessary concurrence of Superintending Engineer, Dam Safety Directorte for signing of MoU has been sent to GSI and reply from GSI is awaited.
Since necessary provisions are available in DRIP, preparation of Geological mapping documents under DRIP for the remaining dams is under progress.
State Dam Safety Committee (SDSC)
The State Dam Safety Committee was constituted in G.O. Ms. No. 261 PWD Dated 18-2-1991. The Committee was reconstituted to monitor the safety aspects of all the Dams of Tamil Nadu State in G.O. Ms. No. 375 PW (WR2) Dept Dated 30-6-1997 with the following members.
1) Secretary to Government – PWD Chairman
2) Secretary to Government – Energy Department Vice Chairman
3) Engineer-in Chief, WRD Member
4) Chief Engineer – Operation & Maintenance – WRD Member
5) Chief Engineer – Madurai Region – WRD Member
6) Chief Engineer – Trichy Region – WRD Member
7) Chief Engineer – Coimbatore Region – WRD Member
8) Chief Engineer – Chennai Region – WRD Member
9) Chief Engineer – D.R.& C.S – WRD Member
10) Chief Engineer – TNEB – Civil Designs Member
11) Director – Geological Survey of India Member
12) Deputy Director General – Regional Meteorological Department Member
13) Director – SERC or Representative Member
14) Director – Dam Safety Directorate – WRD Member Secretary

National Committee on Dam safety (NCDS)
The Chief Engineer, O & M is the member of the National Committee on Dam safety under the Chairmanship of the Chairman, Central Water Commission which reviews the activities of the State Dam Safety Organisations in the States. The National Committee on Dam safety meets twice in a year.
Award for Best Maintained Dam
Hon'ble Chief Minister, in order to give a fillip for maintaining the dams in good condition, has instituted an award for the “Best Maintained Dam”. This award is being given every year for the Best maintained dam during that year. 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 Maintained Dam in that year.
Preparation of Rules for flood regulation of reservoirs
Engineer-in-Chief, WRD and Chief Engineer (Gl.), PWD had insisted the Regional Chief Engineers of WRD to prepare rules for flood regulation for all reservoirs as given below.
Compendium of rules for Flood regulation Part-II was prepared in the year 1984 covering 41 reservoirs. At present TamilNadu has 89 WRD Reservoirs. Therefore,

  1. Compendium of Flood regulation for the Reservoirs which are not covered in the existing Compendium would be prepared within 3 months and send to Government.
  2. Also to update the rules of flood regulation with reference to present hydraulic parameters for the reservoirs covered in the existing Compendium within 3 months and send to Government.

Hence, it is proposed to finalise the draft rules for 48 Reservoirs initially which are not included in the existing Compendium of flood regulation rules, published in 1984.
The Superintending Engineer, Dam Safety Directorate is scrutinizing the draft flood regulation rules for the 48 reservoirs coordinating with the field Engineers of the reservoirs concerned.