(a) the total number of dams in the country, State-wise;
(b) whether dams get damaged due to deposition of silt and if so, the details thereof;
(c) the funds spent on removing silt from dams and on their maintenance during each of the last three years and the current year, State-wise; and
(d) the names of the dams that broke during the said period?
THE MINISTER OF STATE FOR WATER RESOURCES, RIVER DEVELOPMENT AND GANGA REJUVENATION & PARLIAMENTARY AFFAIRS
(SHRI ARJUN RAM MEGHWAL)
(a) Central Water Commission (CWC) maintains National Register of Large Dams (NRLD) as per information provided by State Govts/ Dam owners. As per NRLD, there are 5701 large dams (5264 completed and 437 under construction). The State-wise details of large dams is at Annexure-I.
(b) Silt accumulation in the reservoirs is a natural process. While designing a storage project, provision for Dead Storage is kept to accommodate the silt coming from upstream catchment. The dead storage is so kept as to accommodate the silt for100 years of project life assuming a certain design rate of siltation which is based on certain factors. Any deposition of silt in the dead storage zone does not affect the performance of the reservoir. Dam’s storage capacity gets reduced if rate of siltation is more than assumed/expected rate of siltation.
(c) Desiltation and maintenance of dams is primarily the responsibility of dam owners who are generally State Government or Central/State PSUs. However, desiltation work has been taken up at limited scale by some of the dam owners. Under World Bank assisted Dam Rehabilitation and Improvement Project (DRIP), there is need-based provision of desiltation of dams. De-siltation works of two dams viz. Kundahapalam dam and Papanasam Weir in Tamil Nadu at a cost of Rs. 18.18 Crores and Rs. 13.25 Crores respectively have been awarded in the year 2017. Desiltation of one dam of Uttarakhand Jal Vidyut Nigam Limited (UJVNL) viz. Asan Barrage at a cost of Rs. 1.83 Crores has been carried out in 2017-18.
(d) No dam failure is reported by State Governments / dam owners during the last three years.
*****
Annexure-I
Statement referred to in reply to part (a) of Unstarred Question No. 2675 to be answered in Lok Sabha on 27.12.2018 regarding Removal of Silt from Dams.
Statewise detail of large dams
S.No. States/ UT Completed
dams Dams Under
Construction
1 Andaman & Nicobar Islands 2 -
2 Andhra Pradesh 142 25
3 Arunachal Pradesh 1 3
4 Assam 3 1
5 Bihar 24 2
6 Chhattisgarh 248 10
7 Goa 5 -
8 Gujarat 620 12
9 Himachal Pradesh 19 1
10 Haryana 1 -
11 Jammu & Kashmir 14 3
12 Jharkhand 50 29
13 Karnataka 230 1
14 Kerala 61 1
15 Madhya Pradesh 899 7
16 Maharashtra 2069 285
17 Manipur 3 1
18 Meghalaya 8 -
19 Mizoram - 1
20 Nagaland 1 -
21 Odisha 199 5
22 Punjab 14 2
23 Rajasthan 209 2
24 Sikkim 2 -
25 Tamil Nadu 116 -
26 Telangana 163 21
27 Tripura 1 -
28 Uttar Pradesh 115 15
29 Uttarakhand 16 9
30 West Bengal 29 1
GRAND TOTAL 5264 437