Lok Sabha Question No. 155 (STARRED), answered on 2018-12-20
Subject: Removal of Silt from Dams/ Reservoirs/Lakes
Ministry: WATER RESOURCES, RIVER DEVELOPMENT AND GANAGA REJUVENATION
Asked by: BHAGWANTH KHUBA, RAKSHA NIKHIL KHADSE

## GOVERNMENT OF INDIA MINISTRY OF WATER RESOURCES, RIVER DEVELOPMENT & GANGA REJUVENATION

## LOK SABHA STARRED QUESTION NO. *155

ANSWERED ON 20. 12.2018

## REMOVAL OF SILT FROM DAMS/ RESERVOIRS/LAK ES

## *155. SHRI BHAGWANTH KHUBA SHRIMATI RAKSHATAI KHADSE

Will the Minister of WATER RESOURCES, RIVER DEVELOPMENT AND GANGA REJUVENATION be pleased to state:

- (a)  whether the  Government  has  made  any  survey/study  about  the  silt  accumulation  in dams/reservoirs/lakes across the country and if so, the details thereof along with the have reduced the water holding capacity more than 50 per cent;
- (b) whether the G overnment has any proposal to remove silt therefrom and received any prop from certain States for adopting new technology for the purpose;
- (c) if so, the details thereof, Statewise and the action taken on the said proposals;
- (d) whether the Governme nt is establishing any new mechanism using modern technology to remo silt from such dams/reservoirs to bring them back to their full water holding capacity a details thereof including the details of such technology; and
- (e) whether the Gove rnment has planned any silt - removal programme in the country and if so, the details thereof, State - wise?

## ANSWER

THE  MINISTER  OF  STATE  FOR  WATER  RESOURCES, RIVER  DEVELOPMENT  AND GANGA REJUVENATION & PARLIAMENTARY AFFAIRS

( SHRI ARJUN RAM MEGHW AL )

- (a) to (e)   A statement is laid on the Table of the House.

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STATEMENT REFERRED IN REPLY TO PARAS (a) TO (e) OF LOK SABHA STARRED QUESTION NO.  *155 TO BE ANSWERED ON 20 th DECEMBER, 2018 ON 'REMOVAL OF  SILT  FROM  DAMS/  RESERVOIRS/LAKES'  RAISED  BY  SHRI  BHAGWANTH KHUBA AND SHRIMATI RAKSHATAI KHADSE

( a)  Central  Water  Commission  (CWC)  has carried  out sed imentation  assessment  studies  of  243 reservoirs  through  Hydro  g raphicsurveywhich  assesses  current  gross  capacity and  live  storage capacity assessment studies of 124 reservoirs through remote sensing t echnique.

As per the study , the r eservoirs have experienced annual rate of siltation in live s zone in the range of 0 - 1%  normally.  Six  reservoirs viz. Sanandro, Gujarat (57.33% in 30  ye Baira,  HP  (84.27%  in  30  years),  Mhaswad,  Maharashtra  (52.04%  in  102  years),  Kundah,  T Nadu (63.07% in 22 years), Nizamsagar, Telangana (60.47% in 62 years), Chandan, Bihar ( 52.24% in 37 years) have experienced a loss ofmore than 50% of gross storage capacity. (b) to (e) W hile designing a storage project, provision for the Dead Storage is kept to acc the silt comin g from upstream catchment. The d ead storage is so k ept as to accommodate t he silt for 100 years of project life assuming a certain design rate of siltation which is based on c Any deposition of silt in the Dead Storage Zone does not affect the performance of the reservoir. Desiltation o f dams to increase its storage capacity is primarily the responsibilit owners who are generally State Govts .or Central / State PSUs. - siltation assisted mprovem ent  Project(DRIP),    provision  has  been  kept  for  need - based

Usually de - silting of large dams is n ot techno - economically feasible . However, de work has been taken up at limited scale by some of the dam owners. Under World Bank Dam  Rehabilitation  &  I desiltation of dams.

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