(Feature Image: Alarming situation at Srisailam Dam, says Telangana; Warns NDSA of potential catastrophe. Source: Telangana Today, Feb. 2025)

The visit of chairman of National Dam Safety Authority (NDSA) to Srisailam and Nagarjunsagar dams on Krishna River belonging to Andhra Pradesh and Telangana has brought out very worrying reports. These are two of the largest dams in India. This is symptomatic of the situation of dam safety across the country.

Srisailam dam was damaged during unprecedented floods in first week of Oct 2009 with washing away large amount of cement concrete from the apron and plunge-pool of the dam, but the repair work has still not been taken up even though there is risk to the stability of the dam. The discussion is still about source of funds and NDSA chairman has asked AP to initiate some work using AP’s own funds and get the expenses reimbursed afterwards. This is a hardly confidence inspiring situation. Any mishap on this project can start a chair reaction that can engulf all projects right upto Krishna barrage at Vijaywada.

(Feature Image: Medigadda barrage of KLIS. Source: South First)

The National Dam Safety Authority (NDSA) expert committee report under chairman Shri J Chandrashekhar Iyer on the controversial Kaleshwaram project has at long last been submitted this last week to the Telangana govt vide DO letter dated April 24, 2025, from Shri Anil Jain, NDSA chairman. One of the intriguing aspects of this episode is that the NDSA expert committee submitted the report to the Ministry of Jal Shakti in December 2024 and it has taken almost four months for the report to be submitted to the executing authority, the Telangana Govt. Why should it take any time at all for the NDSA expert committee report to reach the state government, leave aside the 4 months it has taken.

(Feature Image: Infographic taken from Farakka now boomerangs on India: Source: TBS News, Oct. 2019)

The 2304 m long Farakka dam on Ganga in Murshidabad district in W Bengal was commissioned on Apr 21 1975 and completes 50 years today. The dam needs an independent review to assess the costs, benefits and impacts of the dam, both projected and actual and to decide about the need and form of its continued existence.

(Feature Image: Skymet predicts normal monsoon with 103% rainfall of the long-period average. Source: Business Today)

The private forecasting agency Skymet has forecast Normal SW Monsoon rainfall across India on Apr 8, 2025, a week before IMD comes out with its forecast. This advance forecast by private agency, compared to IMD raises question as to how come the private agency with much more limited resources is able to achieve this.

In any case, the forecast of about 3% above normal rainfall in June Sept 2025 is welcome. The rainfall distribution forecast, both across the four months and across the four regions is also good if it comes true.

(Feature Image: Merging point of of Badiyar gaad (left) and Yamuna river (right) at Gangani in Badkot, Uttarakhand. BS Rawat/SANDRP)

New research published this week reveals a startling change: the oxygen levels in inland waters has been dramatically reducing since 1900, due to human activities including big dams and pollution. This condition leads to dead fish, collapsing food chains and reducing water quality, among other impacts.

There are simultaneous processes ongoing in inland waters leading to production and consumption of oxygen. The location and processes for both the production and consumption of oxygen has been changing during 1900 to 2010. The Global oxygen consumption in inland waters, net of production has gone up by over 100% from 0.26 Pg/year in 1900 to 0.53 Pg/ year in 2010. While earlier climate change was considered major contributor to this reduction, new research shows it is big dams and pollution that are much bigger contributors. Inland waters now pull nearly 1 billion tons of oxygen from the atmosphere every year — half as much as the entire ocean emits back.