TB dam gate chain upgrade set to wrap by June 20

Munirabad (Koppal): Work on installing chains for the crest gates of the Tungabhadra dam — a key component of the reservoir’s safety and modernisation — is progressing rapidly and is likely to be completed between June 15 and 20.

During a recent visit to the dam, Hosapete MLA HR Gaviyappa said fabrication of all 33 gates has been successfully completed. He added that the old and rusted upper mechanical system of the gates is being fully replaced with a modern setup.

The dismantling and re-erection of all 33 gates was completed in 123 days, from Dec 24, 2025, to April 25, 2026. Trial runs of the newly installed gates have also been successfully carried out, while the remaining finishing works are in the final stages.

The project includes replacement of 68 lifting chains and 100 bevel gear units. Though a detailed assessment found the existing chains structurally sound, deputy chief minister DK Shivakumar, during his visit on May 3, 2026, said the government chose to replace all chains as a precautionary measure.

Third-party quality inspection agencies from Hyderabad have been engaged for testing and monitoring. The total cost of replacing all 33 spillway gates, including chain links and quality inspection, is estimated at around Rs 51 crore.

According to the Tungabhadra Board, new chains have already been installed for two gates, while work on 15 gates is expected to be completed by the end of May.

TB dam executive engineer N Chandrashekhar said chains for 17 gates are now ready, while those for the remaining gates are expected to arrive in the first week of June.

Each crest gate weighs nearly 50 tonnes, while the two chains attached to each gate weigh between 1.8 and 1.9 tonnes each, taking the total to around 55 tonnes. Officials said installation is being carried out under strict safety protocols.

TB Board officials have assured that, following the repairs, the reservoir will function safely for at least the next 40 years.

Referring to the proposed Navali alternate reservoir project, Gaviyappa said nearly 30 tmcft of silt has accumulated in the Tungabhadra reservoir, underscoring the need for an alternative storage project.

He added that construction of a new reservoir could take 10 to 15 years, including approvals from the Central Water Commission. A delegation of legislators is expected to meet the chief minister soon to push for initiation of the Navali project.