Chennai Reservoir Bund Faces Repeated Damage After Heavy Rain And Rising Water Levels
Chennai’s Cholavaram reservoir has suffered fresh damage to its earthen bund following heavy rainfall, highlighting recurring structural vulnerabilities. Water Resources Department officials have implemented temporary protective measures, including tarpaulin coverings, to prevent further erosion. Built in 1891 and repeatedly raised to boost capacity to 108 million cubic feet, the reservoir now faces renewed concerns over safety and long-term maintenance, prompting plans for a ₹120 crore comprehensive rehabilitation.
The Cholavaram reservoir, located in Tiruvallur district, is one of Chennai’s primary sources of drinking water. Over the decades, its embankment has been heightened from 18.33 metres to 19.96 metres to accommodate rising storage demands. However, the combination of geological factors and the earthen materials used in construction makes the bund particularly prone to slips, cracks, and surface erosion, especially during monsoon rains.“Rain-related cracks and downstream gullies are being repaired by the contractor at their own cost during the defect liability period,” said C Podupanithilagam, Chief Engineer of the WRD, Chennai region. Current interventions are temporary, involving cement-bonded concrete blocks and protective tarpaulin sheets, aimed at stabilising the affected sections while more permanent solutions are prepared.
A long-term rehabilitation plan has been drawn up following structural assessments by the Central Water Commission and the Dam Safety Directorate. The project, estimated at ₹120 crore, received an initial sanction of ₹40 crore from the state government, with work beginning in February this year. Officials emphasise that comprehensive strengthening is necessary to prevent repeated damage and safeguard Chennai’s water supply during the increasingly volatile monsoon season.Experts point to gaps in governance and maintenance as factors exacerbating the reservoir’s condition. “After water resources were transferred to the state, there has been limited focus on upkeep, as the reservoir does not generate revenue,” said J Saravanan, a hydrogeologist. He noted that the separation of responsibilities—WRD maintaining the reservoir while Metrowater draws water for supply—reduces accountability and efficiency. “A unified authority managing both supply and maintenance could reduce recurring structural risks,” he added.
Cholavaram’s repeated vulnerabilities illustrate broader urban infrastructure challenges in Chennai. With growing population pressures and climate-driven rainfall variability, timely investment in structural rehabilitation and integrated water management is essential. Experts suggest that combining technical upgrades with holistic governance strategies could not only secure drinking water supplies but also align with Chennai’s vision of building resilient, inclusive, and sustainable urban environments.
