Key Highlights
- Stalin on Monday (January 19, 2026) laid the foundation stone for the Mamallan reservoir, proposed as Chennai’s sixth drinking water source and the State’s first freshwater reservoir along the coast at Vada Nemmeli, on East Coast Road.
- The ₹342.60-crore project in the Kovalam basin, covering the land parcel between Thiruvidanthai and Kokilamedu, would be implemented by the Water Resources Department (WRD) to create the reservoir spread over 5,161.27 acres and with a storage capacity of 1.65 thousand million cubic feet.
- The reservoir would have an annual storage capacity of 2.25 tmcft when filled twice and a potential to supply 170 million litres a day (mld) to Chennai.
- The site would be bound by ECR on one side and Rajiv Gandhi Salai on another.
- Highlighting the historical significance of the region, the Chief Minister said the reservoir was named after Pallava ruler, Narasimhavarman I, also known as Mamallan, who founded Mamallapuram.
