Mumbai’s seven drinking-water reservoirs held 1,393,459 million litres, or 96.28 per cent of their combined live storage capacity, as of 6 am on Monday, September 7, according to the Hydraulic Engineers Department at the Bhandup Master Control Centre.
The latest stock is lower than the level recorded during the same period last year, when the reservoirs held 1,402,563 million litres, equivalent to 96.90 per cent of capacity. It is also below the September 2024 figure of 1,418,203 million litres, or 97.99 per cent of total live storage.
Among the seven reservoirs, Vihar Lake was at 100 per cent of its live storage capacity. Tansa stood at 98.41 per cent, Modak Sagar at 97.98 per cent, Bhatsa at 96.67 per cent, Middle Vaitarna at 96.64 per cent and Tulsi at 96.38 per cent. Upper Vaitarna had the lowest storage level at 91.93 per cent.
Bhatsa, Mumbai’s largest reservoir in the network, held 693,168 million litres. Upper Vaitarna held 208,724 million litres, while Middle Vaitarna had 187,026 million litres. The other reservoirs contained 142,769 million litres in Tansa, 126,319 million litres in Modak Sagar, 27,698 million litres in Vihar and 7,755 million litres in Tulsi.
Light showers continued across the catchment areas during the previous 24 hours. Bhatsa recorded the highest rainfall at 12 mm, followed by Modak Sagar at 11 mm, Upper Vaitarna at 10 mm, Tulsi at 8 mm, Middle Vaitarna at 5 mm, Tansa at 2 mm and Vihar at 2 mm.
The Bhandup Complex recorded 27.55 mm of rainfall during the same period, taking its cumulative seasonal rainfall to 2,755 mm. Cumulative monsoon rainfall at the reservoirs stood at 3,778 mm at Upper Vaitarna, 3,545 mm at Tulsi, 3,105 mm at Modak Sagar, 2,797 mm at Tansa, 2,787 mm at Middle Vaitarna, 2,572 mm at Bhatsa and 2,536 mm at Vihar.
The department said Vihar Lake has been overflowing since July 7. Tansa Dam, which had been overflowing until August 22, has since recorded a lower level. Modak Sagar’s water level also declined marginally on August 23.
The Middle Vaitarna WSCPO gate remains closed, while the release of water from Upper Vaitarna has been suspended since July 6, according to the Hydraulic Engineers Department. The latest reservoir figures will continue to form the basis for monitoring Mumbai’s municipal water supply position.
