Mumbai’s seven water-supply lakes held 96.41 per cent of their combined live storage capacity as of 6 am on September 8, according to the latest report of the Hydraulic Engineers Department at the Master Control Centre in Bhandup Complex.
The lakes contained 1,395,392 million litres against a combined useful capacity of 1,447,363 million litres. The current storage level is marginally below the corresponding levels recorded in the previous two years, when the lakes were at 97.23 per cent capacity on September 8, 2025, and 97.75 per cent on the same date in 2024.
Vihar Lake was full at 100 per cent of its useful storage capacity, holding 27,698 million litres. It received 1 mm of rainfall in the preceding 24 hours, taking its cumulative seasonal rainfall to 2,537 mm.
Modak Sagar stood at 97.65 per cent, with 125,893 million litres stored against a useful capacity of 128,925 million litres. Its water level fell by 0.05 metres over the previous 24 hours despite 3 mm of rainfall. The lake’s cumulative seasonal rainfall was 3,108 mm.
Tansa was at 98.49 per cent capacity, holding 142,887 million litres against a useful capacity of 145,080 million litres. Its level remained unchanged during the 24-hour period. The lake received 15 mm of rainfall, taking its seasonal total to 2,812 mm.
Bhatsa, Mumbai’s largest lake by capacity, was at 97.05 per cent. It held 695,912 million litres against a useful capacity of 717,037 million litres. Its level rose by 0.10 metres after the lake received 8 mm of rainfall, while cumulative seasonal rainfall reached 2,580 mm.
Tulsi Lake stood at 96.18 per cent, with 7,739 million litres stored against a useful capacity of 8,046 million litres. Its level fell by 0.01 metres despite 5 mm of rainfall in the preceding 24 hours. Its seasonal rainfall total was 3,550 mm.
Upper Vaitarna recorded the lowest storage level among the seven lakes at 91.93 per cent. It held 208,724 million litres against a useful capacity of 227,047 million litres. The level remained unchanged after 6 mm of rainfall, taking the lake’s cumulative seasonal rainfall to 3,784 mm, the highest recorded among the seven lakes.
Middle Vaitarna was at 96.39 per cent, with 186,540 million litres against a useful capacity of 193,530 million litres. Its level fell by 0.08 metres, the sharpest single-day decline among the lakes, despite 19 mm of rainfall. Its seasonal rainfall total stood at 2,806 mm.
The combined storage of Upper Vaitarna, Vaitarna, Tansa and Middle Vaitarna was 95.60 per cent of their useful capacity, with 664,044 million litres held against 694,582 million litres. The corresponding figure was 98.21 per cent on September 8, 2025, and 98.20 per cent in 2024.
The report recorded 2 mm of rainfall at Bhandup Complex during the day, taking its seasonal total to 2,757 mm. It also noted that the Middle Vaitarna WSCPO gate was closed on July 6 at 2 pm, while releases from Upper Vaitarna were stopped at 10 am the same day.
Several lakes had overflowed earlier in the monsoon. Vihar began overflowing on July 7 at 9 pm, followed by Tulsi at 11.43 pm the same day. Tansa Dam began overflowing on July 22 at 8.51 am, while Modak Sagar Dam overflowed from July 23 at 2 am. With the monsoon season nearing its end, the latest report places Mumbai’s lake storage at a high level for the months ahead.
