Mumbai Lake Levels Reach 89.05 Percent Useful Storage Capacity

Mumbai's water stock across its seven key lakes rose to 89.05 per cent of total useful live storage as of 6 am on August 11, according to data from the Hydraulic Engineer's Department. The reservoirs collectively hold 12,88,833 million litres (ML) of water out of a total storage capacity of 14,47,363 ML, reflecting a 0.17 percentage point increase over a 24-hour period.

Intermittent monsoon rainfall across the catchment areas has driven a steady improvement in the city's water reserves. However, the overall stock remains below the level recorded during the corresponding period last year, when storage stood at 92.20 per cent in 2024.

Among the individual reservoirs, Vihar and Tulsi are both at 100 per cent of their useful live storage. Tulsi holds 8,002 ML after receiving 16 mm of rainfall in 24 hours, while Vihar recorded 5 mm of rain. Both lakes began overflowing on July 7.

Modak Sagar and Tansa reservoirs are also near maximum capacity. Modak Sagar stood at 99.99 per cent capacity with 1,28,910 ML in stock, having started to overflow on July 23. Tansa reached 99.10 per cent capacity with 1,43,672 ML, after it began overflowing on July 22.

Middle Vaitarna recorded 91.87 per cent useful live storage with 1,77,792 ML after receiving 8 mm of rain in 24 hours, bringing its seasonal rainfall total to 2,378 mm. Its WSCPO gate was closed on July 6. Upper Vaitarna stood at 80.57 per cent capacity with 1,82,941 ML available, supported by 26 mm of recent rain that took its seasonal cumulative rainfall to 3,206 mm. Water release from Upper Vaitarna was stopped on July 6.

The combined storage of Upper Vaitarna, Vaitarna, Tansa, and Middle Vaitarna reached 6,33,413 ML, equivalent to 91.19 per cent of their combined useful live capacity. Bhatsa, the largest individual reservoir, stood at 86.43 per cent capacity, holding 6,19,719 ML.