23 July,2026 02:44 PM IST | Mumbai | mid-day online correspondent
Modak Sagar has become the fourth lake to overflow this monsoon. Pic/ X
Modak Sagar Lake, one of the seven reservoirs supplying drinking water to the Brihanmumbai Municipal Corporation (BMC) area, started overflowing at 2:07 am on Thursday, following continuous heavy rainfall across its catchment.
With this, Modak Sagar has become the fourth lake to overflow this monsoon, after Vihar, Tulsi and Tansa, further strengthening Mumbai's water reserves.
The reservoir has a maximum storage capacity of 12,892.5 crore litres (1,28,925 million litres) and reached full capacity after receiving sustained rainfall over the past few days.
The overflowing of Modak Sagar is expected to further improve the city's overall water stock as monsoon activity continues across Maharashtra.
Heavy monsoon showers over the past 24 hours have significantly boosted Mumbai's water reserves, with the city's seven lakes now holding 10,09,432 million litres (ML) of water, or 69.74 per cent of their total useful live storage capacity, according to the Hydraulic Engineer's Department at the Bhandup Complex.
The city's water stock rose sharply from 61.90 per cent on July 22 to 69.74 per cent on Thursday, July 23, registering an increase of 7.84 percentage points in just one day.
[mumbaiwaterstock]
Heavy rainfall continued across all major catchment areas supplying Mumbai's reservoirs.
Upper Vaitarna: 230 mm
Middle Vaitarna: 207 mm
Modak Sagar: 185 mm
Tulsi: 163 mm
Bhatsa: 123 mm
Tansa: 103 mm
Vihar: 103 mm
The combined storage of Upper Vaitarna, Modak Sagar, Tansa and Middle Vaitarna has reached 5,07,571 ML, or 73.08 per cent of their total useful live storage capacity.
Modak Sagar, built across the Vaitarna River in Shahapur taluka of Thane district, is one of the major sources of drinking water for Mumbai.
Located about 120 km from Mumbai, the dam is 548.64 metres long and 82.296 metres high.
The reservoir has a catchment area of 450.625 sq km and contributes 11.22 per cent of Mumbai's total water supply.
Modak Sagar is the fourth reservoir to overflow this monsoon. Earlier, Tansa Lake overflowed at 8:51 am on July 22, 2026, while Vihar Lake overflowed at 9 pm on July 7, followed by Tulsi Lake at 11:43 pm on the same day.
The Bhandup Complex recorded 110 mm rainfall in the last 24 hours, taking the season's cumulative rainfall to 2,116 mm.
The Hydraulic Engineer's Department said the Middle Vaitarna WSCPO gate has remained closed since July 6, while the release of water from Upper Vaitarna has remained suspended since the same day.
With four lakes already overflowing and water reserves nearing the 70 per cent mark, the city's water situation has improved considerably as monsoon activity continues across the catchment regions.
