Overview
- The Hydraulic Engineer's Department reported that Mumbai's seven supply reservoirs held 8,35,919 million litres, or 57.75% of live capacity, in the 6 am update on Tuesday, July 21.
- Bhatsa, the city's largest source, recorded the biggest 24-hour rise and held 3,73,983 ML (52.16%), and the Upper Vaitarna–Modak Sagar–Tansa–Middle Vaitarna group together reached about 61.36% of their combined capacity.
- Smaller city reservoirs Vihar and Tulsi have been at 100% and overflowing since the night of July 7, producing local runoff and traffic disruption in low-lying neighbourhoods.
- Operational controls that began on July 6 remain in place, with the Middle Vaitarna WSCPO gate closed since 2 pm on July 6 and Upper Vaitarna releases suspended since 10 am on July 6 to balance storage and downstream flood risk.
- The IMD continues to flag active monsoon conditions and further catchment rainfall could push reservoir levels higher, improving water security for the season but requiring sustained management of releases and local flood precautions.