Modak Sagar lake, one of the seven reservoirs that supply potable water to Mumbai and its suburbs, has started overflowing following incessant rains in the catchment area, an official said on Friday, reported PTI.

The Modak Sagar lake built on the Vaitarna river in neighbouring Thane district started overflowing at 10.52 pm on Thursday night, he said. This is the fourth lake, after Vihar, Tansa and Tulsi, to overflow this monsoon season.