The Tulsi lake, one of the seven lakes which provide water supply to Mumbai, started overflowing on Monday night due to continuous heavy rains in the city.

The lake, located in northern Mumbai, contributes one per cent of total water storage for the city. Vihar lake, located in the city, and the other five lakes – upper Vaitarna, Middle Vaitarna, Modak Sagar, Tansa, and Bhatsa situated on Thane - Nashik border, have less than 40 per cent storage. The seven lakes can store up to 14.47 lakh million litres water, which lasts 10 months.