"Modak Sagar, which supplies 440 million litres of water to Mumbai every day, started overflowing at 6.32 am," said a statement by the Municipal Corporation of Greater Mumbai (MCGM).
The capacity of Modak Sagar is 1,28,925 million litres.
An official from MCGM's hydraulic department attributed overflowing to the good rains in the last week of June in the catchment areas.
"We are quite confident that remaining six reservoirs too would get filled upto their optimum capacity," the official said, as the monsoon is still in an early stage.
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Bhatsa is the largest among these, followed by Upper Vaitarna. Both come under the state government while the others are maintained by the civic body. Modak Sagar is the fifth-largest one.
The MCGM supplies 3,750 million litres of water every day to the island city and suburbs, which still falls short of the actual demand of 4,200 million litres.
The total water stock in seven reservoirs needs to be 14.47 lakh million litres by the end of monsoon so that it suffices for Mumbai's needs for the rest of the year.
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