The civic body warned that the six lakes, from where Mumbai draws its supply, have enough water to tide the city over for less than a month. Even on Wednesday, when several parts of Mumbai received strong showers, the catchment areas got an average of only 4mm of rain.
"The cuts have been necessitated by lack of rain in the catchment areas. The water stock has been declining. The BMC will review the situation in another 15 days and decide if the cuts should continue," said additional municipal commissioner Sanjay Deshmukh.
The 20% cut, civic officials explained, will be in the duration of the supply. So, if a housing society got water for three hours (or 180 minutes), its supply will now be restricted to about 2.5 hours (or 36 minutes less). By official estimates, this will cause a water cut of 10-15%.
Water levels in the six lakes—Modak Sagar, Tansa, Vihar, Tulsi, Upper Vaitarna and Bhatsa—are close to the lowest draw-able limits. The BMC normally takes 3,750 million litres of water every day from them, but it will now extract approximately 375-400 million litres less. Reducing the withdrawal further by a sizable margin, officials said, may disturb the pressure in the water reservoirs.
The city needs 12.5 lakh million litres of water in the lakes to see it through the year; currently, they have 1.1 lakh million litres left. By this time last year, the catchment areas had received an average of 800mm of rain; this year, they have received just 150mm.
"Though we are approving the water cuts, the BMC must plan for such a situation in advance. In 2009, when we suffered a similar crisis, the civic body decided to clean and maintain all borewells, but nothing has been done. The rainwater-harvesting scheme too exists only on paper," said Shiv Sena corporator Trishna Vishwasrao. Corporators want the areas at the far end of the distribution network to be provided water tankers because the pressure of the supply to them will be low during the cuts.
The BMC said that municipal wards of Mulund and Ghatkopar, where it managed to bring 24X7 water supply, will again get water during the old timings.
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