The municipal corporation announced 30% cut in water supply in 18 of the city’s 24 wards on Friday after two main pipelines, which supply water from the Tansa Lake to the city, burst on Thursday.
This is the first major pipeline burst this year.
While repairs on the pipelines are on, the corporation is yet to decide how long the water cut would last.
Among the areas that would face water cut are the entire south Mumbai area, Worli, Dadar, Prabhadevi, Mahim, Bandra, Santacruz, Khar, Andheri, Malad, Goregaon, Borivali, Kandivali, Charkop, Dahisar, and parts of Kurla, Ghatkopar, Vikhroli, Bhandup and Mulund. While the Tansa (east) pipeline burst near Vadpe village near Chinchavli, the Tansa (west) pipeline sprung a major leak at Bhiwandi near Vadpada village.
The two 72-inch diameter pipelines supply 455 million litres of water from Tansa lake to the city every day.
V Bambale, civic hydraulic engineer, said: “We have isolated one of the two pipelines and are in the process of isolating the other one. We still can't determine how much time will the repairs take, because we are yet to know the extent of damage to the two pipelines.”
Though the civic officials failed to detect the exact cause for the pipes burst, a senior official said it could be because they were old. Both pipelines were laid in 1885.
"These pipelines are more than 125 years old and are corroded at stretches… they are bound to give way," said a senior civic official, requesting anonymity because he is not authorised to speak to the media.
Civic sources said that it would take at least 24 hours to 48 hours to fix both the pipelines. In 2009, the municipal corporation had initiated a project to replace main pipelines that carry water from the six lakes that supply water to the city to the reservoirs. Work on the project is still on.