A 15 per cent water cut will be implemented across Mumbai for 30 days from March 31 to fix a hole in a crucial supply tunnel, the Brihanmumbai Municipal Corporation (BMC) said on Tuesday.

Water has been leaking from the tunnel after it was recently punctured in Thane while digging a borewell, BMC said in a release.

According to the civic body, its Bhandup water complex, which takes care of 65 per cent of the total water supplied to Mumbai, receives about 75 per cent of its supply through this 15-km-long tunnel that has a diameter of 5,500 mm.