MUMBAI: BMC will have to shell out Rs 3,105 crore to execute the Gargai dam project. The cost includes construction, forest and private land acquisition charges, consultancy fees, rehabilitation of projectaffected persons and detail engineering fees to be paid. When the project was conceptualised in 2012, its estimated cost was pegged at Rs 1,820 crore.A proposal listing the total amount for the project will be tabled before the civic standing committee meeting on Wednesday.The project has been proposed to increase water supply to Mumbai by 440MLD. BMC has been planning the Gargai, Pinjal and Damganga projects, which are expected to augment the city’s water supply tremendously, for many years.The Gargai dam, spread across 849 hectares, will be constructed in Oghade village, Palghar , on the Gargai river, a tributary of Vaitarna. It involves construction of the dam, and connecting it to Modak Sagar dam, which supplies water to Mumbai.According to the proposal, the dam will be 972 metres wide and 61 metres high. A civic official said that out of 840-odd hectares required for the project, 170 is private land, while the rest is a forest area. “We have chalked out a proposed to rehabilitate the villagers who will be affected due to project work,” said the official.The last dam constructed by BMC was Middle Vaitarna, which supplies 455MLD water to Mumbai. Work on the dam was completed in 2012.The estimated cost of the dam was Rs 2,700 crore. Water from Middle Vaitarna dam is released into the lower lake, Modak Sagar, in a controlled manner. From there, it is drawn for treatment and then supplied to the city.