FLOOD MITIGATION of MITHI RIVER, MUMBAI Background the Mithi River Originates in the Hills East of the Sanjay Gandhi National Park

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FLOOD MITIGATION of MITHI RIVER, MUMBAI Background the Mithi River Originates in the Hills East of the Sanjay Gandhi National Park

Central Water and Power Research Station, Pune FLOOD MITIGATION OF MITHI RIVER, MUMBAI Background The Mithi River originates in the hills east of the Sanjay Gandhi National Park. It carries the overflow discharge from Tulsi-Vihar-Powai Lake system and runoff from its catchments. The river is of short length of 17.922 km, which flows from its origin at Vihar Lake and join the Arabian sea near the Mahim Bay. The tidal reach of the river is about 7 km from Mahim Bay upto Air India complex. The total catchment area of Mithi River basin is 7295 ha which also includes the 907 ha area of the major tributary, the Vakola Nalla system and 70 ha of Mahim bay. Catchment Area of Mithi River Basin Studies Conducted Outcome and Benefits After the deluge of 26th July 2005, the The work of channelization, to the extant possible, Mumbai Metropolitan Region Development is in progress and the widening of old bridges and Authority (MMRDA) reviewed various options construction of new bridges is also being planned. for avoiding the recurrence of the floods in the Mithi River. CWPRS has also taken up the work of CWPRS carried out 1-D mathematical model construction of a physical model of the Mithi River studies and recommended channelisation of including construction of a hangar (80 m x 26.50 the Mithi River by providing adequate depths m) in which the entire length of Mithi River and widths in various reaches of the River, including the portion of Arabian Sea and Mahim including increasing the water way under Bay were reproduced. various bridges. Central Water and Power Research Station, Pune Physical Model Numerical Model result.

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