Hydrology and Dam Features
Impoundment of Mithi River, 20 km north of Mumbai, was effected to store the rainwater from a catchment area of 18.96 km2 to create the Vihar Lake. The Powai-Kanheri hill ranges form the catchment area, which drains the rain water into the lake. For this purpose, three earthen embankment dams with a masonry spillway section were constructed to create a reservoir of 9200 million gallons capacity at the full reservoir level of 80.42 metres. The lake has a maximum water depth of 34 m and a minimum of 12 m. The lakes water spread area is 7 km2. The dam height was raised in 1872 resulting in increase of water supply from 32 million gallons (catering to a population of 0.7 million) to 36 million gallons.
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