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Kosasthalaiyar River


'Kosasthalaiyar River, also known as Kortalaiyar in Manali a distributary, is one of the three rivers that flow in the Chennai metropolitan area. The 136-kilometre (85 mi) river originates near pallipet in thiruvallur District and drains into the Bay of Bengal. Its northern tributary Nagari river originates in Chitoor district of Andhra Pradesh and joins the main river in the back waters of Poondy dam. Its catchment area spreads in Vellore, Chitoor, North Arcot, Thiruvallur and Chennai districts. It has catchment area in North Arcot District with a branch near Kesavaram Anicut and flows to the city as Cooum River and the main Kosasthalaiyar River flows to Poondi reservoir. From Poondi reservoir, the river flows through Thiruvallur District, enters the Chennai metropolitan area, and joins the sea at Ennore creek. There are two check dams across the river at Tamaraipakkam and Vallur. The excess discharge in the river is controlled by the Tamarapakkam Anicut located across the river in the downstream of Poondi reservoir. Vallur Anicut is a small check dam constructed near Minjur across the river to control water levels and feed irrigation channels in the area. It flows to a distance of 16 kilometres (10 mi) in the Chennai metropolitan area. The total catchment area of the river is 3,757 kilometres (2,334 mi), and the bed width ranges from 150 to 250 metres (490 to 820 ft). The discharge capacity of the river is 110,000 cubic metres per second (3,900,000 cu ft/s), and the anticipated flood discharge capacity is about 125,000 cubic metres per second (4,400,000 cu ft/s).

Galeru Nagari irrigation project is under execution to supply Krishna river water from Srisailam reservoir in Nagari basin of Chitoor district.


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