Geography

Chennai is situated on a flat coastal plain, as can be seen in this Landsat 7 map.(left image)

Chennai is located at 13.04° N 80.17° E on the southeast coast of India and in the northeast corner of Tamil Nadu.

Chennai and surrounding towns(right image)

It is located on a flat coastal plain known as the Eastern Coastal Plains. The city has an average elevation of 6 metres (20 feet), its highest point being 60 m (200 ft). Two rivers meander through Chennai, the Cooum River (or Koovam) in the central region and the Adyar River in the southern region. Both rivers are heavily polluted with effluents and trash from domestic and commercial sources.

The Adyar, which is much less polluted than the Cooum, is de-silted and cleaned periodically by the state government. A protected estuary of the Adyar forms the natural habitat of several species of birds and animals. The Buckingham Canal, 4 km (3 miles) inland, travels parallel to the coast, linking the two rivers. The Otteri Nullah, an east-west stream runs through north Chennai and meets the Buckingham Canal at Basin Bridge.Several lakes of varying size are located on the western fringes of the city. Red Hills, Sholavaram and Chembarambakkam Lake supply Chennai with potable water. Groundwater sources are mostly brackish.

The city's water supply has proved inadequate for its population, and an over-reliance on annual monsoon rains to replenish water reservoirs has compounded problems. There had been some attempts to pipe in water from other sources, such as the Veeranam, a water-rich place in Tamil Nadu or from the Krishna River in Andhra Pradesh. Water is a precious commodity in Chennai and this has given rise to private water tankers supplying many areas.

Alternative measures such as reverse osmosis and rainwater harvesting have been taken up. Chennai Metrowater has currently finalised a bid to construct a reverse osmosis plant with a capacity of 100 million litres per day (about 15 litres per person per day).The geology of Chennai comprises of mostly clay, shale and sandstone. The city is classified into three regions based on geology, sandy areas, clayey areas and hard-rock areas. Sandy areas are found along the river banks and the coasts. Clayey regions cover most of the city.

Hard rock areas are Guindy, Velachery, Adambakkam and a part of Saidapet. In sandy areas such as Tiruvanmiyur, Adyar, Kottivakkam, Santhome, George Town and the rest of coastal Chennai, rainwater run-off percolates very quickly. In clayey and hard rock areas, rainwater percolates slowly, but it is held by the soil for a longer time. The city's clayey areas include T.Nagar, West Mambalam, Anna Nagar, Kolathur and Virugambakkam.

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