The Noyyal rises from the Vellingiri hills in the Western Ghats and covers a total area of 3,500 km˛ (1351 mi˛), the basin is 180 km (112 mi) long and 25 km (16 mi) wide. Cultivated land in the basin amounts to 1,800 km˛ (695 mi˛) and the population density of the basin is 120 people per km˛ (311/mi˛) in the countryside, and 1000 people per km˛ (2590/mi˛) in the cities. During Northeast monsoon this 173 km (107 mi) long tributary of the Cauvery, can fill up 32 eries (tanks).
External links
A glorious system in peril (http://www.hinduonnet.com/thehindu/mp/2003/05/19/stories/2003051900900100.htm)
The Noyyal river, a tributary of the Cauvery, originates in the Western Ghats in the Coimbatore district, Tamilnadu and passes through two industrial cities, Coimbatore and Tirupur before it mixes with the Cauvery river.
The river is severely polluted by the industrial effluents and sewage released from Coimbatore and Tirupur.
The results of this study indicate that the Noyyal river system is contaminated with substances that are genotoxic to fish and earthworms, and that the comet assay has sufficient sensitivity to detect the genotoxicity of environmental samples.
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