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Kerala's River Periyar Witnesses Decolourisation

Published on April 10, 2019
River Periyar in Kerala is again witnessing decolourisation.

Kerala's River Periyar Witnesses Decolourisation


  • The decolourisation of River Periyar which provides drinking water to Kochi city and adjoining areas has become the cause of worry for the people and government of Kerala.
  • The water turned pitch black in one stream, it was milky near the Pathalam regulator-cum-bridge.

Cause of the change in colour- Eutrophication

  • The pollution control Board (PCB) has attributed the change in colour to the poor quality of water as a result of eutrophication.
  • PCB has stated that huge quantities of organic load in the form of sewage from nearby townships are regularly reaching the river system.
  • This is contributing to the eutrophication, resulting in the change of colour.

About River Periyar:

  • River Periyar flows in the state of Kerala.
  • It originates in the Western Ghats and flows north for a short distance to Periyar Lake.
  • Periyar Lake is an artificial reservoir created by Mullaperiyar Dam across the river.
  • From the Periyar Lake, a tunnel carries water through mountains to the Vaigai River in Tamil Nadu, where it is used for irrigation.
  • Further downstream Idukki dam is constructed across the river. 
  • The river descending out of the mountains into the coastal plain, empties into the Arabian Sea.

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