THE HINDU River Periyar witnessed decolorisation


  • The River Periyar in Kerala is witnessing decolorization.
  • The water turned pitch black in one stream, it was milky near the Pathalam regulator-cum-bridge.
  • The Pollution Control Board (PCB) has attributed the change in colour to the poor quality of water as a result of eutrophication.


  • 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, tunnel carries water through mountains to the Vaigai River in Tamil Nadu, where it is used for irrigation.
  • urther downstream Idukki dam is constructed across the river. The river descending out of the mountains into the coastal plain and empties into the Arabian Sea.
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