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Periyar Discoloration
April 11 , 2019
2057 days
1154
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- The Periyar River in Kerala has turned black near the Pathalam Regulator cum Bridge.
- The discolouration was due to the poor quality of water as a result of eutrophication.
- When excessive nutrients reach the waterbody, it will lead to algal bloom.
- A few days later, algae will die and decay, resulting in a foul smell and discolouration of water.
- Industrial effluents and household drains are equally responsible for this pollution.
Periyar River
- Periyar is the longest river and the river with the largest discharge potential in Kerala.
- Its major tributaries are - Mullayar River, Muthirapuzha River, Cheruthoni River, Perinjankutti River and Edamala River.
Mullaperiyar dam
- The Mullaperiyar dam is constructed at the confluence of the Periyar and Mullayar to create the Periyar Thekkady lake and reservoir.
- Water from here is diverted to Tamilnadu via a tunnel. The diverted water is used to generate power.
- Then it is let into the Suruliar river (a tributary of the Vaigai River) thereby resulting in an inter-basin transfer of water.
- The dams falling within Tamil Nadu in the Periyar basin are the Upper Nirar Weir and the Lower Nirar Dam.
- Mullaperiyar dam was constructed between 1887 and 1895 by John Pennycuick.
- Kerala’s largest hydroelectric power project Idukki Dam lies on Periyar river.
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