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write any four disadvantages of multi purpose river valley project

Disadvantages of Multi-purpose projects are as follows:

  • construction of mega dams like this in forest areas would lead to displacement of various tribals
  • large hydroelectric dams release methane into the atmosphere because trees and other plants settle to the bottom when the reservoir is first flooded
  • deprive thousands of people of their livelihood
  • forest lands lost
  • migratory fishes affected

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Its disadvantages are:-

1) displacement of hundreds, thousands if not millions of people
2) the flooding brought rich soil to the effected areas which will now need to use fertilizers
3) these fertilizers and other pollutants may damage the river ecology and pollute the new lakes
4) may damage or destroy river based fisheries
5) may damage or destroy estuary based fisheries
6) create tensions between neighboring countries

 

Hope this helps......

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  1. They displace a large number of population.
  2. They cover a large area of cultivable land and forest area.
  3. They stop aquatic fauna migration.
  4. They can cause water borne diseases. 
  5. Sometimes,they can cause floods.
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