What are the disadvantages of multipurpose river projects?

Disadvantages of multipurpose river projects:

  • Affect the natural flow of rivers causing poor sediment flow.
  • Excessive sedimentation at the bottom of the reservoir, resulting in rockier stream beds and poorer habitats for the aquatic life of rivers.
  • Makes it difficult for aquatic fauna to migrate, especially for spawning, submersion of the existing vegetation and soil leading to its decomposition over a period of time. 
  • Multi-purpose projects and large dams have also been the cause of many new environmental movements like the Narmada Bachao Andolan and the Tehri Dam Andolan etc

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