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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