Answer:
Reasons for their opposition are:
(i) Regulating and damming of rivers affect
their natural flow causing poor sediment flow and excessive sedimentation at
the bottom of reservoirs.
(ii) It results in rocky stream beds and
poorer habitats for the rivers' aquatic life.
(iii) Dams also fragment
rivers making it difficult for aquatic fauna to migrate, especially for
spawning (laying of eggs).
(iv) The reservoirs that are
created on the flood plains also submerge the existing vegetation and soil,
leading to its decomposition over a period of time.
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