CBSE Class 10 Answered

Multipurpose projects include the construction of large dams which of late have come under security and opposition scanner due to the following reasons:

1. Large dams affect the natural flow of rivers. This results in hampering the flow of sediments. Excessive accumulation of sediments in the reservoirs causes damage to the marine life.
2. The dams on the flood plains submerge the vegetation and soil leading to its gradual decomposition.
3. It further results in floods due to the deposition of sediments in the reservoirs.
4. It causes destruction of the forest areas and the displacement of the tribal and local communities leading to the destruction of rich biodiversity of our country.

It has been suggested by various environmentalists that instead of building large dams, small reservoirs like check dams should be built. This will recharge the underground water apart from fulfilling the needs of irrigation without causing any environmental damage.