Question

What is marids and demarids of dams?

Answer 1

merits:
*control floods
*regulate the flow of water
*help in irrigation during the dry seasons
*water navigation
*trees are systematically planted across reservoirs leading to afforestation
*Fisheries
*dams conserve soil by slowing down the speed of water
*hydeal power

demerits:
*a variety of flora and fauna as well as human settlements are submerged under water of reservoirs created by dams
*annual floods do not occur because of dams and the soil is not renewed and the soil becomes more saline
*large scale displacement of local communities. the movements like Narmada Bachao Andolan and Tehri Dam Andolan started against this injustice.
*sedimentation on the river beds makes it difficult for aquatic life to migrate