Question

Although dams are beneficial to human populations because they provide large reservoirs of freshwater, what are they detrimental to?

Answer 1

Reservoir takes lot of land.People are displaced from natural habitat.

Explanation:

Natural flow of river is affected. damage to plants, trees have to be cut. Ecology is affected.
large water storage in new place causes Earth quakes.
If the dam bursts millions will be killed in populated countries.