Question

what are the environmental problems caused due to dams

Answer 1

The alteration of a river's flow and sediment transport downstream of a dam often causes the greatest sustained environmental impacts. Life in and around a river evolves and is conditioned on the timing and quantities of river flow. ... A damalso holds back sediments that would naturally replenish downstream ecosystems.

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Answer 2

large scale deforestation takes place .
animals have to leave their habitat .
floods and droughts may also happen the respective area.