Question

why the dams are constructed on the river​

Answer 1

to cross from one side to another side....

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Answer 2

Answer:

Dam, structure built across a stream, a river, or an estuary to retain water. Dams are built to provide water for human consumption, for irrigating arid and semiarid lands, or for use in industrial processes. ... Dams can also provide a lake for recreational activities such as swimming, boating, and fishing.

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