Question

why are dam called multi purpose projects

Answer 1

Dam is a place where water is stored at a height in large volumes. They are called multipurpose projects because the water stored in them solves many purposes: Maintain the water level in the rivers and increase water level during droughts. Provide water to the agricultural fields by canals for irrigation.
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Answer 2

Dam is a place where water is stored at a height in large volumes. They are called multi purpose projects because the water stored in them solves many purposes:

=> Maintain the water level in the rivers and increase the water level during droughts.

=> Provide water to the agricultural fields by canals for irrigation