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- The dam is a barrier construct across the river to store water on its upstream side.
- Due to construction of a dam the water level of the river on its upstream is very much raised.
- Due to rise in water level large areas lying upstream of the dam get submerged.
- Dams are constructed to store the river water in form of an artificial lake or reservoir.
- The stored water can be utilized for generation of hydro-electric power, water supply.