Dear Student,
Man-made water-bodies are formed by constructing a dam across a flowing river in order to regulate the flow of water.These are known as reservoirs.
These artificial lakes are constructed to store water for power generation,irrigation,and can be put to domestic and industrial use.
These are also very effective constructions to control unexpected floods.
Eg : Guru Gobind Sagar . It supports the Bhakhda Nangal Hydel Project.
Regards
Jaya