What is a dam ? Why do we seek to build large dams

What is a dam? Why do we seek to build large dams ? While building large dams, which three main problems should particularly be addressed to maintain peace among local people ? Mention them.

Answer

1. Dam is a barrier that is built across a river or a stream for storage of water.
2. Large dam can ensure the storage of adequate water for irrigation and also for generating electricity.
3. Social problem, economic problem and environmental problem.