How do dams and reservoirs work?

Dams and reservoirs are structures that provide water storage. A dam is a barrier built across a river or other body of water, forming a reservoir behind it. Water is diverted from the source into the reservoir and can then be used for irrigation, drinking water, hydroelectric power production, recreation, or other purposes. The water in the reservoir is usually held back by a rock or concrete wall, allowing it to accumulate over time.

Through a system of valves, water is released from the reservoir as needed. This allows the water to be used when it is most needed and prevents flooding. Additionally, dams and reservoirs often provide recreational opportunities, such as boating, fishing, and swimming.