A dam is a structure that controls the flow of a river or stream. Upstream of a dam, the water level is higher than the original river level (creating a head difference that can be used for hydropower), and  the upstream pool creates a storage reservoir to trap high flows in the wet season so they can be used over a longer period when the weather is dry.

Typical dam and its compomnents
Example of a dam

Published by hydrogray

Hydropower specialist

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