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dam
Gordon Dam, Southwest National Park, Tasmania, Australia Credit: Wikimedian Noodle snacks.

dam:

A thick wall or barrier built across a river to control the flow of water. Dams are built of earth and rock, or concrete. The water held in dams can be used as a source of hydroelectric power, irrigation, or drinking water. If a dam bursts, severe flooding can cause great damage to communities down-river.