A dam is a strong wall built across a river, having a [[1]] behind it.

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A dam is a strong wall built across a river, having a reservoir behind it. A dam is a structure that blocks, directs, or slows the flow of water; it frequently creates a reservoir, lake, or impoundment. The reservoir is referred to as the "dam," not the building. Most dams contain a part known as a spillway or weir where it is anticipated that water will flow continuously or periodically over or through. Dams can be categorised based on their structure, intended use, or height. Dams are categorised as timber, embankment, or masonry dams, with several subtypes, depending on the design and materials employed. Dams can be divided into big and significant dams based on their height or defined as low, medium, and high dams.

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