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Reservoir
A reservoir is an artificial lake created by flooding land behind a dam. Some of the world's largest lakes are reservoirs.
Surveyors have to find river valleys which are deep and narrow; the valley sides can then act as natural walls. The best place for building a dam has to be determined. If necessary, humans have to be rehoused and/or historic sites have to be moved, e.g. the temples of Abu Simbel[?] before the construction of the Aswan Dam, creating Lake Nasser[?].
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