what is a dam built on ?
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In modern dam engineering, the choice of materials is usually between concrete, earthfill, and rockfill. Although in the past a number of dams were built of jointed masonry, this practice is now largely obsolete and has been supplanted by concrete.
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Dams are usually built using concrete, or natural materials such as earth and rock, and in cases such as the Hoover Dam and the Three Gorges, are major engineering projects with a construction programme lasting many
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