ancient dams...in height. Their skill lay in the comprehensive collection and storage of water and in its transport and distribution by aqueducts. At least two Roman dams in southwestern Spain, Proserpina and Cornalbo, are still in use, while the reservoirs of others have filled with silt. The Proserpina Dam, 12 metres (40 feet) high, features a masonry-faced core wall of concrete backed by earth that is...
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