nonrigid dam

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Embankment dam — An embankment dam is a massive artificial water barrier. It is typically created by the emplacement and compaction of a complex semi plastic mound of various compositions of soil, sand, clay and/or rock. It has a semi permanent waterproof natural … Wikipedia
Technological and industrial history of the United States — The technological and industrial history of the United States describes the United States emergence as one of the largest nations in the world as well as the most technologically powerful nation in the world. The availability of land and labor,… … Wikipedia
North America — North American. the northern continent of the Western Hemisphere, extending from Central America to the Arctic Ocean. Highest point, Mt. McKinley, 20,300 ft. (6187 m); lowest, Death Valley, 276 ft. (84 m) below sea level. 400,000,000 including… … Universalium

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