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floodplain |
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floodplain, level land along the course of a river formed by the deposition of sediment during periodic floods. Floodplains contain such features as levees, backswamps, delta delta [from triangular shape of the Nile delta, like the Greek letter delta], a deposit of clay, silt, and sand formed at the mouth of a river where the stream loses velocity and drops part of its sediment load. ..... Click the link for more information. plains, and oxbow lakes. Floodplains may be extensive, such as below the conflux of the Ohio and the Mississippi, where they have a width up to 80 mi (130 km). Rivers with extensive floodplains are the Nile, Ganges, Danube, and Po. Floodplains are generally very fertile, thus making them rich agricultural lands. The disadvantage of farming on a floodplain is the natural hazard of floods flood, inundation of land by the rise and overflow of a body of water. Floods occur most commonly when water from heavy rainfall, from melting ice and snow, or from a combination of these exceeds the carrying capacity of the river system, lake, or ocean into which it ..... Click the link for more information. . In the United States there has been extensive house construction on floodplains in recent years, necessitating the construction of new dams to control small, annual floods. |
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Senior engineer Dennis Mak said a body of water sits on a 50-year flood plain and floodway near the northeast end of the city. For the old-fashioned way of building a gigantic floodway, you don't necessarily have to know the [wetlands] system in all the details" says Dijkman. Stephen Stone, natural resources park ranger with the Army Corps, says dumping is a major problem at his project, the Atchafalaya Basin Floodway System in Louisiana. |
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floodway
