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Channel straightening and levee construction eliminate these areas of deposition, creating unfavorable conditions for riparian vegetation recruitment. By preventing overbank flooding, levees reduce the amount of water available to riparian vegetation in the floodplain, which alters the types of vegetation that can persist in these conditions. [ 2 ]
Another is the fact that channelized streams are almost invariably straightened. For example, the channelization of Florida's Kissimmee River has been cited as a cause contributing to the loss of wetlands. [5] This straightening causes the streams to flow more rapidly, which can, in some instances, vastly increase soil erosion.
Robinson Creek in Boonville, California, had highly eroded stream banks prior to initiation of a stream restoration project.. Stream restoration or river restoration, also sometimes referred to as river reclamation, is work conducted to improve the environmental health of a river or stream, in support of biodiversity, recreation, flood management and/or landscape development.
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A cutoff channel can be engineered for the purpose of navigation, traditionally for water mill leats and for controlling the possibility of any future flood were done on the lower reaches away from the tide. These meander cutoffs straighten a river. [8] Many rivers are transformed by humans, becoming less sinuous. [6]
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Channels also describe the deeper course through a reef, sand bar, bay, or any shallow body of water. An example of a river running through a sand bar is the Columbia Bar—the mouth of the Columbia River. A stream channel is the physical confine of a stream consisting of a bed and stream banks. Stream channels exist in a variety of geometries.