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Levee § Natural levees; Meander – One of a series of curves in a channel of a matured stream; Oxbow lake – U-shaped lake or pool left by an ancient river meander; Pendant bar – fluvial landform formed on the downstream side of a weathering-resistant protrusion
The side of a levee in Sacramento, California. A levee (/ ˈ l ɛ v i / or / ˈ l ɛ v eɪ /), [a] [1] dike (American English), dyke (British English; see spelling differences), embankment, floodbank, or stop bank is an elevated ridge, natural or artificial, alongside the banks of a river, often intended to protect against flooding of the area adjoining the river.
Levees form as a result of the flooding process. Large amounts of rainfall cause the river to become too full during the flooding, where it overflows, carrying sediments into the floodplain. [ 2 ] As the flooding slows and stops, the sediments are deposited, with the largest deposited closer to the river channel and the smaller ones deposited ...
Flood (2001) defines a channel-levee system as a single channel with a levee at each side. [13] These levees are formed by the overspilling and flow stripping of turbidity currents. These are most likely to occur during sea level lowstands. A collection of these channels and levees along with overbank sediments form a channel-levee complex.
In geography and geology, fluvial sediment processes or fluvial sediment transport are associated with rivers and streams and the deposits and landforms created by sediments. It can result in the formation of ripples and dunes , in fractal -shaped patterns of erosion, in complex patterns of natural river systems, and in the development of ...
Levee 29 featured four flood control gates that controlled all the water entering Everglades National Park; before construction, water flowed in through open drain pipes. The period from 1962 to 1965 was one of drought for the Everglades, and Levee 29 remained closed to allow the Biscayne Aquifer —the fresh water source for South Florida—to ...
Artificial levees block spring flood water that would bring fresh water and sediment to marshes. Swamps have been extensively logged, leaving canals and ditches that allow salt water to move inland. Canals dug for the oil and gas industry also allow storms to move sea water inland, where it damages swamps and marshes.
Instead, the water then enters the back swamps, or form a yazoo stream. [11] Because yazoo streams are separated from the main river by natural levees, they flow and meander (streams and rivers rarely flow in straight lines) parallel to the main stream channel or river on the floodplain for a considerable distance.