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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.
Wing dam in a man-made river bed. A wing dam or wing dike is a man-made barrier that, unlike a conventional dam, only extends partway into a river.These structures force water into a fast-moving center channel which reduces the rate of sediment accumulation, while slowing water flow near the riverbanks.
River groynes (spur dykes, wing dykes, or wing dams) are often constructed nearly perpendicular to the riverbanks, beginning at a riverbank with a root and ending at the regulation line with a head. They maintain a channel to prevent ice jamming, and more generally improve navigation and control over lateral erosion, that would form from meanders .
World War I: British diagram for the construction of revetted trenches - the revetment here is the part forward of the standing soldier. According to the U.S. National Park Service, and referring mostly to their employment in the American Civil War, a revetment is defined as a "retaining wall constructed to support the interior slope of a parapet.
The program involved building access roads to the banks to allow for the cleaning and clearing operations, clearing the banks of informal settlers and other encroachments, demanding the local industries along the riverbanks to set up water treatment facilities in order improve the river's water quality, planting various flora and building ...
The Jiangnan region, at the Yangtze River Delta, has a long history of constructing polders. Most of these projects were performed between the 10th and 13th centuries. [ 10 ] The Chinese government also assisted local communities in constructing dikes for swampland water drainage. [ 11 ]
The River and Harbor Act of 1930 authorized the construction of 67.8 miles of levee along the south shore of Lake Okeechobee and 15.7 miles of levee along the north shore. The U.S. Army Corps of Engineers constructed the levees between 1932 and 1938 with crest heights ranging from +32 to +35 feet, National Geodetic Vertical Datum (NGVD).
This category includes articles on barriers used to protect land from flooding by water, whether river or ocean. They may be named dikes, seawalls, levees, flood walls, etc. For volcanic dikes, see Category:Dikes (geology).