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2025-02-18T05:00:17Z

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	[[Category:Coastal and oceanic landforms]]		[[Category:Coastal and oceanic landforms]]
	{{Hydraulic-structures-stub}}		{{Hydraulic-structures-stub}}
			<gallery>
			File:River_Levee_Cross_Section_Figure.svg\|Cross section of a river levee
			File:Sacramento_River_Levee.jpg\|Levee along the Sacramento River
			File:Versterkt_talud._Locatie._Haven_van_Laaxum_002.JPG\|Reinforced embankment at the harbor of Laaxum
			File:Sacramento_River_broken_levee.jpg\|Broken levee on the Sacramento River
			File:GretnaLevee.jpg\|Levee in Gretna
			</gallery>

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2024-03-02T02:42:32Z

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'''Levee'''

A '''[[Levee]]''' is a natural or artificial slope or wall to prevent flooding of the land behind it. It is usually earthen and often parallel to the course of a river in its floodplain or along low-lying coastlines.

==Etymology==

The word ''levee'', from the French word ''levée'' (from the feminine past participle of the French verb ''lever'', "to raise"), originally referred to the raising of a siege by an army. It has since been applied to constructs that prevent flooding.

==Natural formation==

A natural [[Levee|levee]] occurs where sediment is deposited on the river bank, raising the level of the land adjacent to the river. This is caused by the slowing of water flow around the bends of a river, which causes sediment to be deposited on the inner side of the bend.

==Artificial levees==

Artificial levees are typically built by piling earth on a cleared, level surface. The surface is compacted, and a trench is often dug at the foot of the levee to prevent water from seeping under it. The levee is then covered with a layer of clay to prevent erosion, and grass is planted on top to further protect the levee from erosion.

==Levee failures==

Levees can fail in a number of ways. The most common is a [[Levee breach|levee breach]]. A breach can occur if the base of the levee is eroded by water flow, if the levee is overtopped by high water, or if the levee is physically damaged, for example by the impact of debris during a flood.

==See also==

* [[Floodplain]]
* [[Flood control]]
* [[Levee breach]]
* [[Coastal management]]

==References==

{{reflist}}

==External links==

* [http://www.levees.org Levees.org] - Information about the U.S. levee system

[[Category:Hydraulic engineering]]
[[Category:Flood control]]
[[Category:Coastal and oceanic landforms]]
{{Hydraulic-structures-stub}}

Levee - Revision history

Prab: CSV import

Prab: CSV import