Natural Levee

natural levee

[′nach·rəl ′lev·ē]
(geology)
An elongate embankment compounded of sand and silt and deposited along both banks of a river channel during times of flood.

Natural Levee

 

a gently sloping bank that forms in the part of the floodplain adjacent to the channel, where the flow of floodwater from the channel to the floodplain is slowed down and coarse-grained material, primarily sand, is deposited. On large flatland rivers, such as the Mississippi, natural levees may be up to 5–6 m high and 4.5–5 km wide.

References in periodicals archive ?
The newly acquired tribal property is on part of a natural levee that extends northwest from the former Thibault Plantation to the Clinton National Airport.
Perilous Place, Powerful Storms begins with the history of New Orleans' chronic flood problem, which was accentuated as the city expanded into low-lying areas, that is, away from the natural levee.
The levee at the Sauve plantation upstream gave way, and water careened off Metairie Ridge, a relict river in which sedimentary deposits had created a crescent-shaped natural levee (see map, p.
Unlimited hydroplanes roar by at speeds of up to 200 miles per hour, while families picnic under the trees on Madison's natural levee.
The transects, with a combined length of 1500 m followed a moisture and elevation gradient from a mesic natural levee (53.
Digging into a high natural levee paralleling the Mississippi River, University of Wisconsin-Madison archaeologists have discovered an ancient campsite or village that recurrently was occupied by a procession of native cultures for almost three millennia.
And natural levees, back swamps and coastal swamps between 100 million and 84 million years ago
Extensive floodplain wetlands along the creek are maintained by small natural levees.
Before European settlement, trees occurred on the natural levees created by the Mississippi River and its distributaries, and on beach ridges called "cheniers" (from the French word for oak) formed on the mudflats along the Gulf coast.
It seems interesting that undersea flows have at least one characteristic different from rivers: "While river floods on land can create natural levees a few meters tall, the levees formed by [undersea] turbidity currents can grow up to 100 m[eters] high" ("Hidden Canyons" SN: 1/1/05, p.
Before the Civil War, lowland residents started raising the natural levees.