Online Encyclopedia

Search over 40,000 articles from the original, classic Encyclopedia Britannica, 11th Edition.

LEVEE (from Fr. lever, to raise)

Online Encyclopedia
Originally appearing in Volume V16, Page 505 of the 1911 Encyclopedia Britannica.
Spread the word: del.icio.us del.icio.us it!

See also:

LEVEE (from Fr. See also:lever, to raise)  , an See also:embankment which keeps a See also:river in its channel . A river such as the See also:Mississippi (q.v.), draining a large See also:area, carries a See also:great amount of sediment from its swifter See also:head-streams to the See also:lower ground . As soon as a stream's velocity is checked, it drops a portion of its load of sediment and spreads an alluvial See also:fan in the lower See also:part of its course . This deposition of material takes See also:place particularly at the sides of the stream where the velocity is least, and the See also:banks are in consequence raised above the See also:main channel, so that the river becomes lifted bodily upwards in its See also:bed, and flows above the level of the surrounding See also:country . In See also:flood-See also:time the muddy See also:water flows over the river's banks, where its velocity is at once checked as it flows gently down the See also:outer See also:side, causing more material to be deposited there, and a See also:long alluvial See also:ridge, called a natural See also:levee, to be built up on either side of the stream . These ridges may be wide or narrow, but they slope from the stream's outer banks to the See also:plain below, and in consequence require careful watching, for if the levee is broken by a " See also:crevasse," the whole See also:body of the river may pour through and flood the country below . In 1890 the Mississippi near New See also:Orleans See also:broke through the Nita crevasse and flowed eastward with a current of 15 M. an See also:hour, spreading destruction in its path . The Hwang-ho river in See also:China is peculiarly liable to these inundations . The word levee is also sometimes used to denote a See also:riverside See also:quay or landing-place .

End of Article: LEVEE (from Fr. lever, to raise)
[back]
LEVECHE
[next]
LEVEE (from the French substantival use of lever, t...

Additional information and Comments

There are no comments yet for this article.
» Add information or comments to this article.
Please link directly to this article:
Highlight the code below, right click and select "copy." Paste it into a website, email, or other HTML document.