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Coulee (or coulée) is applied rather loosely to different landforms, all of which refer to a kind of valley or drainage zone. The word ''coulee'' comes from the Canadian French ''coulée'', from French word ''couler'' meaning "to flow". The term is often used interchangeably in the Great Plains for any number of water features, from ponds to creeks. In southern Louisiana the word ''coulée'' (also spelled ''coolie'') originally meant a gully or ravine usually dry or intermittent but becoming sizable during rainy weather. As stream channels were dredged or canalized, the term was increasingly applied to perennial streams, generally smaller than bayous. The term is also used for small ditches or canals in the swamp. ==Types and examples== #The dry, braided channels formed by glacial drainage of the Scablands of eastern Washington, such as Grand Coulee and Moses Coulee. #The furrowed moraines channeling rain runoff in the area east of the Coteau du Missouri in the western United States and western Canada at the base of the Rocky Mountains. #In the western United States, tongue-like protrusions of solidified lava, forming a sort of canyon. #In Wisconsin, it is applied to valleys. These valleys tend to have high, steep walls. "Hollow" is used as a synonym, often for the smallest of such valleys. The term is also applied to the greater La Crosse, Wisconsin metropolitan area (i.e. the "Coulee Region"〔http://www.waymarking.com/waymarks/WM52CT_The_Coulee_Region_La_Crosse_WI〕), rather much like "Twin Cities" is applied to Minneapolis-Saint Paul. #The Gassman Coulee Trestle 〔http://www.ghostsofnorthdakota.com/2010/05/19/gassman-coulee-trestle/〕supports commercial and Amtrak (Empire Builder) trains, SW of Minot ND. The coulee may have been a contributing factor to the flooding of the Souris River in June 2011. In some parts of Louisiana coulees are not concreted but rather sheer sided large ditches that collect smaller ditch runoff. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「coulee」の詳細全文を読む スポンサード リンク
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