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A washout is the sudden erosion of soft soil or other support surfaces by a gush of water, usually occurring during a heavy downpour of rain (a flash flood) or other stream flooding. These downpours may occur locally in a thunderstorm (particularly in summer, when they are often nearly stationary), or over a large area, such as following the landfall of a tropical cyclone. If a washout occurs in a crater-like formation, it is called a sinkhole, and usually involves a leaking or broken water main or sewerage pipes. (Other types of sinkholes, such as collapsed caves, are not washouts.)
Widespread washouts can occur in mountainous areas after heavy rains, even in normally dry ravines. A severe washout can become a landslide, or cause a dam break in an earthen dam. Like other forms of erosion, most washouts can be prevented by vegetation whose roots hold the soil, and prevention of deforestation, which slows the flow of water. Retaining walls and culverts may also be used, although particularly severe washouts may even destroy these if they are not large or strong enough.
[edit] Effect on road and rail transport


A washout occurred on the Riverside and Great Northern Railway in Wisconsin Dells, Wisconsin, on June 11, 2004.


In road and rail transport, a washout is the result of a natural disaster where the roadbed is eroded away by flowing water, usually as the result of a flood. When a washout destroys a railroad's right-of-way, the track is sometimes left suspended in midair across the newly-formed gap, or it dips down into a ditch. The phenomenon is discussed in more detail under erosion.
In 2004, the remnants of Hurricane Frances and then Hurricane Ivan caused a large number of washouts in western North Carolina and other parts of the southern Appalachian Mountains, closing some roads for days, and parts of the Blue Ridge Parkway for months. Other washouts have also caused train wrecks where tracks have been unknowingly undermined. Motorists have also driven into flooded streams at night, unaware of a new washout on the road in front of them until it is too late to brake, and prompting a high-water rescue.
Major washouts can also ruin pipelines or undermine utility poles or underground lines, interrupting public utilities.

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ko đổi ... còn wash out thì hỏi bác chuotnuoc1 ấy
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