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Forebay (reservoir)
A forebay is an artificial pool of water in front of a larger body of water. The larger body of water may be natural or man-made.〔(''What is a Forebay?'' ) at www.wisegeek.com. Retrieved on 13 Jun 2013〕
Forebays have a number of functions. They are used in flood control to act as a buffer during flooding or storm surges, impounding water and releasing in a controlled way into the larger waterbody. They may be used upstream of reservoirs to trap sediment and debris (sometimes called a sediment forebay〔(''Sediment Forebays'' ) at www.greenworks.tv. Accessed on 14 Jun 2013〕) in order to keep the reservoir clean. This may entail the use of a pre-dam. They may also be used upstream of lakes to prevent siltation. Some forebays are used simply to create a natural habitat for flora and fauna, to counterbalance the environmental impact of a dam or reservoir. Forebays vary greatly in size depending on their situation and purpose.〔
== References ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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