Aforebay is an artificial pool of water in front of a larger body of water. The larger body of water may be natural or human-made.[1]
Forebays have a number of functions. They are used in flood control to act as a buffer during floodingorstorm 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[2]) in order to keep the reservoir clean. This entails the use of a dam built upstream of the main reservoir, called a forebay damorpre-dam. Forebays 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.[1]
A forebay can also be a reservoir from which water is taken to run machinery such as turbines.[3]
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