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We typically build a dam to hold water back and store it for use in water supply, irrigation, hydropower, or flood control. But occasionally we must let some water go. Whether or not we need it downstream or the impounded water behind the dam is simply too full to store any more, almost every dam needs a spillway to securely discharge water. The spillway is a crucial part of any dam and frequently the most complex component. So how does it work?
Writing/Editing/Production: Grady Hillhouse
Thumbnail Photo: Doug Letterman (CC BY 2.0)