Spillway
Appearance
A spillway is a construction to release extra water from a dam, in a way that this water does not cause damage. Each dam has a maximum capacity. Water that is more than this capacity cannot be stored, and has to be released. A spillway allows to do this in a safe way.
Gallery
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Outlet-type spillway when in use
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Outlet-type, unused
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Overflow type
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Looking down an overflow spillway
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Overflow type