Spillway
A spillway is a structure used to provide the controlled release of water from a dam or levee, typically downstream into the dammed river. In the United Kingdom, it may be known as an overflow channel. A spillway ensures that water does not damage parts of the structure not designed to convey water.
Spillways can include floodgates and fuse plugs to regulate water flow and reservoir level. Such features enable a spillway to regulate downstream flow, allowing dam operators to release water in a controlled manner before the reservoir is full, thereby preventing an unacceptably large release later.
Other uses of the term "spillway" include bypasses of dams and outlets of channels used during high water, and outlet channels carved through natural dams such as moraines.
Water normally flows over a spillway only during flood periods, when the reservoir has reached its capacity and water continues entering faster than it can be released through penstocks or intake towers used to control water release on a routine basis for purposes such as water supply for irrigation and hydroelectricity generation.
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