Dams may also have bottom outlets with valves or gates which may be operated to release flood flow, and a few dams lack overflow spillways and rely entirely on bottom outlets.Ĭross-section of typical spillway with Tainter gates In contrast, an intake tower is a structure used to control water release on a routine basis for purposes such as water supply and hydroelectricity generation.Ī spillway is located at the top of the reservoir pool. 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. 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. Such features enable a spillway to regulate downstream flow-by releasing water in a controlled manner before the reservoir is full, operators can prevent an unacceptably large release later.
Spillways can include floodgates and fuse plugs to regulate water flow and reservoir level. Spillways ensure that water does not damage parts of the structure not designed to convey water. In the United Kingdom, they may be known as overflow channels. Chute spillway of Llyn Brianne dam in WalesĪ spillway is a structure used to provide the controlled release of water downstream from a dam or levee, typically into the riverbed of the dammed river itself.
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