Spillway The channel or passageway around or over a dam through which excess water is diverted. If the flow is controlled by gates, it is a controlled spillway, if the elevation of the spillway crest is the only control, it is an uncontrolled spillway. The following lists some typical spillways: 1 Auxiliary Spillway (Emergency Spillway) A secondary spillway designed to operate only during exceptionally large floods, 2 Fuse Plug Spillway An auxiliary or emergency spillway comprising a low embankment or a natural saddle designed to be overtopped and eroded away during normal inflow and flood flows, 3 Primary Spillway (Principal Spillway) The principal or first-used spillway during normal inflow and flood flows, 4 Shaft Spillway (Morning Glory Spillway) A vertical or inclined shaft into which flood water spills and then is conducted through, under, or around a dam by means of a conduit or tunnel, if the upper part of the shaft is splayed out and terminates in a circular horizontal weir, it is termed a “bellmouth“ or “morning glory” spillway, 5 Side Channel Spillway A spillway whose crest is roughly parallel to the channel immediately downstream of the spillway, 6 Siphon Spillway A spillway with one or more siphons built at crest level, this type of spillway is sometimes used for providing automatic surface-level regulation within narrow limits or when considerable discharge capacity is necessary within a short period of time.
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Author of the Water Words Dictionary source of text: Gary A. Horton
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