Spillway 4
Spillway 4 : A structure over or through which flood flows are discharged. 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. * Auxiliary Spillway (Emergency Spillway): A secondary spillway designed to operate only during exceptionally large floods. * Fuse Plug Spillway: An auxiliary or emergency spillway comprising a low embankment or a natural saddle designed to be overtopped and eroded away during flood flows. * Primary Spillway (Principal Spillway): The principal or first-used spillway during normal inflow and flood flows. * 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. * Side Channel Spillway: A spillway whose crest is roughly parallel to the channel immediately downstream of the spillway. * Siphon Spillway: A spillway with one or more siphons built at or near the crest of the dam. 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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