Siphon spillway

SIPHON SPILLWAY This spillway consists of one or a number of units of conduits formed by inverted U-tubes. The initial discharge through the conduits is similar to that of a weir. when air is drawn away from above the end over the crest, the discharge starts flowing by siphonic action. The inside of the bend of inverted U-tube is at normal reservoir level. When water level in the reservoir rises, the water first flows as for the weir spillway. when air inlet is block by rising water, siphonic action starts and spillway starts discharging with full capacity.   Spillway continues to discharge with full capacity unless the reservoir level drops below the air inlet pipe, when air enters the conduit and breaks the siphonic action. Siphon spillway can be classified into two categories. (i) Saddle siphon spillway. (ii) Volute siphon spillway.   1. Saddle Siphon Spillway. Saddle siphon spillway can…

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