Reading: Orifice gate
Also known as -
An orifice gate is a discharge gate installed at a depth of less than 25 m below the full water level at any given time. It is mainly used to regulate the water level of the dam lake and the amount of water flowing downstream as flood control. It is sometimes used as a permanent flood discharge. Gates are often located near the middle or slightly above the middle of the embankment when viewed from downstream of the embankment.
The gate itself, unlike the conduit gate, does not use a long discharge pipe.
The original meaning of "orifice" is "an opening through which a jet of fluid flows out.
Orifice gate of Eiheiji Dam
The part in the center that is discharging is the orifice gate.
Tamagawa Dam orifice gate
The hole in the center is the orifice gate.
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