Raid (hydraulic engineering)

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Invasion of the Möhnesee dam

In hydraulic engineering, an overflow is the discharge process over a weir , sometimes the weir itself is also referred to as an overflow. Similar to the measuring orifice , the overflow can be used to determine the flow rate. Essential in a raid is the transition from flowing to shooting (i.e. from slow to very fast flowing) drain; this transition occurs exactly at the overflow threshold .

The overflow, together with the drainage structure ( channel ) and the stilling basin, is a fundamental part of the flood relief .

The weir formula can be used to calculate overflows. The discharge coefficient takes into account the shape of the beam deflection.