Hydraulics and Fluid Mechanics in ME
When an internal mouthpiece is running free, the discharge through the mouthpiece is (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)

0.855 a. √2gH
0.5 a. √2gH
√2gH
0.707 a. √2gH

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Hydraulics and Fluid Mechanics in ME
Coefficient of resistance is the ratio of

Actual discharge through an orifice to the theoretical discharge
Actual velocity of jet at vena-contracta to the theoretical velocity
Area of jet at vena-contracta to the area of orifice
Loss of head in the orifice to the head of water available at the exit of the orifice

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