Hydraulics and Fluid Mechanics in ME
The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)

1.855 aH.√(2g)
0.855 a.√(2gH)
5.85 aH.√(2g)
1.585 a.√(2gH)

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