Hydraulics and Fluid Mechanics in ME
If the surface of liquid is convex, men

There is no cohesion pressure
Cohesion pressure is increased
Cohesion pressure is decreased
Cohesion pressure is negligible

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Hydraulics and Fluid Mechanics in ME
The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)

Q = Cd × bH₁ × √(2gh)
Q = Cd × b (H2 - H1) × √(2gh)
Q = Cd × bH2 × √(2gh)
Q = Cd × bH × √(2gh)

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