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

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Hydraulics and Fluid Mechanics in ME
The Euler's equation for the motion of liquids is based upon the assumption that

The flow is continuous, steady and along the stream line
The fluid is non - viscous, homogeneous and incompressible
The velocity of flow is uniform over the section
All of these

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