Hydraulics and Fluid Mechanics in ME
The discharge over a rectangular notch is (where b = Width of notch, and H = Height of liquid, above the sill of the notch)

(2/3) Cd × b × √(2g) × H3/2
(2/3) Cd × b × √(2g) × H2
(2/3) Cd × b × √(2gH)
(2/3) Cd × b × √(2g) × H

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Hydraulics and Fluid Mechanics in ME
The total energy of a liquid particle in motion is equal to

Kinetic energy - (pressure energy + potential energy)
Pressure energy + kinetic energy + potential energy
Pressure energy - (kinetic energy + potential energy)
Potential energy - (pressure energy + kinetic energy

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