Hydraulics and Fluid Mechanics in ME
The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)

(2/3) Cd × L.√2g [H1 - Ha]
(2/3) Cd × L. √2g [H15/2 - Ha5/2]
(2/3) Cd × L.√2g [H12 - Ha2]
(2/3) Cd × L. √2g [H13/2 - Ha3/2]

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Hydraulics and Fluid Mechanics in ME
In a forced vortex motion, the velocity of flow is

inversely proportional to the square of its radial distance from the axis of rotation
directly proportional to its radial distance from axis of rotation
directly proportional to the square of its radial distance from the axis of rotation
inversely proportional to its radial distance from the axis of rotation

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