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

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Hydraulics and Fluid Mechanics in ME
The depth of centre of pressure (h) for a vertically immersed surface from the liquid surface is given by (where IG = Moment of inertia of the immersed surface about horizontal axis through its centre of gravity, A = Area of immersed surface, and x = Depth of centre of gravity of the immersed surface from the liquid surface)

(IG/Ax̅) + x̅
(IG/x̅) - Ax̅
(Ax̅/IG) + x̅
(IG/Ax̅) - x̅

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