Hydraulics and Fluid Mechanics in ME
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)

A1/2 × M2/3 × m × i
A × M × m1/2 × i2/3
A2/3 × M1/3 × m × i
A × M × m2/3 × i1/2

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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)

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

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