Irrigation Engineering
If A is the area of the surface, x̅ is the depth of its C.G. from the surface of the water and ω is the density of water, then

Total pressure on the surface is equal to ωx̅
Depth of the centre of pressure is 2/3H vertically below the surface
Depth of the point at which total pressure acts is equal to its moment of inertia divided by Ax̅
All listed here

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Irrigation Engineering
As per Lacey’s theory, the silt factor is

directly proportional to square root of average particle size
inversely proportional to average par¬ticle size
directly proportional to average par¬ticle size
not related to average particle size

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