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

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

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Irrigation Engineering
The flow-mass curve is graphical representation of

Discharge and time in chronological order
Discharge and percentage probability of flow being equaled or exceeded
Cumulative discharge, volume and time in chronological order
Cumulative discharge and time

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