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
In a syphon aqueduct

Canal passes over the drainage and H.F.L. of the drainage is above the bottom of the canal trough
Canal passes over the drainage and H.F.L. of the drainage is below the bottom of the canal trough
Drainage passes over the canal and F.S.L. of the canal is above the bottom of the drainage trough
Drainage passes over the canal and F.S.L. of the canal is below the bottom of the drainage trough

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