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

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Irrigation Engineering
Pick up the correct sequence of the part of a canal system from the following

Head works-main canal-branch canal-distributary-minor
Heads works-branch canal-main canal distributary, minor
Head works-main canal-branch canal-minor-distributary
Head work-distributary-branch canal-minor

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Irrigation Engineering
Effective precipitation for a crop may be defined as

Total precipitation minus the loss due to evaporation
Total precipitation minus the loss due to infiltration
Available water stored in soil within root zone of the crop
Total precipitation during the crop period

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