Irrigation Engineering
As compared to crest of the normal portion of the weir, the crest of the under sluice portion of weir is kept at

same level
any of the above depending on the design
lower level
higher level

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Irrigation Engineering
Effective precipitation for a crop may be defined as

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

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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 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
Total pressure on the surface is equal to ωx̅

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Irrigation Engineering
In a syphon aqueduct

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

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