Irrigation Engineering
The measure to remove water logging of land, is

To reduce percolation from canals and water courses
Both (a) and (b)
To increase outflow from the ground water reservoir
Neither (a) nor (b)

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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

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
A divide wall is provided

Parallel to the axis of weir and downstream of it
At an inclination to the axis of weir
At right angle to the axis of weir
Parallel to the axis of weir and upstream of it

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