Irrigation Engineering
If Δ is the depth of water in metres, B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is

Δ = (8.6 B/D)
D = Δ (8.64 D/B)
B = Δ (8.64 B/D)
D = (8.6 Δ/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 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
All listed here

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Irrigation Engineering
A water-logged land is found suitable for cultivation due to

Ease of tillage for preparation of the field for optimum condition of germination
Regular supply of water to plants from the water table by capillary action
None of these
Absence of aeration of soil from root zone of the plant

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