Irrigation Engineering
If the height of the hydraulic gradient line above the floor of thickness t is h and the specific gravity of the material of the floor is G, the minimum thickness t of the floor downstream of the crest-wall, is given by the equation

t = (h - 1)/(G + t)
t = (h + 1)/(G + t)
t = (h + 1)/G
t = (h - 1)/(G - t)

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Irrigation Engineering
Effective precipitation for a crop may be defined as

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

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Irrigation Engineering
Pick up the correct statement from the following and answer

In a level crossing, a crest with its top at the canal F.S.L. is provided across the drainage at its up-stream junction with canal
In a level crossing a regulator is provided across the drainage at its down-stream
All of these
In a level crossing, a cross regulator is provided on the canal below the crossing

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