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

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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
Absence of aeration of soil from root zone of the plant
Regular supply of water to plants from the water table by capillary action
None of these

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