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
Pick up the correct statement from the following sentence

The escapes must lead the surplus water to natural drainages
Escapes are essential safety valves in a canal system
All of these
The escapes are aligned to take advantage of contours of lower values

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