If the height of the hydraulic gradient line above the floor of thickness t is h

Question

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

Options:

A . t = (h + 1)/(G + t)

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

C . t = (h - 1)/(G - t)

D . t = (h + 1)/G

Answer: Option C

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