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
D .  t = (h + 1)/(G + t)
Answer: Option B

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