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

- A. t = (h + 1)/(G + t)
- B. t = (h – 1)/(G + t)
**C. t = (h – 1)/(G – t)**- D. t = (h + 1)/G