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
For designing the venturi head,

Length of the throat should be 2.5 times the depth measured to F.S.L. in the main canal
All listed here
Minimum throat width should not be less than 60 cm
Width of the throat should not be less than one-third of the bed width of main canal

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