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
As per Lacey’s theory, the silt factor is

not related to average particle size
directly proportional to square root of average particle size
inversely proportional to average par¬ticle size
directly proportional to average par¬ticle size

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