Irrigation Engineering
The scour depth D of a river during flood, may be calculated from the Lacey's equation

D = 0.47 (Q/f)1/2
D = 0.47 (Q/f)
D = 0.47 (Q/f)1/3
D = 0.47 (Q/f)2/3

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Irrigation Engineering
As per Lacey’s theory, the silt factor is

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

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