Irrigation Engineering
If Δ is the depth of water in metres, B is the number of days of base period and D is the duty in hectare/cumec, the relationship which holds good, is

D = Δ (8.64 D/B)
D = (8.6 Δ/B)
B = Δ (8.64 B/D)
Δ = (8.6 B/D)

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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
directly proportional to average par¬ticle size
inversely proportional to average par¬ticle size

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