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
Bligh's theory of seepage assumes

Equal weightage to the horizontal and vertical creep
Less weightage to horizontal creep than vertical creep
More weightage to horizontal creep than vertical creep
Loss of head follows the sine curve

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