Irrigation Engineering
Instantaneous unit hydrograph is a hydrograph of
i) unit duration
ii) unit rainfall excess
iii) infinitely small duration
iv) infinitely small rainfall excess
The correct answer is

(i)and(iv)
(iii) and (iv)
(ii) and (iii)
(i) and (ii)

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

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

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