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

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

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

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

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Irrigation Engineering
For a standing crop, the consumptive use of water is equal to the depth of water

Transpired by the crop
Evaporated by the crop
Transpired and evaporated by the crop
Used by the crop in transpiration, evaporation and also the quantity of water evaporated from adjacent soil

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