Irrigation Engineering
Lacy's regime condition is obtained if

Silt charge in the channel is variable
Silt grade in the channel is variable
Discharge in the channel is variable
Channel flows in unlimited, incoherent alluvium of the same character as that transported material

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

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

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

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

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