Irrigation Engineering
Lacy's regime condition is obtained if

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

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Irrigation Engineering
Effective precipitation for a crop may be defined as

Available water stored in soil within root zone of the crop
Total precipitation during the crop period
Total precipitation minus the loss due to infiltration
Total precipitation minus the loss due to evaporation

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