Civil Engineering MCQAE Level Civil Engineering
The field irrigation requirement (FIR) for a crop is related to consumptive use (CU), effective rainfall (ER), and soil moisture change (SM) by:
Irrigation EngineeringCrop Water RequirementMEDIUM
Choose the correct answer
A
FIR = CU - ER + SM
B
FIR = CU + ER + SM
C
FIR = CU x ER / SM
D
FIR = ER - CU + SM
Correct Answer
A. FIR = CU - ER + SM
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FIR = Net Irrigation Requirement (NIR) = CU - ER - SM_change (if soil moisture is initially below field capacity, SM_change is negative, increasing requirement). Gross Irrigation Requirement (GIR) = NIR / irrigation efficiency.
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