Question Bank • QB_EXP_IDE_SCH_002 NAT • 1 Mark

Section 5: Irrigation and Drainage Engineering

Irrigation Scheduling & Soil Moisture Depletion

Subtopic: Gross irrigation requirement from application efficiency

Question Statement:

The net depth of irrigation water required to replenish the root zone to field capacity is $NIR = 80\text{ mm}$. If the field water application efficiency is $\eta_a = 75\%$, the gross irrigation requirement ($GIR$) is ________ $\text{mm}$ (round off to one decimal place).

Answer Key:

106.7

Step-by-Step Solution & Explanation

Gross irrigation requirement accounts for on-field deep percolation and runoff losses: $GIR = \frac{NIR}{\eta_a} = \frac{80}{0.75} = 106.7\text{ mm}$
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