Question Bank • QB_IDE_EXP_096 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Water requirement of crops

Question Statement:

A sugarcane crop has a seasonal consumptive use of $ET_c = 1200\text{ mm}$. Effective rainfall during the growing season is $P_e = 400\text{ mm}$. If the overall irrigation efficiency is $60\%$, calculate the gross irrigation requirement ($GIR$) in $\text{mm}$.

Answer Key:

1333.33

Step-by-Step Solution & Explanation

Net irrigation requirement: $NIR = ET_c - P_e = 1200 - 400 = 800\text{ mm}$ Gross irrigation requirement: $GIR = \frac{NIR}{\eta} = \frac{800}{0.60} \approx 1333.33\text{ mm}$
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