Question Bank • QB_IDE_EXP_077 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Irrigation Water Conveyance and Application Methods

Subtopic: Irrigation scheduling

Question Statement:

A crop has a daily peak evapotranspiration rate of $ET_c = 6.0\text{ mm/day}$. The root zone depth is $D = 60\text{ cm}$ with an available water storage capacity of $120\text{ mm}$. If irrigation is scheduled when $50\%$ of available water is depleted, calculate the irrigation interval in $\text{days}$.

Answer Key:

10

Step-by-Step Solution & Explanation

Readily available water (RAW): $RAW = 0.50 \times 120\text{ mm} = 60\text{ mm}$ Irrigation interval: $I = \frac{RAW}{ET_c} = \frac{60\text{ mm}}{6.0\text{ mm/day}} = 10.0\text{ days}$
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