Question Bank • QB_IDE_SWP_007 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Water requirement of crops

Question Statement:

A crop has a base period $B = 100\text{ days}$ and duty $D = 1440\text{ ha/cumec}$. The total irrigation water depth required over the base period (delta $\Delta = \frac{8.64 B}{D}$) in metres is ________ (round off to 2 decimal places).

Answer Key:

0.60

Step-by-Step Solution & Explanation

From the duty-delta relationship: $\Delta = \frac{8.64 \cdot B}{D}$ Given: • $B = 100\text{ days}$ • $D = 1440\text{ ha/cumec}$ $\Delta = \frac{8.64 \times 100}{1440} = \frac{864}{1440} = 0.60\text{ m}$
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