Question Bank • QB_IDE_EXP_010 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Measurement of infiltration, soil moisture and irrigation water infiltration

Question Statement:

A root zone of depth $1.0\text{ m}$ has available water capacity $AWC = 150\text{ mm}$. If the Management Allowed Depletion ($MAD$) is $50\%$, and daily crop evapotranspiration is $5.0\text{ mm/day}$, the irrigation interval in days is ________ (answer in integer).

Answer Key:

15

Step-by-Step Solution & Explanation

1. Readily Available Moisture ($RAM$): $RAM = MAD \times AWC = 0.50 \times 150\text{ mm} = 75\text{ mm}$ 2. Irrigation Interval $T$: $T = \frac{RAM}{ET_c} = \frac{75\text{ mm}}{5.0\text{ mm/day}} = 15\text{ days}$
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