Question Bank • QB_IDE_EXP_021 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Irrigation Water Conveyance and Application Methods

Subtopic: Surface, sprinkler and micro irrigation methods

Question Statement:

A sprinkler lateral has 10 sprinkler heads spaced $12\text{ m}$ apart. The spacing between laterals on the main line is $18\text{ m}$. Each sprinkler delivers $0.40\text{ L/s}$. The precipitation application rate of the system in $\text{mm/h}$ is ________ (round off to 2 decimal places).

Answer Key:

6.67

Step-by-Step Solution & Explanation

1. Area covered per sprinkler head $A$: $A = S_l \times S_m = 12\text{ m} \times 18\text{ m} = 216\text{ m}^2$ 2. Sprinkler discharge $q = 0.40\text{ L/s} = 0.40 \times 3600 = 1440\text{ L/h} = 1.44\text{ m}^3\text{/h}$. 3. Precipitation rate $R$: $R = \frac{q}{A} = \frac{1.44\text{ m}^3\text{/h}}{216\text{ m}^2} = 0.006667\text{ m/h} = 6.667\text{ mm/h} \approx 6.67\text{ mm/h}$
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