Allied & ICAR Exam Bank • ALLIED_1206 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Irrigation Efficiencies

Subtopic: Application Efficiency

Question Statement:

A stream of $50\text{ L/s}$ is diverted to an agricultural plot for 2 hours (total delivered volume = 360 m$^3$). If the water stored in the crop root zone during irrigation is 270 m$^3$, the water application efficiency $\eta_a$ (in %) is:

Answer Key:

75.0

Step-by-Step Solution & Explanation

Volume delivered $= 50\text{ L/s} \times 7200\text{ s} = 360,000\text{ L} = 360\text{ m}^3$. Stored in root zone $= 270\text{ m}^3$. $\eta_a = \frac{270}{360} \times 100 = 75.0\%$.
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