Allied & ICAR Exam Bank • ALLIED_1232 NAT • 2 Marks

Section 5: Irrigation and Drainage Engineering

Irrigation Efficiencies

Subtopic: Storage Efficiency

Question Statement:

Before an irrigation event, the crop root zone required 80 mm of water to bring it back to field capacity. The irrigation applied stored 68 mm of water in the root zone. The water storage efficiency $\eta_s$ (in %) is:

Answer Key:

85.0

Step-by-Step Solution & Explanation

Water storage efficiency $\eta_s = \frac{\text{Water stored in root zone}}{\text{Water needed in root zone}} \times 100 = \frac{68}{80} \times 100 = 85.0\%$.
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