Allied & ICAR Exam Bank • ALLIED_0495 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Irrigation Efficiencies

Subtopic: Irrigation Efficiencies

Question Statement:

Water Distribution Efficiency $\eta_d$ proposed by Christiansen is given by:

Options:

  • (A) $\eta_d = 100 \left(1 - \frac{\bar{y}}{d}\right)$
  • (B) $\eta_d = 100 \left(1 + \frac{\bar{y}}{d}\right)$
  • (C) $\eta_d = 100 \frac{d}{\bar{y}}$
  • (D) $\eta_d = 100 \left(1 - \frac{d}{\bar{y}}\right)$

Answer Key:

A

Step-by-Step Solution & Explanation

$\eta_d = 100 (1 - \bar{y}/d)$, where $d$ is average depth of water penetrated and $\bar{y}$ is average numerical deviation from $d$.
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