Question Bank • QB_SUB_IDE_0002 MCQ • 1 Mark

Section 5: Irrigation and Drainage Engineering

Soil-Water-Plant Relationship

Subtopic: Consumptive use and evapotranspiration

Question Statement:

The reference crop evapotranspiration ($ET_0$) in the standardized FAO-56 Penman-Monteith equation is defined for an idealized hypothetical grass reference crop having an assumed height of:

Options:

  • (A) 0.12 m with surface resistance of 70 s/m and albedo of 0.23
  • (B) 0.50 m with albedo of 0.10
  • (C) 1.0 m alfalfa crop
  • (D) Zero vegetative height (bare soil)

Answer Key:

A

Step-by-Step Solution & Explanation

FAO-56 standard reference surface is a hypothetical grass reference crop with an assumed height of $0.12\text{ m}$, surface resistance of $70\text{ s/m}$, and albedo of $0.23$.
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