Allied & ICAR Exam Bank • ALLIED_0400 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Hydrology and Runoff

Subtopic: Hydrology and Runoff

Question Statement:

The $\Phi$-index of a storm represents:

Options:

  • (A) The average infiltration rate above which the rainfall volume equals the total surface runoff volume
  • (B) The initial abstraction of the catchment
  • (C) The maximum infiltration capacity at time $t = 0$
  • (D) The ratio of peak discharge to rainfall duration

Answer Key:

A

Step-by-Step Solution & Explanation

$\Phi$-index is defined as constant infiltration rate during excess rainfall such that $P_{excess} = \text{Runoff}$.
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