Allied & ICAR Exam Bank • ALLIED_0406 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Hydrology and Runoff

Subtopic: Hydrology and Runoff

Question Statement:

In the Rational method for peak runoff estimation, the critical rainfall duration is taken equal to:

Options:

  • (A) Time of concentration ($t_c$) of the watershed
  • (B) Total base duration of the unit hydrograph
  • (C) One day (24 hours)
  • (D) Lag time of the watershed

Answer Key:

A

Step-by-Step Solution & Explanation

Maximum peak runoff occurs when the entire watershed contributes simultaneously, which requires storm duration equal to time of concentration $t_c$.
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