Allied & ICAR Exam Bank • ALLIED_0440 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Hydrology and Runoff

Subtopic: Hydrograph Analysis and Watershed Routing

Question Statement:

An Instantaneous Unit Hydrograph (IUH) is defined as a unit hydrograph of:

Options:

  • (A) Infinitesimally small duration ($D \to 0$)
  • (B) Infinite duration ($D \to \infty$)
  • (C) One day duration
  • (D) Duration equal to basin lag

Answer Key:

A

Step-by-Step Solution & Explanation

IUH represents the catchment response to an instantaneous pulse of 1 unit effective rainfall ($D \to 0$), mathematically represented as the derivative of the S-curve.
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