Allied & ICAR Exam Bank • ALLIED_0391 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Open Channel Flow

Subtopic: Open Channel Flow

Question Statement:

An M1 water surface profile occurs in a mild-slope channel when the actual water depth $y$ satisfies:

Options:

  • (A) $y > y_n > y_c$
  • (B) $y_n > y > y_c$
  • (C) $y_n > y_c > y$
  • (D) $y_c > y_n > y$

Answer Key:

A

Step-by-Step Solution & Explanation

M1 backwater profile occurs behind a dam or weir in a mild slope ($S_0 < S_c$), where water depth exceeds both normal depth and critical depth ($y > y_n > y_c$).
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