Allied & ICAR Exam Bank • ALLIED_0389 MCQ • 1 Mark

Section 4: Soil and Water Conservation Engineering

Open Channel Flow

Subtopic: Open Channel Flow

Question Statement:

The length of a hydraulic jump $L_j$ in a horizontal rectangular channel is approximately:

Options:

  • (A) $5$ to $7$ times the height of the jump ($L_j \approx 5 - 7 H_j$)
  • (B) $1$ to $2$ times the height of the jump
  • (C) $15$ to $20$ times the height of the jump
  • (D) Equal to pre-jump depth $y_1$

Answer Key:

A

Step-by-Step Solution & Explanation

Experimental studies (USBR) indicate the roller length of a classical hydraulic jump is approximately $5(y_2 - y_1)$ to $6.9(y_2 - y_1)$.
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