The GATE Grind

GATE 2019 CE (CE1) – Question 23

Hydraulics · Channel hydraulics: specific energy, critical flow, uniform flow, hydraulic jump · 1 mark · Multiple choice

In a rectangular channel at critical flow, find the ratio of velocity head to flow depth.

  1. 1/2
  2. 2/3
  3. 3/2
  4. 2

Practise this question in The GATE Grind →

Show answer and explanation

Correct answer: (A) 1/2

Explanation

Critical rectangular flow has $V^2/(gy)=1$. Velocity head is therefore $V^2/(2g)=y/2$. Divide by y: **1/2, A**.