Question

A wide channel is 2 m deep and has certain velocity of flow. An elementary wave is generated due to disturbances and is travelling with a velocity of 5 m/s upstream. What is the velocity of flow? (Flow is subcritical)

• A. 4.42 m/s
• B. 3.0 m/s
• C. 0.57 m/s
• D. 2.0 m/s

Answer 1

The correct option is C 0.57 m/s

Upstream velocity - 5 m/s
$\therefore V+C=5$
But $C=\sqrt{gy}=\sqrt{9.81\times 2}=4.43m/s$
$\therefore V=5-4.43=0.57m/s$