Multiple choice

The depth of flow in an alluvial channel is 1.5 m. If critical velocity ratio is 1.1 and Manning’s n is 0.018, the critical velocity of the channel as per Kennedy’s method is

  1. 0.713 m/s

  2. 0.784 m/s

  3. 0.879 m/s

  4. 1.108 m/s
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 $y = 1.5m, n = 0.018\\ \text{Critical velocity as per kennedy's equation}\\ \hspace{1.7cm}V = 0.55 my^{0.64}\\ \hspace{2cm} = 6.55 \times 1.1 \times (1.5)^{0.64}\\ \hspace{2cm} = 0.784 m/s$

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