Multiple choice

A very wide rectangular channel carries a discharge of 8m3/s per m width. The channel has a bed slope of 0.004 and Manning’s roughness coefficient, n = 0.015. At a certain section of the channel, the flow depth is 1 m.

What Gradually Varied Flow profile exists at this section?

  1. M2

  2. M3

  3. S2

  4. S3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

First, calculate normal depth (yn) using Manning's equation and critical depth (yc). Since the bed slope is steep (S0 > Sc) and the actual depth is less than normal depth, the flow profile is S3.

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