Multiple choice

An existing 300 mm diameter circular sewer is laid at a slope of 1:28 and carries a peak discharge of 1728 m3/d. Use the partial flow diagram shown in the figure below and assume Manning’s n = 0.015. At the peak discharge, the depth of flow and the velocity are, respectively

  1. 45 mm and 0.28 m/s

  2. 120 mm and 0.50 m/s

  3. 150 mm and 0.57 m/s

  4. 300 mm and 0.71 m/s
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C Correct answer

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