Practice Quiz

Civil Engineering PE

Category - Hydraulics - Open

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The hydraulic radius of a sewer refers to which of the following?
  1. The diameter
  2. Channel perimeter
  3. One-half the diameter
  4. The ratio of the cross-sectional area of flow to the wetted perimeter
Explanation
Answer: D - The hydraulic radius of a sewer refers to the ratio of the cross-sectional area of flow to the wetted perimeter. (The wetted perimeter is the portion of a cross-section’s perimeter that is “wet.”) The equation that describes the hydraulic radius of a channel, Rh, is expressed as follows:

Rh = A / P = (cross sectional area of flow) / (wetted perimeter)
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