PE Civil Engineering Exam Prep

Category - Civil Engineering

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The hydraulic radius of a sewer refers to which of the following?

The diameter
Channel perimeter
One-half the diameter
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, R_h, is expressed as follows:

R_h= A/P = cross sectional area of flow / wetted perimeter

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