FE Civil Engineering Exam Prep #1

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

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 (cross sectional area of flow) / P (wetted perimeter)

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