Hydraulic Radius Area of Section Flow

Wetted Perimeter

Area of Section Flow (m)
Wetted Perimeter (s)

Hydraulic radius is the area of the flow section divided by the wetted perimeter. It is expressed as Rh.

To calculate hydraulic radius you should use the following formula:
Rh = A / P
where:
A = area of section flow
P = wetted perimeter

The hydraulic radius is used in order to determine how much water can flow through the channel.

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