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##### Asked by: Yali Behnecke

science physics# What is mean by hydraulic radius?

Last Updated: 26th June, 2020

**Hydraulic radius**is defined as the area of theflow section divided by the wetted perimeter, whereas,

**Hydraulicmean**depth is defined as the area of the flow section dividedby the top water surface width.

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Regarding this, what is a hydraulic radius?

Definition of **hydraulic radius**. : the ratio ofthe cross-sectional area of a channel or pipe in which a fluid isflowing to the wetted perimeter of the conduit.

Secondly, what is the hydraulic radius of a pipe? **Hydraulic radius** is the area of the water prismin a **pipe** or channel divided by the wetted perimeter. Thus,for a round conduit flowing full or half full, the **hydraulicradius** is d/4. **Hydraulic radius** measures the flowefficiency of a **pipe**.

Subsequently, one may also ask, how do you find the hydraulic radius?

From the **hydraulic radius** definition:R_{H} = A/P, where A is the cross sectional area of flowand P is its wetted perimeter. From the diagram it is clear that A= by and P = 2y + b, so the **hydraulic radius** is:R_{H} = by/(2y + b) for an open channel flow through arectangular cross section.

What is hydraulic diameter used for?

The **hydraulic diameter** (aka **hydraulic** mean**diameter**) is **used** for a fluid flowing in a pipe, ductor other conduit of any shape. This **uses** the perimeter andthe area of the conduit to provide the **diameter** of a pipewhich has proportions such that conservation of momentum ismaintained.