Hydraulic mean depth or hydraulic radius can be defined as the cross-sectional area of flow divided by wetted perimeter.

** Wetted perimeter** is the perimeter of the cross sectional area that is “wet”.

**Hydraulic mean depth or hydraulic radius**is a very important parameter in flow in open channels and fluid mechanics calculations.

The formula for computing hydraulic mean depth or hydraulic radius is:

R = ^{A} / _{P}

Where:

R = Hydraulic Depth

A = Cross-sectional Area of Flow

P = Wetted Perimeter

**For Example:**

Find the hydraulic mean depth or hydraulic radius of flow in an open channel where the cross-sectional area is 150 m^{2} and the wetted perimeter is 100 m.

From the example we can see that the cross-sectional area is 150 m^{2} and the wetted perimeter is 100 m.

R = ^{150} / _{100}

R = 1.5

Therefore, the hydraulic mean depth or hydraulic radius is 1.5 m.

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