Hydraulic depth can be defined as the cross-sectional area of flow divided by the top width of surface.

**Hydraulic depth** is a very crucial parameter in calculations dealing with fluid mechanics and flow in open channels.

The formula for computing hydraulic depth is:

R = ^{A} / _{T}

Where:

R = Hydraulic Depth

A = Cross-sectional Area of Flow

T = Top Width or Top Surface Water Width

**For Example:**

Find the hydraulic depth of flow in an open channel where the cross-sectional area is 120 m^{2} and the top width is 12 m.

From the example we can see that the cross-sectional area is 120 m^{2} and the top width is 12 m.

R = ^{120} / _{12}

R = 10

Therefore, the hydraulic depth is 10 m.

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