Technical data

Using the Hydrology Calculators

The following illustration shows a Manning’s n gravity pipe

calculator. To solve for the flowrate, you enter values in the Slope,

Manning’s n, Depth of Flow, and Diameter boxes.

You can enter values as mathematical equations. For example, if the

required diameter is 36 inches and the required flow percentage in a

particular channel is 75%, then enter 36*0.75, and the value 27.0 is

displayed. You can also specify the value in any units and the value

will be converted automatically to units that are specified in the

settings. For example, if the units are in inches, enter 2" and the

value 24 will be displayed.

Hydraulic structure calculators in Autodesk Civil Design include:

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Darcy-Weisbach pressure pipe

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Hazen-Williams pressure pipe

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Manning’s n gravity pipe

■

Channel

■

Orifice

■

Weir

■

Riser

■

Culvert

Hydrology calculators in Autodesk Civil Design include:

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Time of Travel

■

Time of Concentration

■

Runoff (Rational, TR-55 graphical and tabular, and TR-20)