Technical information

Using the Hydraulic Structure Calculators | 147
Using the Hydraulic Structure Calculators
In addition to the Hydrology calculators described previously (see page 143),
the Hydrology menu provides calculator-type dialog boxes for analyzing and
designing various hydraulic structures, including the following:
■ Pipes (both pressure and gravity flow)
■ Channel
■ Orifice
■ Weir
■ Riser
■ Culvert
The following illustration shows a Manning’s n gravity pipe calculator. To
solve for the flow rate, enter values in the Slope, Manning’s n, Depth of Flow,
and Diameter boxes.
As with the hydrology calculators, you can enter values as mathematical
equations. For example, if the required diameter is 36 inches and the
required flow percentage in a particular pipe is 75%, then type 36*0.75, and
the value 27.0 is displayed. You can also specify the value in any units and
the value is automatically converted to units that are specified in the settings.
For example, if the settings units are inches, type 2ft, and the value 24 is
displayed. Or, if the settings units are meters, type 2ft, and the value 0.6096
is displayed. The value and units may be separated by a space, but this is not
required.