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Table Of Contents
Chapter 5 Working with Hydrology Commands
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8 In the Major Axis box, type a length for the horizontal (Major) axis.
The box in the top-right area of the dialog box displays a graphic of the
currently defined pipe. Based on the values that you entered, information about
the pipe is calculated and displayed at the bottom left of the dialog box. This
information is for display only and cannot be edited.
NOTE
If the data you entered has an error, the pipe graphic image does not
display. Check for an error message at the bottom of the dialog box.
9 Click OK to exit the dialog box.
Calculating the Flow for Custom Pipes Using the
Hazen-Williams Equations
To calculate flow for custom pipes using the Hazen-Williams equations
1 From the Hydrology menu, choose Pipes ä Hazen-Williams User to display the
Hazen-Williams dialog box.
2 From the Solve For list, select the value you want to calculate. The available
values are: Flowrate, Headloss, Coefficient, Area, Perimeter, and Length.
NOTE
Do not enter the value for which you are solving. For example, if you select
Flowrate in this step, leave the Flowrate text box at 0. After you enter the
other values, the program solves for the Flowrate.
3 In the Flowrate box, type a flow rate for the pipe (unless you are solving for the
flowrate).
4 In the Length box, type a length for the pipe (unless you are solving for the
length).
You can also click Select to specify the length by selecting an object or points
on the drawing. For more information, see Specifying a Length in this
chapter.
5 In the Headloss box, type a value to account for headloss (unless you are solving
for the headloss).
You can also click Select to specify the headloss value by selecting an object or
points on the drawing. For more information, see Specifying a Headloss Value
in this chapter.
6 In the Coefficient box, type a coefficient value for the selected pipe (unless you
are solving for the coefficient).
You can also click Select to display the Hazen-Williams Roughness Coefficients
dialog box and select a coefficient. A description of the pipe and the coefficient
value of the pipe displays in this dialog box. For more information, see
Specifying a Hazen Williams Roughness Coefficient in this chapter.
7 In the Area box, type an area for the pipe (unless you are solving for the area).
8 In the Perimeter box, type a perimeter for the pipe (unless you are solving for
the perimeter).
A graphic of the currently defined pipe is displayed in the box in the top-right
area of the dialog box. Based on the values that you entered, information about