2.0

Table Of Contents
Calculating Pipe Flow and Other Hydraulic Values Using the Darcy-Weisbach Equations
511
Calculating the Flow for Elliptical Pipes Using the
Darcy-Weisbach Equations
To calculate the flow for elliptical pipes using the Darcy-Weisbach equations
1 From the Hydrology menu, choose Pipes ä Darcy-Weisbach Elliptical to display
the Darcy-Weisbach Calculator dialog box.
2 From the Solve For list, select the value you want to calculate. The available
values are: Flowrate, Length, Headloss, and Friction Factor.
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.
The following illustration shows elliptical pipe values:
Elliptical pipe values
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 Friction Factor box, type a friction factor value for the selected pipe
(unless you are solving for the friction factor).
You can also click Select to display the Darcy-Weisbach Friction Factors dialog
box and select a coefficient. This dialog box describes the pipe and the
coefficient value of the pipe. For more information, see Specifying a Darcy
Weisbach Roughness Coefficient in this chapter.
7 In the Minor Axis box, type a length for the vertical (Minor) axis.