2.0

Table Of Contents
Calculating Pipe Flow and Other Hydraulic Values Using the Darcy-Weisbach Equations
509
The calculator dialog box displays and the value you selected is displayed in the
Length text box.
Specifying a Darcy-Weisbach Roughness Coefficient
Use the Darcy-Weisbach Friction Factors table to select an appropriate friction
coefficient from a table.
To choose a Darcy-Weisbach friction coefficient from a table
1 In the Darcy-Weisbach dialog box, click the Select button next to the Friction
Factor box to display the Darcy-Weisbach Friction Factors dialog box.
2 Select a coefficient by placing your cursor in the appropriate column and
clicking anywhere in the text box that contains the value you want to use.
Use the navigation buttons on the right side of the dialog box to move through
the list of descriptions and coefficients.
You can add a new friction factor value by using the following guidelines:
n
Click Insert to add a new row above the row you currently have selected.
n
To add data, select an empty text box and type the new description and
coefficient.
3 Click OK to return to the Darcy-Weisbach pipe calculator dialog box.
Calculating the Flow for Rectangular Pipes Using
the Darcy-Weisbach Equations
To calculate the flow for rectangular pipes using the Darcy-Weisbach equations
1 From the Hydrology menu, choose Pipes
ä
Darcy-Weisbach Rectangular 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, Friction Factor, and Width.
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.