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Table Of Contents
Chapter 5 Working with Hydrology Commands
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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 Select the Critical Depth Check check box to have a warning message box
display if the flow depth is below the critical depth.
4 In the Flowrate box, type a flow rate for the channel.
5 In the Slope box, type a slope for the channel. You can also click Select to
specify the slope by selecting points on the drawing.
6 In the Mannings n box, type a roughness value for the channel lining material.
You can also click Select to select a coefficient from the Channel - Mannings n
dialog box.
7 In the Flow Depth box, type a flow depth for the channel.
8 In the Height box, type a height for the channel.
9 In the Bottom Width box, type a bottom width for the channel.
10 In the Left Slope box, type a left slope value.
11 In the Right Slope box, type a right slope value. You can also click Select to
specify the slope values by selecting points on the drawing. These values can be
zero.
The box in the top right area of the dialog box displays a graphic of the
currently defined channel. Based on the values you entered, information about
the channel is calculated and displayed below the channel graphic. This
information is for display only and cannot be edited.
NOTE
If the data that you entered has an error, then the channel graphic image
does not display. Check for an error message at the bottom of the dialog
box.
12 Click OK to exit the dialog box.
Calculating Channel Values With User-Defined
Left and Right Radii and Slopes
Use the Advanced Channel Calculator to calculate hydraulic values for channels
with user-defined left and right radii and slopes. You can solve for flowrate,
slope, Mannings n, and depth of flow. The following illustration shows an
advanced channel:
Advanced channel values