WMS:TR-20 Defined Cross Sections

With this routing method a typical cross-section for each reach (outlet) must be defined. This is done using the TR20 Cross Section Data dialog, and is accessed by selecting the Define Cross Section Data button.

Bankfull Elevation

If you enter the bankfull elevation here, it will trigger a warning message in the TR20 output file if less than two cross section data points are below bankfull. Entering the bankfull elevation is optional.

Zero Damage Elevation

This is used with the TR20 flow duration analysis to flag results at this elevation. Entering the zero damage elevation is optional.

Low Ground Elevation

The low ground elevation is the lowest floodplain elevation in a cross-section. The low ground elevation, which is optional, must not be higher than the bankfull elevation.

Flow Units

The flow can be entered in cubic feet per second per square mile (csm) or cubic feet per second (cfs). To select one of these flows, simply select the type of flow you want by selecting the appropriate radio button in the Define Cross Section dialog. If flow is defined in csm, you must define the drainage area of the basin in square miles.

Defining Cross Sections

Once a cross section has been defined in TR20, this cross section can be used in other locations in the TR20 model. A cross-section defined for an earlier outlet can be used later by another outlet simply by selecting the name from the text window or the drop-down box in the TR20 Routing Data dialog.

Related Topics

• TR20 Overview
• Editing TR20 Parameters
• Entering Basin Data
• Reach Length