Written by Chris Goodell, P.E., D. WRE | WEST Consultants
Copyright © RASModel.com. 2008. All rights reserved.
It happens to the best of us. Occasionally, we import GIS cross sections that we accidentally drew in backwards (i.e. right-to-left looking downstream, instead of the required left-to-right). As a result, you can get a criss-cross deal where the correctly drawn and incorrectly drawn cross sections are located (see figure). You can also tell something's wrong when the River Station label is on the right side of the cross section (looking downstream). RAS always places that label on what it thinks is the left side of the cross section.
It's very easy to fix. Simply left-click on the cross section you want to fix and select "Reverse XS Stationing". Of course you could always go back to your GIS application and redraw (or reverse) each cross section, but who wants to do that?