The river flow direction is defined by digitizing the river reach in a downstream direction. The software will display a flow directional arrow at the center of the river reach showing the assigned flow direction.
If the river reach is defined in an incorrect direction, either right-click on the river reach and select Reverse River Reach from the context menu or go to Input | River Reaches and then select the Reverse River Reach command.
The Reverse River Reach dialog box will be displayed. This dialog box gives the user the option to renumber the cross-section river stations.