This command updates GeoFluv with information about changes to the valley bottom polylines (or GeoFluv Boundary polyline).
The valley bottom and GeoFluv Boundary 2D polylines are user inputs for fundamental values to the GeoFluv program. They are used to directly calculate valley length, subwatershed area, and drainage density, and affect discharge calculations and channel dimensions. All commands that need to use these input polylines always check the drawing first and use the current version of these polylines in the drawing. The primary use of this command is to quickly update the data displayed on the Setup tab, the Channels tab and the Output tab after a change has been made in the drawing to either the GeoFluv Boundary polyline or any valley bottom polyline.