These are the data that GeoFluv™ uses to calculate the drainage density for the entire area within the GeoFluv Boundary. These are not input fields, but real-time displays of the values being used in the GeoFluv™ design for overall project area within the GeoFluv Boundary. GeoFluvTM calculates these values from the GeoFluv Boundary that the user has drawn and the drainage pattern that the user sketched.
Valleys (ft.) This value is the combined straight-line length of all the valleys (in feet in U.S. units), not the sinuous length of the channel, that the user has sketched within the GeoFluv Boundary.
Area (ac.) This value is the area (in acres in U.S. units) within the GeoFluv Boundary.
Drainage Density (ft/ac) This value is the ratio of Valley Length to Reach Area in U.S. units of feet per acre, a convenient unit for this parameter in landform design work.
If the drainage density is within the variance that the user specified in the Design Natural Regrade dockable dialog box's Settings button, Natural Regrade Global Settings, "Target drainage density variance (%)", then the value will be highlighted in green; if the value is outside the user-specified variance it will be highlighted in red. A red warning can mean that the drainage density is too high or too low. If too high, channels can be deleted or shortened, or the area within the GeoFluv Boundary can be increased. If the value is too low, valleys can lengthened, or a tributary channel can be drawn within the GeoFluv Boundary and then added using the Channels tab's Add button, or the area within the GeoFluv Boundary can be decreased.