Allows the Volumetric Runoff Coefficient to be calculated from Land Use and Overland Slope.
As options are selected from the drop down lists, the appropriate runoff coefficient is selected.
The runoff coefficient is calculated by looking up the values in table 1 in document Hydraulics-07-F.pdf, authored by the Oregon Department of Transportation Highway Division.
Local guidelines may differ from the calculator values. Where values differ the locally recommended values should be used.