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Allows the Volumetric Runoff Coefficient to be calculated from Land Use and Overland Slope

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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.