Abstract
Many methods exist to estimate watershed runoff. The Soil Conservation Service (SCS) Curve Number (CN) method is used widely to estimate runoff, water recharge, stream flow, infiltration, soil moisture content, and landfill leachate production from precipitation. The technique usually is evaluated by use of tables and nomograms, requiring extended computational time commitments and the subjective interpretation of graphical output. HER—Hydrologic Evaluation of Runoff, uses a FORTRAN algorithm to express the SCS technique as an interactive computer model. HER features standardized calculation methodology, generates reproducible results, and allows the rapid calculation of runoff estimates. HER is designed to simplify future efforts to: (1) research the sensitivity and accuracy of the method in environmental applications; and (2) investigate future model modifications to estimate runoff from two layer soil systems consisting of a permeable surface layer underlain by an impermeable subsurface layer.
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