CONTINUOUS SIMULATION OF RUNOFF CONTAMINANT LOADS FOR THE SCHUYLKILL RIVER WATERSHED SOURCE WATER ASSESSMENT PROGRAM

The Schuylkill Runoff Loading Model was developed as part of the Schuylkill River Sourcewater Assessment Program. The Storm Water Management Model (SWMM) was used to estimate quantities of contaminant loadings as a result of rainfall-runoff. Continuous SWMM is used to generate unit area loads for a 10-year simulation period and provides statistical estimates of seasonal and annual watershed loadings. The contributions from each of the sub-watersheds were found for each of the nine contaminant categories modeled. The estimation of runoff loads for the Schuylkill Watershed using SWMM is part of a larger susceptibility analysis for the source water assessments. Identification and prioritization of significant sources of pollutants is valuable, not only to the Source Water Assessment process, but also for the overall watershed management planning efforts.