Abstract
This chapter presents a case study illustrating an application of Geographic Information System (GIS) in developing watershed rainfall runoff simulation models to be used for state-wide watershed storm water management plans mandated by the Stormwater Management Act of Pennsylvania. GIS is used to estimate input parameters for Penn State RunoffModel (PSRM), a watershed rainfall-runoff simulation model. The model is used to simulate runoff hydrographs for various durations and frequencies. Hydrographs are manipulated to create peak .flow presenta tion and release rate tables which are used to develop a watershed stormwater management plan. The use of GIS eliminates the subjectivity ofthemodelerinmanually estimating certain model input parameters. The application is illustrated for the Bull Run watershed, an 8.4 square miles rural catchment, located in Union County, Pennsylvania.
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