Storm-Water Management Implementation through Modeling and GIS

This paper presents an integration of a lumped parameter hydrologic model (Penn State Runoff Model) with a planning level geographic information system (GIS) in implementing a watershed-wide storm-water management plan. The integration is used to estimate physical input parameters of the model. The model is used to simulate runoff hydrographs for various durations and frequencies and process the hydrographs to create \Ipeak flow presentation\N and \Irelease rate\N tables. These tables provide information to create a watershed \Irelease rate map\N that is a practical tool for implementing a storm-water management plan. It is demonstrated that the Penn State Runoff Model and GIS integration successfully implements the requirements of the Stormwater Management Act of Pennsylvania. An innovative GIS integration approach is presented that employs both the vector and the raster GIS formats to take advantage of the best features of each. Cost effectiveness of GIS integration is discussed and recommendations are made for future research. The proposed approach is illustrated for one small and one large watershed in Pennsylvania.

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