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Then, they were dissolved in ArcGIS by watershed to get the watershed boundary. The goal of the Watershed Management Plan (WMP) update was to upgrade the Hillsborough County Stormwater Management Model (HCSWMM) and floodplain mapping for the watersheds throughout the County.The update of the WMP was necessary due to the tremendous amount of development that has occurred throughout the county. The watershed model updates were based on digital topographic data, land use, aerial photography and recent development within each watershed. To find out more how these subbasins were delineated, please contact Hillsborough County Public Works Department, Technical Services Division, Stormwater Services Section, 22th Floor, County Center, 601 E. 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