City of PhiladelphiaView metadata for key information about this dataset. Data was developed originally from either USGS and the 2004 Sanborn DEM (digital elevation model) using ArcHydro watershed extraction tools. Major Watersheds are dissolved from subshed boundaries which reflect surface flow in relationship to stormwater inlets and outfalls. See also the related layer Major Watersheds - Regional . For questions about this dataset, contact raymond.pierdomenico@phila.gov . For technical assistance, email maps@phila.gov .ArcGIS FeatureLayerhttps://hub.arcgis.com/datasets/73f97f2c6c634469a81dd7721661b63f_0engPHLmapsPublicMajor Watersheds Phila [Pennsylvania--Philadelphia]Web servicesPennsylvania--PhiladelphiaPennsylvaniaLast Modified: 2015-04-29