Hydrographic features included in Philadelphia Hydrology Map. This map was officially adopted by City Council as the official map of Philadelphia Watercourses Designated for Protection on September 13th, 2012. The geographic data depicts watercourses within Philadelphia County as they appear on the map and will not be edited or updated. For up-to-date hydrography see the Hydrolographic_Features_Poly layer under Hydrology.
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