A tributary of the Schuylkill River, the Wissahickon Creek flows through Philadelphia and Montgomery counties in southeastern Pennsylvania. Philadelphia’s water supply plays a prominent part in the history of the Wissahickon Creek. Mills producing paper, grain and wool stood along its banks for much of the 19th century, polluting the creek, until it was realized that the region needed a safe and pure water supply. Most of the mills were torn down and the Fairmount Park Commission purchased land adjacent to the Creek in Philadelphia, creating a green buffer zone. In many areas it retains its natural beauty to this day. However, urban development in Montgomery County and other municipalities have caused major concerns. Impervious cover is a main problem that is causing flooding and other storm water management problems. See how residents enjoy the creek for its natural beauty, and explore the problems and solutions of urbanization as they are examined in this video.