Northern Liberties is one of three Model Neighborhoods for the Philadelphia Water Department's Green Streets program. This initiative uses "green" tools - street trees, landscaping, vegetative swales (water absorbers), rain barrels, and more - to beautify blocks, increase the energy efficiency of homes, cut down on utility bills, and keep dirty flood waters out of our basements and rivers. More info at http://www.phillywatersheds.org/ and http://www.phillyriverinfo.org/