PHILADELPHIA (June 1, 2011) – Pennsylvania and the city of Philadelphia have embarked on what environmental officials say is the largest project in the U.S. to reduce stormwater pollution through eco-friendly measures, such as porous asphalt and rooftop gardens.
The state and city, the country's fifth largest with 1.5 million people, signed a "Green City, Clean Waters" plan Wednesday, kicking off a 25-year, $2 billion effort to modify infrastructure to reduce the amount of rainwater tainted with road oil, litter and raw sewage flowing into rivers and streams.
(More on Philadelphia's stormwater program . . . )