Philadelphia & state of Pennsylvania to spend $2 billion on clean stormwater runoff plan.

PHILADELPHIA - 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. Officials with the U.S. Environmental Protection Agency and national environmental groups said the initiative should serve as a blueprint for cities and towns nationwide. The changes are expected to reduce by 5 billion to 8 billion gallons the amount of sewer overflow going into the city's waterways each year, including the Delaware...

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