A plan announced in Philadelphia would allow the city to reabsorb billions of gallons of rainwater. The plan, aimed at preventing the city's sewer system from overflowing, includes adding rain gardens, green roofs, trees and porous pavement throughout the city. "This is the most significant use of green infrastructure I've seen in the country, the largest scale I've seen," said Jon Capacasa, regional director of water protection for the EPA.

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