Go With the Flow: The Philadelphia Water Department’s Green City, Clean Waters plan gushes with possibilities

When Philadelphia received a mandate from the Environmental Protection Agency (EPA) in 1997 to improve its combined sewer system, the initial solution wasn’t so great. The plan called for replacing old pipes, building more tunnels—using manmade constructions to better handle stormwater. Streets would be dug up, improvements would be made mostly underground and waterway restoration

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