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Berkeley, San Francisco, and Oakland have a proportionally higher stock of older housing than many East Coast and Midwestern cities that were founded and developed much earlier — places such as Philadelphia, New York City, Baltimore, Chicago, Hartford, Conn., Savannah, Ga., and Washington, D.C.

Stormwater from areas around the nine-county Bay Area contribute more toxic pollution to San Francisco, San Pablo and Suisun bays than the rivers carrying agricultural runoff from the Valley.

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Philadelphia’s Green Stormwater Infrastructure

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Many older cities face increasing stormwater management issues. Today’s video was put together by the Philadephia Water Department’s Office of Watersheds and gives a pretty good overview of an integrated approach.

The city is trying to address combined sewer overflows through a combination of traditional infrastructure and “green” infrastructure as the city is continuously rebuilt and repaired over time. The main goal is to prevent so much water from running off all of the impervious surfaces in the first place. More information on the approach is here.