From SFPUC :
Did you know 9.5 billion gallons of rainwater flow through the city’s sewer system and into the Bay and Ocean every year? The City is committed to designing innovative ways to keep that water out of the sewer system – through building green streets, installing permeable pavement, and developing systems to reuse it. Join city staff and design experts for a pedal powered tour of the city’s newest green infrastructure installations. Come learn about the history and future of stormwater in SF!