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SFPUC outlines low-impact development plan, models 400–700 million gallon runoff reduction
Summary
At the May 13 SFPUC meeting, wastewater planner Rosie Jenks presented the commission with a low-impact development strategy that she says could reduce stormwater runoff by roughly 400–700 million gallons per year and proposed short-, mid- and long-term incentives including small grants, flow-factor adjustments and possible impervious-surface fees.
Rosie Jenks, a wastewater planning and regulatory compliance specialist at the San Francisco Public Utilities Commission, told commissioners May 13 that a citywide low-impact development (LID) approach could cut runoff by an estimated 400 to 700 million gallons annually if elements such as eco-roofs, disconnected downspouts and bioretention planters were widely adopted. "We estimated that it would reduce runoff by about 400 to 700,000,000 gallons per year," Jenks said while outlining modeling scenarios.
Jenks described LID as a set of techniques that reintroduce predevelopment hydrology into urban areas through features such as green roofs, pervious paving, vegetated swales, street trees and rain-harvesting. She said federal and local…
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