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PUC staff lays out low-impact development plan to reduce stormwater loads and augment sewers
Summary
Wastewater staff presented a Sewer System Master Plan approach that uses low-impact development (LID) — bioswales, cisterns, eco-roofs and other green infrastructure — to reduce local sewer flows; early demos show 15–30% local reductions, but citywide impacts are still being modeled and funding/maintenance issues remain.
Arlene Navarette, regulatory manager for the Wastewater Enterprise, presented the San Francisco PUC’s approach to integrating low-impact development (LID) into the Sewer System Master Plan, describing LID as green infrastructure that captures and treats surface flows upstream of combined sewers.
Navarette said LID — also called best management practices or green infrastructure — can intercept runoff, reduce the volume of combined sewer discharges and provide local environmental benefits. She described demonstration projects such as a Sunset Circle parking-lot retrofit that uses swales, native vegetation and an infiltration basin to collect most…
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