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SFPUC details flood-resilience options for Folsom, Cayuga and Wawona neighborhoods
Summary
The San Francisco Public Utilities Commission held a flood-resilience workshop Feb. 8 to explain how the citys combined sewer system performs during storms and to present candidate projects for three high-risk neighborhoods. Staff outlined trade-offs between conveyance, storage and tunneling and said costs range from tens to hundreds of millions of dollars.
The San Francisco Public Utilities Commission on Feb. 8 held the first in a series of flood-resilience workshops, during which staff explained how the citys combined sewer-collection system works, the standard used for design and a set of candidate projects for neighborhoods that flooded in recent years.
Stephanie Harrison, project manager for flood-related work at the SFPUC, told commissioners the agencys level-of-service goal for stormwater management is a 3-hour storm delivering 1.3 inches of rain (the agencys “5-year storm” metric) and that projects are prioritized to meet that standard in targeted areas. She said substantial stormwater and tide interactions, historic waterways and local topography drive where water concentrates and causes the deepest flooding.
Staff presented three candidate approaches for the frequently flooded Seventeenth & Folsom area: a 17-foot-diameter connector tunnel to a potential channel tunnel (early cost estimate about $260 million, earliest completion…
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