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SFPUC staff recommend 24‑foot Central Bayside tunnel to reduce sewer discharges and increase resilience
Summary
SFPUC staff told commissioners on March 14 that a 24‑foot diameter tunnel best balances current regulatory limits, future flexibility and seismic reliability for the Central Bayside System Improvement Project; staff will proceed with 35% design and return with further briefings and alignment options.
San Francisco Public Utilities Commission staff recommended on March 14 that the Central Bayside System Improvement Project include a 24‑foot diameter tunnel to address a vulnerable channel force main, reduce combined sewer discharges (CSDs) and provide flexibility for likely future regulatory tightening.
Dan Donahue, the program management technical advisor, said the existing channel force main conveys 70 percent of dry‑weather flow to the Southeast plant, is over 40 years old, has failed in the past and sits in a liquefaction zone. "The 24 foot tunnel ... provides an additional 40,000,000 gallons of storage for the bayside, which is about a 30% increase over the existing storage capacity," Donahue said while reviewing hydraulic and receiving‑water modeling.
Staff modeling…
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