San Francisco Outfall: The Champ?

by G. J. Murphy, (F.ASCE), Asst. Vice Pres.; Parsons Brinckerhoff Quade & Douglas, 1625 Van Ness St., San Francisco, CA 94109,
Y. Eisenberg, (M.ASCE), Professional Assoc.; Parsons, Brinckerhoff Quade & Douglas, 1625 Van Ness St., San Francisco, CA 94109,

Serial Information: Civil Engineering—ASCE, 1985, Vol. 55, Issue 12, Pg. 58-61

Document Type: Feature article


The Southwest Ocean Outfall, with an overall length of 23,400 ft and capacity of 450 mgd, will be major element of the Clean Water Program of the City and County of San Francisco. Offshore, the outfall crosses one of the world's major active fault zones, the San Andreas. Construction started in 1981 and is scheduled to be completed by mid-1986. The shoreward 3,000 ft was built from a pile-supported trestle; offshore, the conduit sections were placed using a specially built barge. The most interesting and unusual earthquake provisions (including a joint with provision to accept shortening and elongation), other design provisions, and construction highlights (including the 17 month delay after 26 ft waves incapacitated the barge) are discussed, along with the Clean Water Program, one of whose prime goals is to largely restore San Francisco Bay to her earlier condition (today shrimp and commercial fishing have returned).

Subject Headings: Water quality | Offshore construction | Barges | Municipal water | Urban areas | Geological faults | Scheduling | Piles

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