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Seattle Public Utilities (SPU) has developed a method to quantify unknowns and provide a transparent means for senior management to make decisions on facilities to meet CSO control goals. Risk, defined as the product of likelihood and consequence, is quantified to size facilities to
meet reduction goals. The likelihood function is created using behavioral parameter sets run through a calibrated hydrologic and hydraulic model. These simulations are evaluated using a goodness-of-fit test. The consequence rating, reflecting the City's values, is determined from a subjective
scoring of social, economic, and environmental characteristics of each basin. The likelihood function and consequence rating are used in the Decision Framework to inform a recommended CSO reduction facility sizing. This recommendation provides a numeric goal for reduction and quantifies the
confidence that the volume is accurate to meet the City's CSO control goal of one untreated CSO per year per site.
Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed. WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.