CSO Planning Model Development and Verification Strategy

by Edward H. Burgess,
Thomas Day,
James T. Smullen,
Larry A. Roesner,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


A model verification technique is described that uses modeled and monitored overflow occurrences defined in terms of the same long-term frequency statistics that are used to evaluate CSO impacts and controls, rather than traditional, single-event model verification approaches. Verification of the model's ability to accurately reproduce a long-term overflow record provides a greater degree of confidence in the model for use in CSO impact characterization and control planning than verification of the model for a set of single-event responses. This verification technique is demonstrated for one of Philadelphia's three drainage districts, using monitoring data for 60 CSO locations collected for the period from May 1994 through April 1995. Overall, excellent agreement between modeled and monitored overflows was obtained, with STORM reporting 8% fewer ovefflows than were monitored (1951 modeled overflows versus 2150 observed).

Subject Headings: Verification | Overflow | Computer models | Combined sewers | Model accuracy | Storm sewers | Statistics

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