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COMPUTER MODEL ANALYSIS FOR MITIGATION PLANNING OF SANITARY-SEWER OVERFLOWS
Citation:
Lai*, F. COMPUTER MODEL ANALYSIS FOR MITIGATION PLANNING OF SANITARY-SEWER OVERFLOWS. Presented at WEF 2001 Collection Systems Odyssey: Integrating O&M and Wet Weather Solutions, Bellevue, WA, 7/8-11/2001.
Description:
Sanitary sewer overflows (SSOs) are generally difficult to witness or document as they usually occur during rain events when people are indoors or out of sight. To anser where and when an SSO may occur, it is necessary to know the flow conveyance capacity at various parts of the collection system under normal dry-weather and stressed wet-weather conditions. To capture the system response to the dynamic nature of WWF generation and base-flow variations, a systemwide hydraulic evaluation using dynamic models would be advantageous and often necessary for identifying the causes of the SSO problem to allow the development and evaluation of the most cost-effective engineering solutions. A dynamic model takes into consideration travel times and storage routing effects in a pipe network. It calculates backwater and the location and amount of sewer surcharge, an absolute necessity for an accurate assessment of the collection system for any SSO project. This paper will present: (1) an assessment of current publicly available sewer models for SSO analysis and mitigation planning; (2) project components and advanced data gathering and processing for conducting a systemwide modeling analysis and developing an SSO control plan; and (3) a case study that demonstrates the application of a collection system modeling approach to plan for sanitary-sewer system improvements.