A hydraulic model was developed for the Potomac Interceptor (PI) system to identify whether additional capacity exists for conveyance of future wastewater flow from the growing suburbs of Washington, DC. Detailed meter data analysis was conducted to develop model input parameters to
simulate dry weather and wet weather flows in the PI system. This paper discusses the methodology used to develop and calibrate the model, in addition to the model results for Year 2025. The model results provide valuable information to the PI Users Group (jurisdictions that contribute flow
to the PI system), so that they can plan for future wastewater conveyance needs. The model developed under this project will continue to be used as a regional planning tool to simulate the impacts of future physical infrastructure changes and/or demographic changes on the availability
of capacity within the PI system.
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