Application of the Cincinnati Hydraulic Model Maintenance Tool to Support Implementation of the Agency's Wet-Weather Improvement Plan

The approximate 42,000-node hydraulic system-wide computer model (SWM) of the wastewater collection system for the Metropolitan Sewer District of Greater Cincinnati (MSDGC) has been developed and applied to provide a variety of agency objectives, the principal being to perform a comprehensive hydraulic capacity assessment as well as to find capital improvements to assure adequate capacity in order to satisfy Consent Decree requirements. As the agency's approximate $2 billion Wet Weather Improvement Plan (WWIP) moves toward implementation, the SWM is being updated so that it reflects current conditions so that it can be applied with confidence and accuracy to the preliminary design of the capital improvement projects. A process was developed to use the agency's System Wide Model Maintenance Tool that identified approximately 12,000 pipe differences between the SWM and the updated, recent GIS collection system data of which approximately 4,000 were determined to be included in the model update.