Abstract

The Metropolitan Sewer District of Greater Cincinnati (MSDGC, the District) is committed to the elimination of sanitary sewer overflows (SSO) and basement flooding events in their combined and sanitary sewer networks. In meeting this commitment in the Richmond/Orchard study area, the District has completed a Storm Water Removal Program, conducted flow monitoring and hydraulic modeling, and prepared a remedial measures plan to reduce SSO activity and basement flooding complaints. The recommended remedial plan was considered costly. As a result the District undertook to further evaluate area hydraulic and flooding problems with a focus to improve upon the previous studies when it was determined they did not have the benefit of complete and accurate calibration and system geometry data. A hydraulic model, MIKE SWMM, was developed and calibrated using flow monitoring data collected during the study period and verified using historical monitoring data. Model verification included a more complete consideration of flow, volume, stage, and hydraulic conveyance properties throughout the collection system. The study resulted in a combination of system improvements at an estimated cost of approximately one third of the original estimates to reduce SSO and basement flooding occurrences.

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