Abstract

The City of Detroit has 77 combined sewer overflow (CSO) outfalls within its sewer collection system. The City's National Pollutant Discharge Elimination System (NPDES) permit for these outfalls mandates that the public must be notified of any CSO events. The notification method developed for the City uses a continuous SWMM model for determining the occurrence and time of overflow. These results are submitted to the state agency for compliance with the state regulatory requirements. This notification method was approved by the state as an interim reporting method until an instrumentation project currently under way is completed.

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