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Point Place Sanitary Sewer Overflow Elimination — Tested in the Real World

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The Point Place collection system in Toledo, Ohio is a separated area of approximately 1,100 acres. The system included three Sanitary Sewer Overflow (SSO) pump stations that diverted flow from the sanitary sewer to the Ottawa River or Maumee Bay during periods of wet weather. In order to eliminate the SSO discharges, additional transport capacity was constructed to convey higher flow to the wastewater treatment plant. The system was designed and implemented between 2002 and 2005.

In June 2006, soon after construction was complete, portions of the City including Point Place experienced a rainfall event with approximately a 100-year recurrence interval. The system performed as intended, effectively controlled the depth of flow in the system and helped to protect against widespread basement backups. The improvements resulted in the elimination of approximately 55 SSO discharges per year (29 MG) to Maumee and Ottawa Rivers.

As the project was designed and constructed, operational staff tended to be skeptical that the capacities provided in the conveyance system were actually required. The real world experience has been that the high flow rates do indeed occur during significant rain events. This paper is intended to share the operational experience gleaned from approximately four years of real world operation.

Keywords: Climate Change; Measured Wet Weather Flows; Sanitary Sewer Overflow Control; Wet Weather Pumping Systems

Document Type: Research Article


Publication date: 2010-01-01

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