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Combined Sewer Overflow Relief Project

Posted: December 21, 2016

The Winnipeg sewer system was originally a single pipe system combining all storm drainage, domestic and industrial wastewater in one pipe to the rivers.  Today the single pipe combined system, which serves the older parts of the city, carries all flow during dry weather to sewage treatment plants where it is cleaned and disinfected prior to being discharged to the rivers. During wet weather events however, the combined sewers system cannot handle all of the runoff that enters the system and it creates discharge directly to the rivers.


The City of Winnipeg has been converting the areas with combined sewers to dual pipes which carry the runoff to the river and all sewage to the treatment plants. This is a long term project, but one that is beginning to move through older areas of St. James.


Beginning in January, there will be conversion taking place in the area near Ecole Assiniboine School. These works will take several months. Once that area is converted, the project will expand to other areas of the neighbourhood upstream.  This is an important initiative as it reduces rainfall run-off burdens on our treatment system and eliminates the need to spill sewage into the Assiniboine River


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