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AWWOA Water Week Conference 2019
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Wednesday, November 13 • 4:00pm - 4:30pm
Session C - National Foundational Document: I/I in New Sanitary Sewers

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I/I is excess storm water and rain water that enters sanitary and storm sewer systems. Negative impacts of I/I include loss of capacity in trunk sewer systems, loss of development-related revenue for municipalities where development freezes exist due to limited sewer system capacity, and reduced infrastructure lifespan. Increased risk of basement flooding from sewer backup, as well as acute operational difficulties associated with wet weather peaking in wastewater systems, and bypasses at pumping stations and wastewater treatment plants, are additional negative impacts of excess I/I.

Re-capturing capacity in existing sewer systems is becoming increasingly important as highly developed urban areas across Canada continue to emphasize infill development. Sewers full of I/I also have less capacity to convey potential increased flows associated with changing frequency and severity of extreme rainfall events anticipated with changing climate conditions.

While it is accepted that I/I exists in older sanitary sewers, flow monitoring data and extensive surveys of development stakeholders indicate that I/I is occurring widely in newly constructed sanitary sewers (as measured in subdivisions) as well. Excess I/I in new systems appears to be related to several factors, including differing municipal- and private-side design as well as construction and inspection standards and practices. Behavioural and jurisdictional issues also appear to be factors influencing the generation of this I/I.


Wednesday November 13, 2019 4:00pm - 4:30pm
Double Tree by Hilton 16615 109th Avenue North West, Edmonton, Alberta,

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