Infiltration questions

LETTER

Re: Preventing overflows of sewage council’s priority, April 19 letter.

Councillor Dunn glosses over one significant aspect of preventing sewage overflows — namely, as she acknowledges, that rainfall enters the sewer system in ways other than from rooftop rainwater. Perhaps she could enlighten us on this — just how much infiltration into the city’s wastewater system comes from interconnections between the two systems and from groundwater that enters into sewer pipes?

G.R. WEBB

Re: Preventing overflows of sewage council’s priority, April 19 letter.

Councillor Dunn glosses over one significant aspect of preventing sewage overflows — namely, as she acknowledges, that rainfall enters the sewer system in ways other than from rooftop rainwater. Perhaps she could enlighten us on this — just how much infiltration into the city’s wastewater system comes from interconnections between the two systems and from groundwater that enters into sewer pipes?

G.R. WEBB

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Amber Dunn - 5 days ago
We are approaching this issue of sewer overflows into rivers from the perspective of where we will get the biggest 'bang for our buck'; from where we can get the greatest reduction of sewer overflows. And we believe it will come from removing the direct inflow of rainwater into our wastewater system.
The council has data showing an instantaneous spike in sewer volumes when it rains ('direct inflow'), and a much smaller and later/slower spike from groundwater infiltration.
The DrainWise Project is also addressing groundwater infiltration through pipe upgrades to the public wastewater system. We will also need to address this same issue on private property.

AMBER DUNN, Councillor

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