The new tunnel has been identified for replacement due to poor condition and to help address odour in the area.
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How are we helping with odour in your neighbourhood
EPCOR is aware of consistent sewer odour issues in several neighbourhoods along the alignment of the Duggan Tunnel, particularly in Steinhauer. This project is part of EPCOR’s Corrosion and Odour Reduction Strategy (CORe). The strategy aims to understand and mitigate sewer odour issues and will result in significantly reduced sewer odour city-wide by 2031. With completion of the new tunnel, we expect the major cause of how odour is formed and pushed out into the communities to be notably diminished.
Why is there odour and how will the project help?
The existing Duggan tunnel serves as both a sanitary and storage tunnel and is just over three kilometers long. This means that sanitary flows are stored in the tunnel during wet weather events.
The existing Duggan tunnel has various shifts in depth along the alignment. When built in the 1960s, crews didn’t have the equipment or technology to easily tunnel through the existing sand layer, so they had to tunnel above it or below it. This variation in depth increases the movement of the sanitary flow (up and down), which increases the amount of odour generated. The new tunnel will flow by gravity (not up and down), which will reduce the amount of odour pushed out into the communities.
How odour develops in the existing Duggan tunnel: