Digging Toronto’s CSO Relief Tunnels

Multi-faceted, decades-long project will all but eliminate combined sewer overflows in Toronto

Digging Toronto’s CSO Relief Tunnels

The city of Toronto has nearly completed the first phase of a massive, roughly $2.2 billion project designed to eliminate frequent combined sewer overflows into the Don River, the city’s inner harbor and a local creek that flows into the river.

The centerpiece of the sprawling,...

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