Protecting Edmonton's water supply from climate change uncertainty
By
Brett McKay
In much of Alberta, climate change threatens to make water a scarce resource. But for Edmonton's water supply, the main concerns will come from having too much rather than not enough.
Temperatures and precipitation levels in the Edmonton region are expected to rise because of climate change. The North Saskatchewan River is already seeing increased seasonal fluctuations, and the heightened likelihood of major storms and flooding could affect the security of the city's water treatment plants, both of which are located in a flood plain.
EPCOR's Source Water Protection Plan states that a one-in-100-year flood has the potential to cause significant damage to both the Rossdale and E.L. Smith water treatment plants. Less severe storms, like the 1986 flood that turned city streets into canals, can also cause short-term disruptions.
To protect against these unpredictable events, EPCOR is working to install flood barriers to shield the treatment facilities and move critical infrastructure out of the flood plain.
"In terms of potable water supply, or drinking water supply, there is a flood hardening project that we're doing at both the water treatment plants to create barriers around the plants to protect in times of a one-in-500-year flood, plus a contingency for some greater variability from climate change," said Steph Neufeld, a watershed manager with EPCOR.
Some of this work, such as the relocation of infrastructure to less vulnerable locations, is already underway. Findings from consultations on the flood barriers will be presented to city council in 2023, and EPCOR expects to begin construction in 2024.
The security of Edmonton's water treatment plants affects not just city residents, but the many surrounding communities that are supplied from these same reservoirs. Because there are 28,000 square kilometres of the North Saskatchewan upstream of the Rossdale water treatment plant, researching the impacts of climate change on the river involves several stakeholders between Edmonton and the headwater.