Arlene Thompson-Maclaren, a homeowner in Dollard-des-Ormeaux, Montreal's West Island, is rebuilding her basement for the third time in as many years after experiencing flooding due to heavy summer rain. Experts say climate change contributes to more intense storms and heavier downpours, but it's not the only factor - aging infrastructure and urban development also play a role. According to professors at Université de Montréal, École de technologie supérieure, and McGill University, municipal drainage systems were designed for less extreme rainfall events and are struggling to adapt to the changing climate. They emphasize that adapting cities will require a combination of approaches, including upgrading infrastructure and changing how neighbourhoods handle rainwater before it reaches storm sewers.
Written by the local model on 2026-08-21,
using this article's own text rather than the other coverage of the
same event (that is the story summary below).
Why this leaning score
The article presents a neutral discussion of climate change and its impact on flooding, citing expert opinions from both sides (e.g., Berg's attribution of more intense storms to climate change, Martel's emphasis on the need for multiple approaches). However, some subtle framing, such as the use of 'more intense storms' instead of 'climate-related floods', may suggest a slightly sympathetic tone towards mitigation and adaptation strategies that might not be universally applicable. The article also presents a range of perspectives, including those from experts in construction engineering and civil engineering, which suggests an effort to provide balance.
Written under an earlier scoring contract, which gave a paragraph
rather than checkable quotes. Re-analysing this article replaces it.
Leaning score +0.35 for article 6 · logged 2026-07-30
Now her Montreal home's been hit 3 straight years.
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home → hit → ?
What's changed?
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What → change → ?
Experts say climate change is only part of the answer
Wooden studs are exposed where finished walls once stood and construction tools are scattered across the concrete floor as Arlene Thompson-Maclaren works to rebuild her basement.
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Maclaren → say → basement
For nearly 40 years, the homeowner in Dollard-des-Ormeaux, a suburb in Montreal's West Island, never had to worry about flooding.
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homeowner → have → flooding
Today, she’s rebuilding the space for the third time in as many years.
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she → rebuild → years
“It’s three years in a row.
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It → ’ → row
August of 2024. July of 2025 and June of 2026,” she said.
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she → say → 2026
Each time, the cleanup has meant tearing out insulation, drywall and flooring — "completely rip it all out and start again," she said with a bitter smile.
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she → mean → smile
Thompson-Maclaren is one of dozens of residents in Dollard-des-Ormeaux whose homes have flooded during heavy summer rain over the past three years.
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homes → flood → years
Until recently, many say they never experienced flooding and are now asking the same question: What changed?
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What → say → question
One part of the explanation, experts say, is climate change.
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experts → say → explanation
“We do see events now in the Montreal area and around the world that are more intense than they used to be,” said Alexis Berg, a climate science professor at the Université de Montréal.
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Berg → see → Montréal
“That’s a direct consequence of a warmer atmosphere.”
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That → ’ → atmosphere
Jean-Luc Martel, a professor of construction engineering at École de technologie supérieure who studies urban flooding, says a warmer atmosphere holds more moisture, leading to heavier downpours.
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atmosphere → study → downpours
“With respect to climate change, these are now more frequent events,” he said.
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he → say → change
“We should be ready to see these events more and more.”
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We → see → events
But he says heavier rainfall is only one piece of the puzzle.
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rainfall → say → puzzle
Aging infrastructure faces a changing climate
Martel says many municipal drainage systems were never expected to handle the kind of rainfall cities are now experiencing.
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cities → age → rainfall
“The infrastructures were not designed and will never be designed to deal with those extreme rainfall events,” he said.
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he → design → events
Susan Gaskin, a professor of civil engineering at McGill University, agrees.
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Gaskin → agree → University
She also says residents who say nearby development has changed the way water moves through their neighbourhoods are not wrong.
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water → say → neighbourhoods
The more somewhere is built up, the more impermeable surface you have,”
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you → build → surface
she said.
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she → say → ?
More pavement and rooftops mean less water can soak into the ground, sending larger volumes of runoff toward storm sewers.
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water → mean → sewers
However, Gaskin says newer developments are generally designed with systems that temporarily retain some of that runoff before it reaches municipal infrastructure.
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it → say → infrastructure
The bigger challenge, she says, is adapting older neighbourhoods that were built decades ago for a different climate.
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that → say → climate
Experts say adapting cities will require a combination of approaches.
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adapting → say → approaches
Some involve upgrading infrastructure.
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Some → involve → infrastructure
Others focus on changing how neighbourhoods handle rainwater before it reaches storm sewers.
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it → focus → sewers
“It’s not one solution,” Martel said.
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Martel → ’ → ?
“Every single area will have a different solution that will be helping them more than another area in particular.
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that → have → area
Depending on the impact that you have, you need to find the right solution.”
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you → depend → solution
He says homeowners can also reduce future damage by rebuilding flood-prone basements with more resilient materials and limiting expensive finishes in spaces that are likely to flood again.
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that → say → spaces
One approach gaining traction is bringing more nature into urban environments.
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approach → gain → environments
Chaïma Ben, executive director of the Centre d’écologie urbaine, says cities have traditionally been designed to move rainwater away as quickly as possible.
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cities → say → rainwater
“We say bring nature back," she said.
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she → say → nature
"To remove the asphalt, to depave and plant, add more greenery, add areas that can retain the water."
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that → remove → water
Trees, gardens and other green spaces help absorb rainwater while slowing the amount of runoff entering storm sewers during heavy rainfall.
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Trees → help → rainfall
Ben says these nature-based solutions can complement larger infrastructure projects, which often take years and cost millions of dollars to complete.
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which → say → dollars
She also encourages homeowners to prepare their own properties by maintaining backwater valves and gutters, installing sump pumps where appropriate and replacing paved surfaces with greener alternatives whenever possible.
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She → encourage → alternatives
…and 3 more, not listed.
