A look at the future
Record floods show world has changed and N.B. must adapt, scientists say
New Brunswick’s recordbreaking floods are a jarring reminder climate change is bringing a watery future that will wash away old patterns of life and force many to higher ground permanently, say environmental scientists and hydrologists.
“The reality is that people expect the world to be the way it was, but it’s not,” said Louise Comeau, a professor at the University of New Brunswick and member of a national panel on climate change adaptation. When the waters recede, the provincial and federal governments must frankly inform homeowners the future holds more of the same, says hydrologist John Pomeroy, director of the global water futures program at the University of Saskatchewan. “Sometimes people, when they’ve been flooded out, it’s a good time to offer to buy them out and remove the homes from the dangerous location,” Pomeroy said in an interview. New Brunswick is suffering through record flooding, with rising waters forcing the closure of the Trans-Canada Highway between Moncton and Fredericton and many people being forced out of their homes.
“The floods look like they’re getting larger,” said Pomeroy, who is working on a fresh models for mapping future floods, in tandem with a network of university scientists studying the nation’s largest rivers.
The hydrologist says the public needs to understand historical levels of water flow are no longer guides to the future. Sudden temperature flips from frigid April snowstorms to 26 C, as occurred during the spring runoffs in parts of New Brunswick, are a feature of climate change that encourage flooding, he said.
The province’s legislative committee on climate change cited computer models predicting that by 2100, New Brunswick’s mean annual temperature will increase by as much as 5 C, while more intense rain and snow will increase the amount of moisture hitting the ground.
Those trends aren’t the sole causes of river flooding, but higher seasonal temperatures and precipitation increase the risks, says Al Pietroniro, a senior hydrologist with Environment Canada.
“Across the country there’s an acceleration of what we call the water cycle, which means because the atmosphere is warming, we’re seeing increased precipitation,” he said in a telephone interview.
Premier Brian Gallant told a briefing last week that it’s clear the increasing frequency and severity of severe weather events can be traced to climate change, and the government needs to become more proactive. “We have to do everything we can to combat climate change. We have to do everything we can to mitigate versus climate change, we have to do everything we can to raise awareness about climate change,” he said. “We have to do a better job of mapping where there are flood zones, where there will be the potential for flood zones in the future, where there will be erosion, what can be done to protect our coasts and to protect our communities.”