Flooding doesn't normally happen in the spring? April has only been a wet month since we started burning carbon?
I have to agree there. There are other weather trends we can more closely link to climate change, but spring flooding seems to be a very weak one. Perhaps there are year over year total rainfall differences that may help account for something, but the flooding by itself does not seem to stand up. The biggest contributor to spring flooding is heavy snow pack (not just snowfall, but cold winter to keep it building up), and relative quick warming in early spring.
The areas north of Montreal that have flooded in 2017 and this year are not unheard of before. When I was young (60's, 70's), we used to head up north to camp and many years that I passed through these areas they were flooded. The borough of Montreal I am in used to flood 100 years ago, and then they build a dyke and stopped it. There was a big flood in '54, that I wasn't around for but have talked to others who were. The dyke was extended after that, and there has not been flooding here since.