I worked as a intern for the government many years ago. They were doing a study on "ice dams" in Maine. Ice flows down river gets stuck and causes flooding an property damage.

https://en.wikipedia.org/wiki/Ice_jam

they had about 5 options for mitigating with technical solutions (structures in the rivers), a price analysis for each. The last option was to buy the very rurual land that were flooding. It was deemed cheaper. I'm not sure what they ended up doing.