My one house purchased late 90s in Ontario came with notes and required signoff aknowledgement that it was in a designated flood plain. So flood plain awareness should not be new to people. (The home was on a raised pedistal foundation, so flood damage should have been minimal if it occured, and price was right)

Moving out west with huge topology changes meant I always checked flood plain maps before looking at realestate. Some friends of mine called me paranoid and had a good laugh about my efforts...but I think with all the atmospheric rivers and worldvwide flooding recently, they may now understand my madness.