According to new data from the Federal Reserve, nearly three-quarters of expected flood damage to American homes is currently uninsured — and Republicans and those who don’t perceive personal harm from climate change are more likely to lack adequate coverage.
The best insurance is a good deterrent, building a good retaining wall will likely help in protecting the home.
Much like making sure that trees near the home aren’t tall enough to land on the home.
Edit: I’m not saying to not get insurance of you have a wall, but having the wall in addition to insurance will make life that much easier.