There was an interesting story a few months back about how the city of Nashville has a process where they buy homes in flood-prone areas at a "fair market price", then demolish the homes and convert the property to "green space" (preventing new buildings from being constructed). The main idea was that this is cheaper in the long run than the continuing cost of disaster recovery, emergency services, etc. for people in these areas. I don't think Nashville is the only city doing this sort of thing, but it was news to me when I heard about it.

http://www.tennessean.com/story/news/2017/09/08/nashville-ma...