@ai6yr I've worked with FEMA models and they are very aggregate, 1-dimensional hydraulics based on 1-ft increments in the thalweg elevation, which, for really flat areas is not a lot at all. They also don't map the vast majority of streams, just main ones. 0.2% return interval = "1-in-500yr" storm. I wouldn't build there, but it's legal to do so. Listening to the people being interviewed, it sounds like classic NIMBYism. [We can't have more apartments because] "the crime rate is going to go up."