There is a fundamental inaccuracy in the FEMA maps. They are based on the USGS maps and the USGS maps are not intended for enlarging to the point that individual property lines can be accurately portrayed. Local municipalities often have suitably precise maps these days, but the feds won't use them. One size fits all.
I can tell that you know what you're talking about. We have very good models done by our local engineers. FEMA says they'll consider them, but I know that they won't because the science is not an issue here, money is. The pigs want money and they're going to take it from those who they can get away with taking it from.
Simple legal robbery. Isn't it odd that whenever they "discover" that (EUREEKA) that their flood maps have changed, it's always a bunch of properties that have to be added to the flood zone. They never seem to "discover" that a bunch need to be removed.
That's because they're plundering thieves.