It's worth pointing out that the $50 to $75 billion of loss only includes the amount is covered by insurance - since the majority of homeowners do not have flood insurance the real economic loss to the state will be significantly higher.

RMS currently estimates the loss will be $70 to $90 billion.  Moody's estimates $108 billion.  And it's pretty much a given that when the dust settles the final number will be higher than either of those.