Yeah you can start by not building _more_ in the flood plain.
And if you do, then don't build architecture that is incapable of just accepting the temporarily higher ground water. We know how to basement just make the basement high enough to tower over the flood.
Oh, no cheap ground-level storefront windows? Welp, guess those have to be elevated above sufficiently voluminous drainage channels (the former streets).
replyOr in Florida's case, mandate hurricane ties on timber homes so they can't lift off their slabs.
replyOne of the things that annoys me most about non-engineering mindsets is not looking at problems from a multivariate optimization perspective.
There are problems, and then there are always more variables to be balanced to optimally solve them than people expect.
The critical additional ones, more often than not: time and money.