Welcome to not even being on the list of "have to make sure the roads are passable." Hopefully, but not necessarily, the floods aren't that common. Don't count on the planners to have thought that was important. (What is important is that they can say "we have X miles of bike path." They don't have to be *usable* bike paths. Even most of the bike advocacy group definitions of "bike friendly" use criteria like "miles of bike paths" and "how much did you spend," instead of factoring in what is actually *useful* or *safe,* and that's a bone of contention among many serious commuters.)
You might find out who's the "highway" person in your town so you can let them know... so they will know somebody cares. It might taek a few calls ("who do I call to tell about a problem with a bike path?" and when they act clueless then say "who would I talk to about a problem with the roads?")