Definitely won't be buying a sedan. I don't live in a flood prone area but I need a car that can survive sudden increase in flood water.
I drive an Altis now and I want a car at least twice or thrice its wading depth.
I guess your best options will be those vehicles mda has suggested. If you want a crossover, the Subaru XV and Forester have proven offroad performance and could take on light flooded areas.