Suga,
I sure hope all your plants don't rot. Of all the types of disasters, flooding has got to be the worst. A town I taught in flooded 17 years ago, and they had to shut down the schools for 2 weeks. (That was when I met my husband!) When the kids came back, all their clothes and books smelled like mold for months. The school was moldy too, and many of us ended up with pneumonia and colds that lasted all winter. To this day, i react strongly to mold.
Local stores and nurseries came out ahead, though. Lots of people spent a lot of money replacing landscaping and furnishings. You may find that your Lowes and HD stores fully restock with all kinds of great plants.
Floods bring in tremendous weed seeds, so people who have never needed weed killer will probably have to resort to using it.
So sorry.