Not really a "flood", maybe 3/4" deep, but the dampness was basically trapped in there and so mold grew. In the re-do, I ended up skipping the roofing felt and added 3/4" x 1" grooves every couple of feet in the 2x3 sleepers. A couple years later we had a huge series of storms coupled with a sump pump failure resulting in an even worse flood than the first. Thanks to the grooves, I did not have a second redo of the room. I have since sold that house and am currently planning a dedicated room build in the new place.