I agree on flood water being dangerous, with all sorts of things in it, which is what put me off the idea of inflatables. I think the scenario I had in mind was flooding came sooner than expected and it was necessary to swim for it. Being out of the water would protect me from debris, any contaminates etc, help fight hypothermia, and I guess if I covered the top it would provide a shelter of sorts.

I think the drain hole could be plugged by cutting a large piece of foam from furniture, wrapping it well in plastic wrap and squeezing it tightly through the drain hole. Some tubs are heavy but, I have seen the fiberglass ones installed and they are just sort of setting there with caulk around them so ripping one out looks simple enough. Maybe quality tubs are better installed. Apartment dwellers don't have lots of storage space. If I had to squeeze a boat in mine I'd have to flip it upside down and disguise it as a coffee table.

I'm not suggesting doing something risky and possibly fatal when all you have to do is wait for rescue but if the waters rising fast and you have to rescue yourself- maybe useful.

I liked the kayak since kayaks are designed to move around ice it should move around debris, (inflatable) but I think the bush raft would be a good option-easy to build and easy on the wallet.