Yes, and if they have a stove or a fridge, or.... Who knows what they have inside their boats? It's the same with the float homes: they're listing too. They're eventually going to break up. They won't take it; the float homes won't. They won't take going dry, because with their structure, they'll eventually break up.
And then, there are people grounding out in their boats. When they're travelling down a river, and they get stuck out there, who knows what can happen?