Of all the things, I would think the meters would do the best. Aren't they hermetically sealed units? I have seen one bobbing around in the water after a fireman popped it out and it was dry inside. (the Hurricane Agness flood in Md)
As for flood damage, it really depends on how long something was wet and what was in the water. I guarantee the trip curve of your breakers won't be the same if they get salty water in them. It will probably be the classic FP flat line, essentially a one cent fuse.
