This leads to a pdf explaining the basic stuff:
https://electrical.nebraska.gov/sites/electrical.nebraska.gov/files/doc/FREQUENTLY%20ASKED%20FLOOD%20QUESTIONS%202019.pdf

Anything below the high water mark needs to be replaced. There
will be a lot
of really busy people over the next few months.
It seems odd that a homeowner can rewire his principal residence but
has to hire
a pro to wire a weekend home.