On Friday, April 29, 2016 at 8:06:44 AM UTC-4, Fredd Wright wrote:

....snip...

I'm liking the idea of the pavers for the floor and, for containers, i'm thinking what would be ideal would be plastic sealed containers that are a little larger at the bottom than at the top so as to prevent tipping in a flood. Not sure if those will be easy to find, though.

Purchase a bunch of these and fill them enough that you are comfortable
that they won't float. Place them at the bottom of your containers.

http://www.dinobags.com/usr/products...dbag-empty.jpg