Tips on raising the coop floor off of a concrete slab to allow thaw-flood waters to pass underneath

[aart]

If you show us some good photos of the structure and it's surrounds from different angles, inside and out, we might be able to make some useful suggestions.

This^^^
Can't help but wonder if the problem could be solved with outside intervention.

Oh, and....Welcome to BYC! @WhitefaceJS
Where in this world are you located?
Climate, and time of year, is almost always a factor.
Please add your general geographical location to your profile.
It's easy to do, and then it's always there!

 

[Tonyroo]

How is moisture and water even getting in the barn?

Instead of addressing the coop modification, maybe figure out a way to keep water and mud out of the barn?