The project is in North Georgia, There is plenty of rainfall and the surrounding ground certainly gets wet. However, under the barn, it stays quite dry. The exception is when there is a major rain event and water starts to move through the field. We have plans to set up a swale to catch that rainfall and direct it elsewhere.
Here's the barn...
And here's what happens when we camp there...
As you can see, there is no foundation at the moment, just dirt.