I've decided on an area to start my coop and run, however it was once covered in gravel. (It's now half dirt/half gravel) I'm trying to decide between laying a few inches of top soil and sod (wont the hens just kill it anyway?) or sand. I'm reading many mixed opinions on sand in the run. I'd be interested in what others in rainy areas have to say about dirt vs sand. Being new to this I'm not sure if simply covering the gravel is good enough, as in will it just get scratched back to the surface. I'm worried that over time the gravel has migrated pretty deep so removing it could be a beast. The area is 16' x 16'. I want to do this right and provide the healthiest environment possible with what we have to work with. Thanks so much.