If you can't put up a permanent roof, at least tarp over the run or at least a portion of the run, make the center higher so the water can drain off to the outside of the run. Drill the perimeter holes on the bottom, large enough that the holes won't get clogged. Slope the ground with more top soil. Let it dry up a bit before putting in the forest material. The forest materials are not very moisture absorbent, it will just rot in standing water. Once you have a dry base, then put down pine shaving or wood chips on top so it won't melt into a mush.Thanks! I did think of drilling some holes in the wood base to let some water drain out so that's on my to do list. The current fence is 1/2 hardware cloth so it should hold all the material from escaping. I would love a roof but cost wise I don't think I can do it any time soon. Which leaves me with an open run. I'm wondering if it will work to put the material over the mud. I can walk on the mud mess without sinking more than an inch or so. So I would think the flooring would do about the same right?
Could I load it down with forest materials thenmmaybe put 2 or 3 inches of pine shavings on top? The birds will stir it anyway right?
I have 1/2 hardware cloth as the run fence, and our chickens still successfully kick the pine shaving to the lawn. I had to put in garden planter edging all around to hold the bedding in. In you situation, a solid ledge may just create a higher pool, so I suggested a screen ledge which is permeable. Try without it see how it goes before doing the work. One step at a time so you can evaluate what works for you.