Hi all, I have got six hens. They have two coops one elevated and one on the ground in an open enclosure of 20m x 20m which also acts as a run. The run is concreted thoughout. Their sand pit is under the elevated coop and their nestboxes are attached to the inside run walls. They have got a covered roosting place, too. I tried using sand, grit, shingles, bark over the last couple of years but the coop always gets swamped up with heavy rain and as I live in Wales (UK) it rains pretty much a lot here. Has anyone got any other ideas what I could use as flooring in the outside run?