I have a 27' x 10' chicken run that is being enclosed in the next week or so. The backyard is an absolute mud pie. It is not deep and squishy but it's muddy. I am wanting to put gravel on the bottom and top it with 3 inches of sand. The backyard sometimes floods a little but not usually in this area. I am learning a lot from the posts here, but need to know what you think of this plan. The coop is 6' x 8' and is set on concrete blocks witch I had planned to cover with sand. I have been reading about poop pans to place under the roost. The chickens will have access to food in the coop, but there is enough room that the water pan and feeder do not need to be under the roost or nests. I have seven chicks about 3 weeks old and they have most of their feathers. I have good friends who raise chickens helping me out, but I would really appreciate some eggspurt advice!