I need some major help with our chicken run. I have 8 chickens in a 16x8 foot run that doesn't have a roof, has a little gravel as a substrate, and smells like a mixture of death, poop, and disease (lol). It doesn't smell like that on a regular basis, but today when I was cleaning out the henhouse I decided to "stir" the gravel (which was not successful...as it's the mixed sized gravel and is quite heavy) and WOW I was almost knocked over by the stench that was released. The ground in that area is clay soil, topped with a gravel/sand mixture, topped with our mixed sized gravel. The drainage is terrible, and there's actually a little ditch through the run for rain. How am I supposed to keep it clean?!?! There's poop just sitting on the surface of the gravel, and I don't know what to do about it. I'm considering putting some of that black cloth for weed control on top of the gravel and putting sand on top of that. Is this a good idea? How much sand would I need (in depth and in tons) to maintain a non-stinky run? Do I have to scoop the poop everyday? It's really rainy here and gets disgusting fast... but it's too late to build a roof on the run. HELP!!