When we built our 15X30 run at the end of our (sloped) yard, we did not realize that it would turn into a mudpit during rainy weather, and that's exactly what we have now. The run is so muddy and stinky, that the hens spend the entire day in the yard, and only go into their run to get to the henhouse where they sleep at night. We've thought about several options, one of them being to dig a trench all around the run, and then fill it with gravel, but since our yard has tons of roots and rocks in the ground, this would be a huge project we really don't have time for. As an easier and quicker fix I thought about building a sandbox border around the run, and filling the entire thing with 4-6 inches of course sand. Is there any reason this would not work?