I recently converted a 10'x10' dog kennel into a chicken pen. I bought a prefab coop and put it inside. Fits good enough for my 3 hens. We just had our first gully washer and water is coming into the pen making it very wet and nasty. There is still some dry areas, but I'd like to keep it all dry. I thought it was on a good enough slope, but guess I was wrong. What can I put around the perimeter of the pen to keep the water from flowing in? Would sand bags work? What about boards with dirt pushed up against it? Looking for something not so expensive that a 60+yr old woman can do!