Snow clumps falling from the tree might be a bit of a nuisance though. (Now I'm just being a fatalist).I thought about doing a slope, we get more rain than anything. If I sloped it I was afraid I would create a indent in the ground (from the water run off) that would possibly get too much water in their run that is under their coop, so I decided to do it flat. The ground is sloped so the water could pool and run. We do get snow, but this is under some big pine trees where, even when it rains, it takes hours for any water to show up under them. So I think its ok to be flat, but we shall see. I hope I am not wrong haha