The best way would of been clearing 1-2 feet further above the coop, and putting in a waterproof barrier on the outside of the foundation, with gravel outside of that. But something V shaped above will work nicely too.Vehve, thanks, this is the first time I've built anything on a slope like this so I'm definitely learning. You're right. I had a good rain since I got to this point and a lot of water ended up flowing down the side of the hill into the coop. Now I understand all the people who have houses on the sides of hills complaining about water in their basements.