I have an 80 year old home that has a carriage house about 40 feet behind the house. When it rains HEAVY, the water runs down the combined driveway for our house and the neighbors. Most of the rain runs off away from the carriage house, but a GOOD amount soaks down the side of part of the carriage house -- and settles at the wall. Can you recommend a way to keep the water channeled past the house? I'm trying to think of some type of plastic or channel that I can keep the water running down past the house along the wall.