One suggestion that I would emphasis is to NOT put in a drain tile system. I had one for a year, it worked great and then would take zero water. They get way too gummed up. I now have a 4 inch sewer pipe that drains to a side hill. Even in the winter I can dump a 5 gallon pail of hot water down to thaw things out and it works awesome. It is also a ton cheaper than digging a drain. It is a ton easier to clean as you just go to the end and scoop up hair, manure, dirt, etc. I wouldn't do it any other way! For a system in the cooler and washrack I have a 12 inch wide gutter that is 6 inches deep on the drain end and zero on the top end. It is 20 feet long and drains very well. Not sure what that makes the pitch.