I am in NE TN. The drainage area is almost 10 acres. After talking with the gubment and reading more, I have decided that I will have an 8" siphon drain even though I probably only need a 6" and I will have an emergency spill way. This will require my contractor to be very careful in measuring as the siphon spillway and dam are all separated by only a foot each. Not a lot of slop to play with. I'm sure he is up to the task though.

Last edited by TN Mike; 12/17/14 08:48 PM.