Thanks for all your inputs. I have been busy digging. I received a catalog from pond damn piping in Macon. I am researching their system and would like to talk to some of their references. I think what I may do is repair the spillway where I trenched it to drain the pond and decide later if I want to put in a siphon system. The nice thing about that is it goes through the top of the dam and it is cheaper than metal.

Craig