Jun 11, 2014 · SW, New York. Tractor. David Brown 780 Selectomatic, L3800 Kubota, BX2200 Kubota. Well, LD1 I had a pond built last year. It is 6' deep 130'x90' teardrop shape. The 12" overflow pipe is down the 6' and underground out to a natural creek. The Spillway is to one side and 8" below the top of the overflow tube.