unless i have a natural rock spillway like the one in these 2 photos. the pond was about 40 yrs old when we rebuilt it and there was no sign of erosion on this rock so we left it as it was. not a good picture but you can visualize it with both pictures. first one is close up second is looking across pond at it. the cut in the first picture is to the bottom of the rock it was done for depth change and fishing purposes
