Bski, you'll find as many bottom designs as you will ponds, the only differences being that some have more fish-appeal than others. On the bottom of my pond, I had an excavator construct many elongated hills, the tops of which rise to within twelve to eighteen inches of the water surface. Of course, beside each hill is a hole. My huge oversight was not connecting all the holes with large ditches, with the final ditch running into a sump area where the drain is located. I do have one ditch that runs across the pond, and the fish seem to like gathering along that ditch. Also, a thick stand of fairly large willows grew along the periphery of the pond which I cut below the waterline. The fish like that also. I pulled in and staked down about fifteen trees and now realize that ten or so large PVC structures would probably have been better. You are fortunate to have found this site while you can still make changes.
