The pond is all new construction. I have has 2 separate containers work on the pond. The high spot was left there for fish structure. Both contractors told me they didn't see any sand anywhere. Both said I had great clay for pond construction. The pond does not get filled from run off. It has to be filled with a pump. The levees completely surround the pond. I got in the ditch today and walked it. There is some water in the ditch. I didn't see anywhere that water running. I think the water in the ditch was from the rain we got 2 days ago.