I have recently built a new pond. It is 200' by 200' odd shaped and will average about 12-14' in depth. I have what I think is very good soil over the majority of the pond. Tan color clay. I have about 4.5 feet of water, in about two week with the help of some good rains. The first two feet deep is black dirt after that I get a tan color soil. This is holding water very well but I am worried about a section of the pond were the black dirt line dips down to about 5'. When the water line reaches the black dirt is likely to stop riseing and soak into the softer black soil?