If I am leaking out the bottom, can something like that be fixed by simply lining the bottom with better clay? The soil in this part of iowa is pourous in places and my pond location had some pourous soils (sandstone-rock)that showed up when we did the core samples. They were mostly 2 feet beyond the clay. When the escavation started we found a lot of blue clay that we borrowed for the dam and core trench. I told the contractor that we might as well be safe and just line the bottom with clay also, being that we had plenty available, so that is what he did. We had ten inches of rain in the last two weeks and my pond is about half full. It is not as full as it was after the thaw, so I am assuming I am loosing water through the bottom. Any chance it will seal over time with organic materials?