Pond Boss Forums POND CONSTRUCTION Soil questions Pond Liner or Clay

I don't know if this will help or not but....

The NCRS agent a county over uses this to help keep water in ponds that are dug into sandy soil. I think it might be applicable in your case as well.

He recommended digging down as deep as was safe, all the way around the pond. Then drop a thick sheet of visqueen vertically into the trench, from top to bottom. Carefully back fill the trench. Any place where the visqueed overlapped another sheet, he recommended using roofing mastic to glue them together. Using this method, he eliminated 99% of the water that was escaping out the sides of the ponds thru the porous ground. I'm thinking you could use pond liner in place of the visqueen if enough clay wasn't available.