Use a sheepsfoot roller, and lay down clay in 6 to 8 inch layers, and compact it as it is laid down. You need at least two feet of well compacted clay on the bottom to seal it. You will want to make sure it seals. A leaking pond is no fun. I know from experience. We didn't use a roller, only a dozer on the first pond. It's been seven years, and no seal yet. We compacted the second pond bottom with a wheeled backhoe with a bucket full of dirt. It finally sealed, in about a year. A roller would have been much better.

Last edited by John Fitzgerald; 08/28/22 06:31 PM.