I am interested in getting into building small, farm type ponds. I recently had a guy call me saying he already had a pond built by another guy but that it won't hold water. Because I am just starting I don't think that is the project to start with but it is a good point and I thought I'd throw out the question. If you build the pond and it just won't hold water then is the next thing to put in a pond liner? Do many people other than Chris have experience troubleshooting ponds?