I have just had a 2 acre pond built in the Texas Hill Country. We dammed a wet weather creek and made the dam out of clay we found close by. We thought the bottom of the creek was solid rock. The pond builder got it to where he could not move any more rock with a huge dozer. Upon a 2 inch rain, the pond filled about 5 feet deep. It sayed constant level for about 10 days and then began going down pretty fast -- maybe 4 iches a day. The pond guy is standing by his work and will fix it - he thinks there is a leak in the rock bottom. He thinks a liner is the best option to ensure it will hold. Any thoughts about other options, whether a liner is the way to go and if so, which liner? or any other suggestions? He suggested a product called pond gard. I very much appreciate any help.
