I had a .5 acre pond dug and for the first several times it filled up, it would drain itself completely dry within a few days. Here recently it has been holding water pretty good. It took it about 9 months to get there. It was like it had a 8 inch hole in it when it was first dug. It was all gone in about 7 days. It's had a foot of water in it now for about a month.Could it be that it's gonna hold?