I have a pretty good friend who's dad has recently had apond built on their farm. It holds water but only up to a certain dept that is 5-9 feet below where he would like the level of the lake to be. He has now put pigs in his pond to solve this problem as he was told this would fix it. Will this eventually solve his problem and if so how long do you guys think it will take? It is a very clay filled soil although there are quite a few rocks in it. Feedback?