I just bought a small farm, and I dug a pond in the best place possible. All of my water drains to this corner of my property, the pond is small probbaly about a 40' circle and about 6' deep. It will fill up with one good rain. It is located in central Texas and it is a very rocky bottom but I picked up all of the big rocks and I've put in 300lbs of bentonite. And it leaks slower but it will still run out. I really wanted to have a small pond for a few fish and also for my goats. Any ideas of a possible inexpensive fix?