We built a pond at my dads old house (and rebuilt it twice), it turned out really nice the last time. It always pumped water out through a watering can that poured into a wash tub that over flowed back in. We also had a fountain in the middle in the last version. I always want to close it in for a few small ducks, that was a no go. But we did see my escaped ringneck pheasant rooster drinking out of it a couple times. We used a 100 gal hard plastic liner (4'x3' diamond) the first 2 times once above ground then in ground, then the last time we pitched it for a rubber liner and built it bigger (8'x4' kidney 3' deep at one end and 2' at the other).