Stock watering can also be done less drastically. I have a 1" plastic water line buried below the frost line around the end of the dam. We put 2 anti-seep collars on it. The top end runs into the pond to a filter suspended about 2' below the surface (supposedly, the cleanest water in the pond is below surface plants/plankton and above bottom muck). The bottom of the line ends at a freeze-out hydrant where I water the cattle.