I have my woodlot cross-fenced with electric into 4 seperate wooded “pastures’. I am going to put a watering post about three feet tall with a nipple on it in each woodlot, set in concrete. From the posts to the fenceline will be 30-40 feet. I could string my water piping along 3-4 tall posts to get to the watering point, but that would leave me still hauling water in cold weather SO I am burying the lines.
Here in north Georgia burying the lines 12” deep would avoid any freezing issues, but is that deep enough to be certain the lines didn’t get rooted up by the pigs.