There are several things to consider, however, before starting to dig your pond. The first thing to consider is how you will clean your pond. This can be done from well water or naturally flowing water. The maximum number of ducks is 100 per acre of water. Excessive numbers of ducks rapidly pollute the water and the edges are quickly destroyed from their dabbling.
Smaller ponds are best if they are cement lined with a drain in the bottom.
Gravel or sand should be spread around the edge of the pond so less mud and mess is produced there. Ducks and geese will eat almost any plant, especially if it is the only vegetation around. There are no drugs approved for geese. Remember that waterfowl consume more water per pound of body weight than chickens or turkeys. So you need to dilute the recommend dosages for chickens or turkeys or you might overmedicate.