My waterfowl are fenced off from my house and yard area.
We have 5 acres and plenty of room so the poo doesn't get concentrated in one area like if you had too many in a small place, plus waterfowl poo easily gets washed away by a good rain or blast from the hose.
I actually like waterfowl better than chickens now because chickens scratch around the base of plants and scatch mulch and wood chips out of flower beds.
Waterfowl just wiggle their beaks around and are far less destructive
