Daniel,
Khaki Campbells can fly some, so make sure the fence is 6' high or more. My KCs have never flown out, but I had a pair of East Indies ducks who did! I saw them a year later still living together as a pair, happily swimming in a coastal estuary less than a half mile from my home!
You definitely can use the "I dug a pond and wild/feral ducks got attracted to it. Now they refuse to leave" ploy.
You know the old "Field of Dreams" line ... "If you build it, they will come." Who's to say that wasn't about building a pond, and ducks coming to swim in it.
Khaki Campbells can fly some, so make sure the fence is 6' high or more. My KCs have never flown out, but I had a pair of East Indies ducks who did! I saw them a year later still living together as a pair, happily swimming in a coastal estuary less than a half mile from my home!
You definitely can use the "I dug a pond and wild/feral ducks got attracted to it. Now they refuse to leave" ploy.

