Scott, Are you planning on in the aviary when breeding season comes up to have a source of water they can get into? Because I have had call ducks for 2 years now and they were in a pen with a waterer for part of the year and none of the eggs were fertile because they coundnt get in it. I moved them into a pen with a small pond and 90% of the eggs were fertile. And if you are plan on hatching babies and having a water bowl/pond your problem is not fixed there. The water will still be dirty. I personally think it is more cruel to have ducks on ROCKS than wire. JMO.
Ryan
Ryan