I've always had this dream to one day build an aviary. Well now I have a chance to build one and I want it to be the best I can possibly make it. I love muscovies so that's what will be housed inside. So far the measurments are around 12' long x 7' wide x 6' tall. I want to build a pond inside. I don't want stagnant water so I want the water to cirulate and clean itself. Can I have fish inside? (assumig the ducks don't eat them all?) how do I make a pond the cheapest I can? I was thinking dig it to how I want it to look with a waterfall to help circulate water. And put like a heavyduty tarp type stuff in the bottom with big rocks to surround and hold down the tarp. Then I can put small pebbles in the bottom of the pond which won't be very deep.Maybe a foot or two. I was going to make it all out of metal (by welding and such) to make a zoo like aviary. I was going to make it around a tree but how could I go about doing that? What kind of plants I could put in the aviary to make it beautiful and green but the ducks won't completely ruin and is safe for them? I live in Arizona so the temps get hot in the summer Pond I have two pond designs. Which one would be better? First Design Ok its kind of hard to explain but the vertical line is going to be plywood (in the corner of the aviary) so one corner will be a hill, and then a pump or something to make a waterfall work. Then if I want to drain the entire thing, I can turn the faucet on the other pipe and drain all the water to start fresh. Will this work? What do I need to get so this will work? Second Design OK so this is a rough outline of how I am doing the drainage system. There will be a pipe leading out of the pond and it is angled so that when I need to drain the pond, everything will drain out. I was thinking about using a pvc pipe with a facet thing on the end so that I can stop it and start the drainage whenever I want. And a pond liner for the pond, but how will I attach the two together?