I'm building a KOI pond under my deck. I had some unfinished space, I don't get much sun here, but its the perfect spot for a water feature/pond. It will have a waterfall and be about 2500 gal. I am down 2 feet right now on the dig. The waterfall with start where the blue wheelbarrel is located now (you can see the wheel of it to the far top left of the pic). I haven't acquired my creek rock just yet.