How to Build a Koi Fish Pond. Koi and other goldfish can grow very large, sometimes reaching lengths of over ! They're best housed in large ponds with a TON of filtration and weekly water changes. With the right size pond, filter and other.
Pondless Backyard Fountain Pond and Waterfall. Even without the fountain, which in Az will grow algae like nobody's business, I think the idea of softening up the patio with a little rock garden with plants mixed in.
50 Pictures of Backyard Garden Waterfalls (Ideas & Designs)