"A Pondless Waterfall is simply a re-circulating waterfall or stream without the presence of a pond. Pondless waterfalls work by pumping water contained in a large, in-ground reservoir up and through the Waterfall Spillway, allowing the water to flow back down into the reservoir. This simple recirculation system requires very little maintenance, is easy to install, and ideal for families with young children or pets that love to play in water.
Enjoy the beauty and soothing sounds of a pondless waterfall from any location in your yard. Tuck a small waterfall near the front entrance of your home to greet visitors, or delight in a longer waterfall in the backyard where you can incorporate interesting twists and turns.
You can easily add a pond to your waterfall later on, if you decide that you'd like to keep some fish and enjoy a larger variety of aquatic plants."
-Aquascape