Lay Out Stones
The trickiest part of the waterfall installation is laying out the stones. The only way to do it is to use trial and error until you get the stones to fit exactly how you want them so that they look nice, hide the pond liner and pump tubing, and also provide the elevation you need to get to the top of the waterfall. Stones of just about any size and shape can be used, and your choice of stones will really determine the style of your waterfall. A mixture of different types of stones and a variety of sizes helps filter the water, make the waterfall more interesting, and will make it appear more natural in the space. If you are using any sort of decorative pre-fabricated waterfall, now would be the time to install that as well.