Design

• Building an indoor waterfall as a showpiece for a front entrance, or for a soothing effect in your master suite, is a relatively simple process. The design of the waterfall depends on the available wall space in your room. A floor-to-ceiling waterfall makes a statement, while a smaller, self-contained waterfall may be perfect for a tabletop in your dining room or on your screened porch.
  
  

Materials

• Various sizes of river rock, a sheet of Plexiglas, a pump and a basin are the primary materials you will need to build your indoor waterfall. Water-resistant adhesive like liquid nail may be used to attach the rocks to the glass, and to each other. You can find all of the necessary materials at a home-improvement or garden store, or you may order the pump online from various retailers. Build the reservoir for your indoor waterfall with a preformed plastic pond liner or another water-tight container proportional to the size of your waterfall. For example, if your indoor waterfall goes to the ceiling, your reservoir needs to be large enough to contain the Plexiglas, the pump and the amount of water necessary to create the falls. You can use slate, cobblestone or larger river rocks to cover the basin, adding to the overall natural appearance of your waterfall. Place the waterfall within close proximity of an electrical outlet, as your pump will need power.
  
  

Assembly

• Place the reservoir container against the wall for your waterfall and surround it with rocks, slate or cobblestone. Attach the rocks or stones to each other and to the container using liquid nail or another waterproof adhesive. If you are using a clay pot as your reservoir, seal the hole in the bottom securely with plumber's putty. Your reservoir should be completely water-tight. Measure the bottom of the Plexiglas up to the point where the water will rest. Glue the smaller river rock to the Plexiglas, covering one side completely up to the water line, or beyond if you like. Let it set as per the manufacturer's instructions. Place the pump into the reservoir, securing it with rocks. Place the river-rock-covered Plexiglas into the reservoir. Feed the plastic tubing from the pump up the height of the waterfall, so the water comes out at the top. You may want to attach a brace to the wall at the top of the waterfall, covering it with rock if it is visible. The final step is to fill the reservoir with water and turn on the pump.