A premade pond and waterfall refers to a precast tub or tank used as an outdoor decorative pond. These ponds differ from other backyard water features because they are made of rigid materials rather than the flexible plastic waterproof liners used in free-form pond designs. Installation of a premade pond and waterfall requires only basic tools and skills that are well within the range of most do-it-yourselfers.
Excavate the location for the pond and waterfall. Remove soil to create an opening approximately 2 inches bigger in each direction than the premade pond.
Dig in any wires necessary for the operation of the pond and waterfall's pump. Bury cables rated for underground use or lay in conduits to hold the electrical cables. These cables usually extend to the home, where they connect the household current to the pond and waterfall.
Place 2 inches of sand in the bottom of the excavation. Sand is considered a "nesting material" in this type of project and is used to fill in voids between the sides and bottom of the excavation and the rigid sides and bottom of the pond.
Set the pond into the excavation. Level the pond in place by placing a 4-foot carpenter's level on a straight board placed across the top of the pond. Shift the sand in the bottom of the excavation to achieve a level configuration.
Hook up electrical cables to the pond's pumps.
Back-fill the sides of the excavation using sand. Pour the sand into the gap between the dirt walls of the excavation and the wall of the pond. Poke a wire into the sand as it's poured into the gap to eliminate air bubbles in the sand.
Fill the pond with water and assemble any additional above-ground features before turning on the pumps. Check any plumping connections for leakage.