Before you start to build outdoor waterfall it is necessary to concentrate on two structures: the pool into which the water falls and the cascading structure which should be made for the waterfall. It is harder to build the cascading structure however there is a way to build it easy and cheap. A rock is needed which many homeowners have in their property or can easily find somewhere. When you manage to build these two structures you should take a pump in order to keep water recirculating from the pond to the top of the outdoor waterfall from where it can plunge back down to the pond.
There are outdoor waterfalls that have different shapes and sizes which can be placed in the focal points for emphasize. When you start thinking over the design it is necessary to achieve a proper height for the waterfall. Usually a landscape designer exploits a slope on the property or in case of level property he erects a berm or so called artificial slope in order to create the area behind the pond. However it requires a huge amount of work and it is also expensive. If you want to build large outdoor waterfall you need to place a flexible liner on the ground between the top of the waterfall and the pond for creating the water channel. After that you should put boulders on the liner in order to make it invisible and preserve it.
 For building a large outdoor waterfall a lot of work and experience are required. However many homeowners don’t have much space that’s why they often give the preference to a smaller waterfall which creates a wonderful soothing sound when water strikes water. As the alternative you can take pre-cast forms of a certain size that imitate stone for making the cascade. These stones are very compact and you can easily install them because of their ability to stack up easily over the edge of the pond. It should be mentioned that they are costly. If you can get natural rocks you can make use of these resources.
Supplies that are necessary for building outdoor waterfalls
You need to take rocks, submersible pump, tubing that runs from pump to top of waterfall, large plastic flower pot (or the like) for house tubing, unflexible pond liner, skills of a carpenter, shovel, sand, garden hose.
The pump, tubing and rigid pond liner necessary for building outdoor waterfalls can be purchased at the major hardware stores.
Try to find 25-30 rocks. You can take different sizes and shapes but you must have a few large and flat rocks. This is a kind if a drywall project that’s why it is beneficial to choose flatter rocks for easier stabilization. Also you can gather some additional smaller stones which can be placed around the edge of the pond (in order to hide the plastic edge) as the element of decoration.
You can buy a pump called a "Little Giant. It is a submersible pump that has a 6' cord. This 120 GPH pump can force out 120 gallons of water per hour which can be useful for a small garden pond. The width of the tubing that is suitable for a particular pump is 1/2 inch. You can take a small, inexpensive rigid plastic pond liner (which is known as a "preformed" liner) that is 2' in diameter and 7" deep.
The sand is necessary for providing so called "adjustable flooring" for the inflexible plastic pond liner. Also you should have carpenter skills that help you get the pond liner to sit level in the hole.
It should be mentioned that before you start digging the outdoor waterfall you should have a certified electrician who can install GFCI (ground fault circuit interrupter) outlet near the place of estimated pond and waterfall in case if you still haven’t got one. If the the cord length of the pump you have chosen is 6', you can locate it within 6' of the outlet. The best waterfall location in your landscaping is to place it near the patio where you can listen to its soothing sounds.
There is also another important factor before you contact electrician. It is necessary to refer the local utility companies in order to find out whether the digging for an outdoor waterfall and pond won’t harm any buried utility lines.
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