Step-by-Step how to build Ponds with Waterfalls

A waterfall makes a wonderfully natural addition to a pond, and many ponds incorporate one at the construction stage. While it is possible to add a waterfall later, doing so often presents practical challenges. If you have already taken the step of introducing a pond into your garden, it makes sense to fully exploit the potential of moving water — bringing sound, movement and life to the space.

Why Add a Waterfall?

A waterfall handles a far greater volume of water than a simple water feature and can look disappointing if reduced to a mere trickle. To create a convincing cascade, you will need a dedicated “waterfall pump” — typically more powerful than a standard fountain pump.

A waterfall pump must:

• Move a higher volume of water

• Lift water to greater heights

• Push water through a larger bore pipe

For this reason, it should always be selected according to the specific height and width requirements of your waterfall.

As the vertical lift increases, the pump’s flow rate decreases. Without sufficient capacity, your dramatic cascade may become an uninspiring trickle.

A useful rule of thumb is that for a 6-inch-wide waterfall to be properly covered with a natural sheet of water, the pump should deliver approximately 600 gallons per hour at the required height. Always check the manufacturer’s performance chart before purchasing.

Managing Water Loss

One advantage of a waterfall compared to a standalone water feature is the presence of a substantial reservoir — the pond itself. However, this does not mean water loss is insignificant.

Even minor splashing can cause the pond level to drop noticeably over the course of a day. Beyond inconvenience, water loss can lead to:

• Frequent topping up

• Soil subsidence

• Structural movement

• Increased leakage over time

Careful construction is essential to minimise these risks.

Waterfall Construction to Avoid Water Loss

Waterfalls are notorious for causing ponds to lose water through splashing, leaks and evaporation (the latter being unavoidable).

Whether constructed from preformed units or natural stone, the same principles apply.

After excavating both the pond and the waterfall channel, purchase a single piece of pond liner large enough to cover both pond and waterfall without cutting between them. While this may seem extravagant, it ensures that any leaking or splashing water naturally returns to the pond.

Cut stepped levels into the soil to form the waterfall structure and lay the liner over these steps. If building a natural stone cascade, shape shallow depressions to create small holding pools when the waterfall is not running.

Once the liner is in place, a base of sand and cement can be applied. Either preformed cascade units can be set onto this foundation, or natural stone can be embedded into the mortar to create a stepped, informal appearance. Adding a lime-neutralising compound to the mix helps prevent future water quality problems.

Preformed Units

Preformed waterfall sections range from semi-rigid plastic to fibreglass and reconstituted stone. These units interlock and simplify construction.

Although the units themselves will not leak, water can still escape between sections or via splashing. When installed over the same liner that forms the pond, any escaped water should flow safely back into the system.

Natural Stone Waterfalls

For a natural appearance, York stone is particularly suitable. This sandstone forms flat surfaces easily and can be shaped to size.

Stone slabs should be embedded into mortar laid over the waterproof liner. Construction should begin at the bottom and work upwards, ensuring each upper lip overlaps the pool beneath it. This overlapping design encourages water to fall cleanly rather than seep backward.

Do not trim excess liner along the sides until the waterfall has been test-run. Observing the water’s natural path will reveal where splashing or overflow occurs, allowing adjustments to capture stray water. Strategic placement of stones can help guide the flow.

Once satisfied, the liner edges can be trimmed and buried discreetly. As an additional safeguard, a suitable waterproof sealant may be applied to the finished structure.

Fountains

Fountains offer a simpler method of introducing movement to a pond, though they do not suit every setting.

They work best in formal ponds with geometric shapes, where the structured design complements the symmetry of a fountain display. In informal or wildlife-style ponds, fountains can appear artificial and out of place.

Installation is straightforward. Fountain heads attach directly to a pump, and a wide variety of spray patterns and decorative fittings are available. Some models even include integrated lighting, adding a dramatic focal point for evening entertaining.

Choosing the Right Feature

Whether you opt for a waterfall or a fountain, each option has its advantages and limitations. Waterfalls provide natural sound and drama but require careful construction and pump selection. Fountains are easier to install but suit more formal settings.

At the centre of both is a reliable pump — the engine that powers your chosen feature and satisfies our innate attraction to the sound and sight of moving water.