Integrating Ponds and Waterfalls into the Garden Landscape

Naturalistic Waterfalls: Design and Construction

Few gardens have natural waterfalls; some with streams have small rapids—best left undisturbed, especially if water-worn and algae-coated.

Most waterfalls must be constructed with care and sympathy for surroundings. A mere mound of rocks or soil for cascade height isn't aesthetically desirable—a waterfall must flow naturally from adjacent garden and landscape features to be fully effective.

Creating a Suitable Backdrop

The usual integration method: build a rock garden as pool backdrop. Done tastefully, very successful—but must be a true rock garden, not a rock heap with protruding stones. Don't use pool excavation spoil for the mound; subsoil won't support alpines. Structure rocks in layers to mimic natural outcrops; backfill with free-draining growing medium.

If the backdrop isn't a rock garden, pool excavation soil can support a waterfall if contoured to appear growing from the ground, not placed on it. This is hard with soil profiling alone; thoughtful planting to obscure or enhance views is often most effective.

If the waterfall is considered during pool planning and construction, fitting it into the landscape presents no undue difficulty. Significant difficulties arise only when adding to an existing water garden.

Lined Cascades: Flexibility and Naturalism

Pre-formed units are easiest and most secure but inflexible and hard to integrate naturally—heavy planting and rocks are the only disguise. For unobstructed water views or completely natural effect, consider alternatives.

Using a pool liner for a waterfall/cascade gives skilled designers great opportunities—tumbling and splashing effects via structural manipulation. Liner may be concealed with pebbles, but better as waterproof barrier behind rock and gravel arrangements. With care, no visual evidence of liner remains.

Excavation for Lined Waterfalls

Begin adjacent to the pond. If liner alone (perhaps with pebbles and rock edging), dig to final shape with allowance for sand bedding. Excavation must be in compacted soil as far as possible; slippage isn't as critical as with pre-formed units but can ruin the effect. If rocks with liner barrier, dig to accommodate rocks—adjustments possible during installation.

Critical: each drop base must tilt backward. Water cascades in, then by volume overflows to next section. Flat or forward-sloping bases dry out when pump is off.

Edge design creates water movements: uniform edge = continual curtain; pinching water through narrow gaps = violent tumbles. Plain liner rarely looks natural; rocks along drop edge give desired effect and are easier to arrange.

Installing the Liner

Remove sharp objects; spread sand cushion over base and sides (fleece creates lumps/creases). Ideally one liner sheet, but often impractical. Work from pool upward; ensure generous overlap in water flow direction. Awkward corners: bold folds and pleats, not spread irregularities (cause wrinkles). Bury or cover liner edge with stone, but above highest intended water level—otherwise seepage into surrounding soil.

Step-by-Step: Lined Garden Waterfall

1. Excavate waterfall shape, ensuring back of each bowl deeper than front so still water remains when pump is off for pleasing effect.
2. Line carefully with pool liner, generous overlap where needed. Smooth folds large and deliberate—easier to disguise.
3. Trim surplus liner; place rocks to hide edge. Best effect: rocks from same source for consistent colour/strata.