The engineering behind the illusion of a flowing water feature
In short: Learn how to construct a pondless waterfall, a landscape feature that provides the movement of falling water without the maintenance of a standing pond. This guide breaks down the structural layers required to create a permanent, recirculating water display.
Landscape designer Jenn Nawada demonstrates how to build a pondless waterfall by creating a hidden basin. The process involves excavating a large area with a specific deep section for a pump vault, then layering landscape fabric and a waterproof rubber membrane. Plastic boxes and a pump vault form the base, which is then filled with river rocks and boulders to create the visible spillway.
A key technical detail is the use of closed-cell black spray foam. This expanding foam is used to fill voids between boulders, ensuring that water is directed specifically over the stones to remain visible. The project concludes by trimming the liner to create a slight dam and finishing the area with mulch and plantings to blend the structure into the yard.
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Sources
- Summary by Intellect · source: How to Build a Pondless Waterfall | Ask This Old House
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