Case Study: Case Study: Rollgum EPDM Liner and Vertex Aeration System–Mount Tamborine, QLD

Case Study

Rollgum EPDM Liner and Vertex Aeration System–Mount Tamborine, QLD

Rollgum Liner
Vertex Aerator
Challenge

A New Dam and Challenging Site Conditions

The owners of a newly built rural property in Mount Tamborine, Queensland, wanted a reliable, long-lasting residential dam that could stay clean and stable year-round. However, the site’s location came with a unique set of challenges, including high groundwater pressure and a shallow water table.

Engineering assessments revealed hydraulic forces beneath the dam could be significant enough to push the liner upward if left unweighted. To counteract this risk, engineers recommended the entire liner be weighted with rock, creating a stable barrier that would prevent buoyancy issues.

While this design addressed the structural concern, it introduced a new challenge–rock surfaces provide ideal attachment points for filamentous algae. To ensure the water stayed clear and healthy, we needed to create a water movement and oxygenation strategy that could offset this risk.

Solution

Rollgum EPDM Liner and Vertex Aeration System

We supplied a 1mm thick Rollgum EPDM liner and worked with the client’s landscapers and engineers to provide guidance on the installation process.

To manage water quality and circulation, we also supplied a ⅓ horsepower Vertex aeration system with two air stations. The aerator included a sound-reduction kit to maintain peace and quiet on the rural property. The system was designed to:

- Maintain consistent water movement around the rocks and liner

- Encourage "good" bacteria growth on rock surfaces; to compete with any algae growth

- Prevent stagnant zones that promote algae buildup

In addition, we provided Biostim Tablets, a 100% natural probiotic to boost numbers of "good" bacteria in the water to also outcompete algae, and Algae Lift, a peroxide based water treatment for lifting algae from underwater surfaces like rocks if small amounts of algae appeared. This ensured the client could stay ahead of any algae that might colonise the rocks.

Result

Engineered Stability and Sustainable Water Quality

With the Rollgum EPDM liner and engineered rock weighting, the dam now maintains full water retention while resisting hydraulic uplift from below.

The Vertex aeration system ensures the water remains well-oxygenated and in motion, helping to prevent algae growth while supporting a healthy aquatic ecosystem. Combined with thoughtful drainage and runoff control designed by the landscapers, the dam is now equipped for balanced, year-round water quality.

While the rock-lined design is unconventional for this type of project, it demonstrates how custom engineering and smart aeration can overcome complex site conditions. The client now has a structurally sound, aerated dam that complements their property’s natural landscape.

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