Why Ground Anchors Matter for Underground Tanks
Keeping your tank secure, stable, and compliant – even in the most challenging conditions.
When installing underground stormwater or wastewater tanks, one of the biggest risks isn’t what you can see above ground – it’s what can happen below the surface. One of the most common and serious challenges? Tank uplift due to water pressure in the soil. That’s where ground anchors play a crucial role.
What Are Ground Anchors?
Ground anchors are structural components used to secure underground tanks in place. They are typically installed around or through a concrete collar or slab and connected to the tank body or anti-buoyancy foot. Their primary purpose is to prevent tanks from floating or shifting in high water table areas, during heavy rainfall, or in liquefied soils.
While APD’s tanks often include anti-floatation features such as integrated feet or collars, certain site conditions require additional restraint – especially when tanks are installed in saturated soils, flood-prone zones, or areas with minimal overburden weight.
Why Ground Anchors Are Important
When the groundwater level rises, tanks can become buoyant – especially if they’re empty or partially full. Ground anchors provide a mechanical means of restraint, holding the tank securely in place regardless of external pressure.
Movement or rotation of the tank can lead to pipe misalignment, seal failure, and structural damage to surrounding infrastructure. Ground anchors help maintain the tank’s exact position over time.
In many regions, councils and engineers require verified restraint systems as part of tank installation consent. Ground anchors, when specified correctly, provide the necessary uplift protection to meet these standards.
In areas prone to earthquakes and soil liquefaction, anchors can form part of a larger seismic restraint system, ensuring your tank remains stable even during extreme ground movement.
When Are Ground Anchors Required?
Not every tank installation needs ground anchors. However, they may be required when:
APD’s Support for Anchored Installations
We understand that every site is different. Our team works with engineers, contractors, and specifiers to determine whether ground anchors are required, and if so, what type and configuration will best suit the application. We can also provide anchoring design guidance and support documentation to streamline consent processes.
Secure Your Tank. Protect Your Project.
Ground anchors may be out of sight – but they should never be out of mind. Ensuring your underground tank is properly restrained is critical for its long-term performance, safety, and compliance.
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