Stormwater Flo-Vault®

Modular Tank System


The Flo-Vault®  is a structural lightweight modular tank system used to construct underground water storage for various applications. The modular nature of the system allows for the easy construction of tanks of any volume and can be designed to accommodate specific site conditions.

Coerco modular tank systems use surface and underground infiltration techniques, resulting in clean water that can be re-used or allowed to re-enter the natural water system. Coerco modular tank systems offer a highly efficient option for storm water management in any kind of soil.

Water Quality
Coerco modular tank systems excel when there is a requirement to achieve high water quality, particularly in the effective removal of nutrients and gross pollutants. In addition to the obvious environmental benefits, the sub -surface location of the tank system provides more useable ground area and enhanced aesthetic setting compared to above ground concrete or plastic tanks.

The Modular Advantage
Coerco modular tank system performance supersedes outdated aggregate trenches. The Coerco system provides a void space of over 90% compared to less than 20% in typical aggregate trenches. Consequently, with a smaller footprint the Coerco system achieves the same storage capacity as an aggregate trench. This saves time and money in installation and civil works costs. The lightweight design of Coerco modular tank modules also make installation quicker, safer and cheaper. No sediment build up occurs in the Coerco system, unlike the clogging that is characteristic of aggregate based approaches.

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  • Class leading compressive strength: 40t/m2
  • Efficient design for great transport savings
  • High infiltrate rate
  • Significant savings on assembly time: up to 300m3/day with 4 people
  • Allows for camera inspection and high pressure jetting


  • Infiltration
  • Detention
  • Retension / reuse
  • Light structural fill
  • Landscape Void fill




Dimension (H) 500mm (W) 575mm (L) 575mm | (H) 22.63" (W) 22.64" (L) 22.64"
Ultimate Strength 40 tonnes/SQM (56.9 PSI) *Ultimate strength till failure (not yield)
Gross Volume 0.165m3 (5.838 ft3)
Storage Capacity 157.05 litres (41.49 US Gallons)
Modules Per Volume 6.06 modules per m3 (0.17 modules per cubic ft)
Void Ratio 95%
Material 85% Recycled Polypropylene 15% Propriety Selected Materials
Colour Black
Chemical & Biological Resistance Unaffected by molds, algae, soil-bourne chemical, bacteria and bitumen
Service Temperature -10°C - 70°C (14F° - 158F°)
Approximate Material Lifespan 100 years + with no ultra violet exposure



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