RainSmart® Stormwater Modules

The RainSmart® modular system is suited for subsurface infiltration, retention and detention stormwater applications.

The modules are manufactured using recycled materials and provide a lightweight, structural component to an engineered design. The system is ideally suited for the construction of underground infiltration, retention, detention tanks, grass swale, subsurface interception channels, septic leach drains and lightweight void fillers for roof garden and planter box applications.

The RainSmart system supersedes traditional gravel and pipe-based systems. The system provides a void space ratio of over 95%, compared to 30 – 40% in typical gravel and pipe based systems. Consequently, the RainSmart system offers a smaller footprint for the same storage volume. This provides a significant saving in the amount of excavation, soil transport, imported clean aggregate, thus reducing earthworks related installation costs and causes minimum site disruption.

The modules are available in kit form, making transporting economical and easy to handle. The lightweight and stackable nature of the tank modules ensures installation is quick and easy, eliminating the use of heavy machinery.

The modular design and structural capabilities distribute loads evenly and allow usage in both trafficable and landscaped areas offering a high safety factor. The design also enables the user to create any shape and size of the underground stormwater structure, without disturbing the surrounding site and maximising land use.

RainSmart modules have a unique low flow design to provide total linear access, invaluable for inspection and maintenance purposes. This allows the designer to efficiently control the build up of sediments in the tank and for flushing the system if ever required.

Benefits & Features

  • A robust yet lightweight system that is simple to install without specialised equipment
  • Environmentally friendly
  • Recharges groundwater table through infiltration
  • Mitigation of downstream flooding
  • Removes the need for above ground ponds and tanks that use valuable space and are health and safety risks
  • RainSmart linear access systems offer an economical and low maintenance system
  • Modular structure for design flexibility
  • Heavy load carrying capacity
  • Flat-packed kits for easy transportation
  • Trafficable when installed with ≥ 600mm pavement cover

RainSmart Tank Assembly

Try our interactive 4 plate single tank assembly demonstration.

Use your mouse to navigate the scene, click, drag and zoom around at your own pace. Click on the numbers to further inspect the process.




5 Plate, Single Module

0.715 x 0.4 x 0.44



5 Plate, Double Module

0.715 x 0.4 x 0.86



5 Plate, Triple Module

0.715 x 0.4 x 1.28



5 Plate, Quad Module

0.715 x 0.4 x 1.7



5 Plate, Penta Module

0.715 x 0.4 x 2.12


* Modules required per 1m3 of stormwater storage, considering a 95% void ratio.
4 and 7 plate options available. Please contact Cirtex® technical support team for assistance on selecting the correct configuration for your application.

Featured Video


What are the main applications?

What size are they?

How are they installed?

What are the main benefits?

What depth of cover material is required above a RainSmart tank?

What grade of geotextile is needed for around tanks?

What type of impermeable liner should you use?

How much sand do you need around the outside of the system?

Does Cirtex supply and install RainSmart systems?

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DuraForce AS series geotextiles are manufactured and tested to exact quality standards and rated according to the NZTA F/7 specification for geotextiles. Available in a range of grades depending on the particular engineering application required.

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LIC – Triton Stormwater System

20 Feb 2016

When LIC (Livestock Improvement Centre), a rapidly expanding farmer-owned co-operative and an employer of 2000 staff needed to grow its Head Office Carpark in Newstead Hamilton, there was no option other than to develop the space where the current stormwater pond for the site was situated.

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Queens Park Development – RainSmart® Stormwater System

11 Feb 2016

This innovative RainSmart® design in Hamilton was set up to make full use of the RainSmart linear access system.

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