As StormTech originates in the USA, the system was initially designed and manufactured to comply with American AASHTO and ASTM standards. The January 2023 Newsletter launched our new Eurocode Modelling Study and explained how StormTech is structurally evaluated to European design standards and used to validate the standard StormTech installation guidance. A copy of this Newsletter and the Eurocode Modelling Study are available on our website.

Now, our new ADS Technical Note TN 6.21EU goes deeper and shows how compliance with the American standards provides both a robust structural design and a consistent high-quality product. It also includes details linking the American standards to the Eurocode approach.

TN 6.21EU is available online.

StormTech Installation design

Standard StormTech installation design is based on HGV traffic loading. The minimum cover depths achieved with StormTech compare favourably to other below-ground SuDS attenuation systems, and result in a number of advantages.

Not only can this result in cost savings with both reduced excavation volume and reduced spoil disposal, there are potential carbon reduction benefits too. A shallower cover depth can also offer a shallower invert, which can provide additional design benefits. Runoff can flow from the tank to the outfall under gravity, without the need for pumping, and a shallower tank can also help avoid high groundwater.

StormTech's impressive structural performance is partly due to the elliptical-shaped chambers forming the embedment stone into structural arches with load bearing columns. The flexible StormTech chambers shed some of the load into the stiffer embedment material surrounding them and it's the stone that transmits the majority of the load - not the chamber.

Full installation guidance

Comprehensive StormTech construction details and installation guidance can be found on our siteASSIST app. To download siteASSIST simply click the panel or photograph the QR code below.