Twinstore tanks

Our patented Twinstore attenuation tanks offer greater performance, reduced footprint and lower cost compared to conventional systems like thermoplastic chambers.

Balancing water between pipes

Twinstore works by using a system of lightweight, helically wound galvanised steel pipes in a range of diameters (0.6m to 3.6m) installed within a lined excavation and backfilled. Instead of being sealed, the pipe joints are designed to pass water into the granular fill.

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This balances water freely between the pipes and the backfill contained within an impermeable membrane. Twinstore reduces the overall footprint of the pipe system – a critical factor in many applications – by balancing the void ratio between the tank and the granular fill. The excavation is lined with either an impermeable membrane (GCL or fully welded liner) or a geotextile liner, depending on the site requirements. Water is cleaned as it passes in and out of the tank.

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Key features

Like all Tubosider attenuation tanks, Twinstore can be fabricated to an infinite number of layouts. Every system is designed to meet your exact needs.

  • Loadbearing

    Designed to HA Standard BD12

  • Easy to maintain

    Pre-fitted with access shafts and ladders

  • Installation

    Easy to handle and quick to install

  • Versatile

    0.3m to 3.6m diameter pipes

Typical applications

From superstores to stadiums, our Twinstore system has proved to be the right choice for engineers, specifiers and contractors across the UK.

  • Can be used anywhere where there is a need for attenuation
  • Offers infinite design possibilities, unlike concrete chambers or cellular systems, which are limited by size and shape
  • Available with Trenchcoat polymer secondary lining for more aggressive environments, which offers an additional design life of 50 years
  • Fully recyclable, unlike cells or concrete
  • Reduces footprint, reduces costs

Twinstore can offer all the unique strength and design versatility of steel with built in durability to independent industry standards.

How to guide to backfill installation