Stormwater attenuation tanks – custom built to last

Don’t be limited by the size or shape of concrete or cellular systems; work with our design team to create a stormwater system that really meets your site brief. We can offer an infinite number of layouts using pipes from 0.3m to 3.6m diameter – with a mimimum design life of 60 years.

There’s no need for fabrication work on site. All our tanks are assembled and factory-fitted with any access shafts, ladders, inlet and outlet connections you need. This means that installation is often just a simple pipe laying exercise and any future maintenance is planned for. We also factory-fit flow regulators, so there’s no need for expensive regulator chambers, significantly reducing the end cost of the project.

Loadbearing

Designed to HA Standard BD12

Easy to maintain

Full access for routine and regulatory inspection and cleaning

Helibore pipe

Fabricated from Helibore pipe, a BBA Certified product

Time-saving installations with easy maintenance access

High quality pre-galvanised coil to BS EN 10143 gives a design life of 60 years minimum

Applications:


  • Flow regulators to restrict discharge to the specified rate

  • Pump chambers to achieve required storage volumes

  • Submersible electric pumps complete with switchgear and control panels

  • Gasketed joints, fully tested and WRc approved to ‘Sewers for Adoption’ standards

  • Trenchcoat Polymer secondary coating (BBA Certified) for a life of 50 years in aggressive environments


We’ve supplied over 3,000 tanks across the UK since 1987, bring true value engineered solutions to hundreds of construction projects.

Steel: The smarter choice

The strength and sustainability of steel provides durability and lifespan advantages for construction projects.
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Value engineering

With consultative problem solving and the versatility of steel, value engineering ensures adaptable, cost-effective solutions.
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Case studies

Discover the full range of real-world implementations and sustainability benefits of ViaCon solutions and expertise.
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Welcome to the ViaCon design toolkit

We have put together a selection of useful tools, calculators, information and downloadable resources to help you find what you need quickly and get the most out of your ViaCon system.
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FAQ about stormwater attenuation tanks

What is a stormwater attenuation tank?

A stormwater attenuation tank is engineered to gather and retain surplus surface water runoff during significant storm events. Subsequently, the water is discharged from the storage tank at a regulated pace, typically through a controlled flow mechanism.



What are the benefits of underground attenuation tanks?

Underground attenuation tanks are indispensable for urban stormwater management, mitigating the effects of heavy rainfall on local communities and the environment. They play a pivotal role in preventing flooding, erosion, and water pollution, while fostering more effective and sustainable water resource management practices.



How do stormwater attenuation tanks work?

During periods of heavy rainfall, stormwater attenuation tanks collect and store excess rainwater runoff from impermeable surfaces such as roofs, roads, and parking lots. The stored water is then slowly released into the drainage system or nearby watercourses through an outlet pipe or controlled release mechanism. This controlled release helps alleviate pressure on downstream drainage systems and reduces the risk of flash flooding.



How to size an underground attenuation tank?

Determining the size of an underground attenuation tank involves considering various factors, such as the site’s location, depth of the drainage system, storm return period, soil type, and infiltration rate. Location plays a crucial role in estimating the average annual rainfall in the area.



How are stormwater attenuation tanks installed?

Installation of our stormwater attenuation tanks is straightforward and typically involves excavating a suitable site, placing the tank components in the excavation, and backfilling around the tank to secure it in place. Our tanks are factory-fitted with any necessary accessories, such as access shafts, ladders, and inlet/outlet connections, to minimize on-site fabrication work and streamline the installation process. Once installed, the tank is connected to the existing drainage system or natural watercourses, and any necessary flow regulators are calibrated to ensure optimal performance.