  
    ATTENUATION TANK

  DESIGN & INSTALLATION

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ATTENUATION TANK SERVICES

A stormwater attenuation tank can help reduce, or even eliminate flooding. It is designed to collect and store excess surface water run-off from a large storm event.

We offer a 2 Year Groundworks Warranty for installations for peace of mind.

Managing Stormwater Run-off

Attenuation tanks, manage extreme rainfall in urban areas or in areas where large amounts of non-porous material stops natural water run-off into grass, soil and waterways. The storm water is collected by normal road gullies, or by a permeable surface, and temporarily stored for a period of time. The water is released through a flow control device, or Hydrobrake, that only allows a controlled volume of flow, (eg 3.5 litres per second) through to the mains network, river or reservoir.

With more and more developments in the UK being built on green fields it is important to think about how to deal with the increase in surface water run-off and minimise flood risk, as rainwater will not be able to drain into the ground as the land will be covered with impermeable surfaces like, buildings, roads and car parks.

Custom & Pre-Fabricated Tank Options

Attenuation tanks can be designed and manufactured using a variety of materials to suit your project and built to any size. Large diameter pipe systems, either plastic or steel, Pre-cast concrete box culverts, Concrete tanks and Geo-cellular tanks, commonly known as crates, are a popular choice for engineers and contractors because of their modular nature, enabling them to fit into small spaces with the length, width and depth being designed to suit site specific constraints in terms of space.

They are also suitable for heavy-duty loading with minimal cover, meaning less earth has to be excavated compared to other systems. Their high void ratio, typically 95%+, means that there is also very little space not used for stormwater holding capacity within the excavation, therefore reducing the amount of spoil from the excavation that generally has to be removed from site, which can be costly.

Surface Water Drainage Planning

In most developments, the surface water drainage plan has to be in place right from the start, with the environment agency being responsible for deciding at what rate (in litres per second) the surface water can be released into the water course. Once this rate is confirmed, it is possible for the required storage volume to be calculated. Once the storage volume is known, our designers can work out where on the site the tank can be located, then decide what solution fits best for the specific site needs in terms of loading and size, dictated by the space available.

Smartseptic specialises in attenuation tank design and installation. We are also happy to install pre-fabricated tanks to the required specifications.

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An attenuation tank is a large, buried storage system designed to collect and temporarily hold excess surface water and stormwater during heavy rainfall. It slowly releases this water into the local mains network or watercourse at a controlled rate (often using a Hydrobrake) to prevent flooding.Description text goes here
Depending on the site constraints and load requirements, attenuation tanks can be built using geo-cellular plastic crates (which offer a 95%+ void ratio), large diameter plastic or steel pipes, or pre-cast concrete box culverts. We will recommend the best solution for your specific project.
In most cases, yes. When building on green fields or adding impermeable surfaces like roads and car parks, the Environment Agency requires a surface water drainage plan. Attenuation tanks are often mandatory to manage the increased water run-off and mitigate local flood risks.