Attenuation tanks

Registered white Rewatec logo.
Robust solution icon for stormwater attenuation tanks
Simple robust solution

Braced GRP tanks.  
Built to last. 
Above or below ground installations.

Total protection icon for stormwater attenuation tanks
Total protection for peace of mind

Protects against storm surges. 
Protects local properties. 
Safeguards water courses. 

Commercial solution icon for stormwater attenuation tanks
Commercial and municipal solutions

Low maintenance costs. 
Small or large applications. 

Tailored solution icon for stormwater attenuation tanks
Tailored solutions

Designed for your exact requirements. 
Single or multiple tanks. 
Pumped or gravity discharge.

What is an attenuation tank?  

An attenuation tank collects and stores excess surface water run-off from large storm events or heavy rainfall. They are usually used for larger municipal or commercial applications.

The water is released from the attenuation tank at a controlled rate, slowing down the run-off before being released into a local water course such as a river, lake or reservoir. This minimises the risk of localised flooding - an increasing issue in the UK where sporadic torrential rain events are becoming more and more common. 

Example applications

  • areas under threat of stormwater 
  • areas prone to surface water flooding 
  • municipal  
  • commercial 
  • industrial 
  • protection of infrastructure from floodwater  
  • railways 
  • underground car parks 


How does an attenuation tank work?

Stormwater run-off is channelled into drainage infrastructure which diverts into the attenuation tank. The water inside the attenuation tank is released in a controlled manner and is either pumped via a pumping chamber or run-off through a gravity stormwater pipe system. 

Stormwater attenuation tanks work by collecting the excess rainwater and by having a flow-control chamber. This controls the amount and velocity of water being pumped out into the drainage system, reducing the risk of flooding to the local area.  

Pipes can then carry the water to various locations depending upon the needs of the site and installation. 

Installation of rewatec stormwater installation tanks


Attenuation tank maintenance

Protect your investment in your Rewatec attenuation tank by having it regularly inspected by a qualified service professional.

When your service provider visits your property to inspect your system, they should:

  • check for cracks and leaks in the tank
  • clean filters
  • keep and update maintenance records for your system
  • explain any areas of concern and recommend next steps

We stand by our products 

For over 50 years, we have proudly developed sustainable and long-lasting products that make a real difference for our customers, our professional partners, and, above all, our planet.

Our experience in the industry allows us to give you a 20-year warranty for our attenuation tanks.

Rewatec 20 year warranty

Training programmes

At Premier Tech we provide a full range of training programmes to fully meet the requirements of our professional partners. If you require product functionality guidance or a more detailed training course for installations, we can provide a solution to meet your needs.   

Contact us for more information

Free quote

Contact our expert in your area for more information about the range of Rewatec attenuation tanks, additional treatment options, and accessories that are right for you. 

request a quote