Cantilever - Vertical Prestressed Precast Concrete Retaining Wall

Panels set vertically into a foundation 550m deep & tied in using cradles and reinforcing bars supplied.

Ideal for


R35 Cantilever Vertical - Large Format Precast Wall Panels

Large format precast wall panels positioned vertically or horizontally. A single panel can be manufactured 3m high and up to 10m in length.

Ideal for


Attenuation is the process where the flow of excess stormwater or rainwater is stored on site and slowly released to a drainage system or watercourse to avert and prevent further flooding. Climate change appears to be increasing the frequency of extreme weather events including periods of very high rainfall. Thus the requirement to manage excess rainwater is becoming increasingly important in areas of population where there is a potential risk of flooding and consequent damage to property and businesses.

Attenuation Tanks constructed of precast concrete are designed to collect and temporarily store this excess rainwater and surface water. The stored water inside attenuation tanks (also known as collection or harvesting tanks) is released via a flow-control chamber and either pumped via a pumping chamber or run-off through a gravity stormwater pipe system.


With it’s high strength, durability and low maintenance requirements precast concrete is the ideal material for the construction of large rainwater storage tanks.  The tank can be buried completely below ground minimising the visual impact as well as freeing up the land for other uses (subject to designed load restrictions).


ACP (Concrete) Ltd are a leading precast tanks supplier and manufacturer in the UK and our attenuation tanks are manufactured in controlled factory conditions using Quality Assured concrete. Both precast and prestressed concrete wall panels provide a known performance, unlike traditional in-situ ‘poured’ walls, therefore reducing the need for specialist and costly engineering input. Our tanks are designed to maximise the storage volume for the footprint are required.


At ACP (Concrete) Ltd, we offer two different wall products in a wide range of sizes as we manufacture concrete wall panels to suit almost all requirements.  Our unrivalled experience can help you to make the right choice between prestressed vertical cantilever walls and precast R35 cantilever walls.


The following questions should be considered:

  • What capacity does the precast tank need to contain?
  • Are you looking to have an open or closed storage tank?
  • Where is the location of the underground tank? In some cases, tanks must be a certain distance from watercourse/wastewater treatments as an example.
  • Are there any restrictions imposed by the site ie. Ground conditions, site layout etc



  • Deep Tanks
  • Shallow Tanks & Covered Tanks


Prestressed and Precast Concrete Attenuation Tanks



There are 2 wall systems to choose from for Underground Attenuation Tanks:

Here to help...

If you are unsure about any of these questions or have any further questions, please contact us to discuss your requirements in more detail.


We have the experience and knowledge to help and support you throughout the full process from design, construction and installation to ensure your final solution is fit for purpose.

Our Prestressed and Precast Concrete Design and Installation Service

There are 2 wall systems to choose from for Underground Attenuation Tanks: