Serving construction for 21 years

Real Innovation for sustainable water management

Innovative Products

Using our experience to design products to satisfy your needs, to make your job easier

Made in the UK

High quality sustainable water management products designed and manufactured in the UK

Technical Support

We are committed to provide full technical support in line with current legislation & guidance

Attenuation Tanks

SEL can supply and install a wide variety of Stormwater modular plastic attenuation systems for the collection and temporary storage of roof and surface water. We can provide advice storage volumes and the correct product selection for your specific site application. Systems available such as Polypipe Polystorm, Osma Aquacell, Aco Stormbrixx, Triton and many others.

SEL has developed the SEL Source AT range of products to simplify the design and enhance the efficiency of attenuation. These products can standardise construction depths, offer enhanced hydrocarbon treatment and optimise the attenuation potential of individual catchments. They allow shallow and deep installation to enable Engineers to overcome site specific issues in the ground.

Please contact SEL if you would like further information regarding any of the products below

Tel: 01254 589987 Email:

surface water management

Key Benefits

Design review

  • We can help identify the most cost effective design

  • Using industry leading software we can undertake catchment analysis

  • offer advice on drainage layouts, the positioning and sizing of attenuation

  • Provide criteria for flow restrictions


  • SEL can provide a valuable liaison between Engineer, Client, Supplier and Groundworker

  • We can coordinate all aspects of a SuDS installation

  • SEL can ensure designs have buildability and are correctly quantified

  • We will manage deliveries, labour and overcome 'design oversights' that become installation issues

Quality Assured

  • Commitment to CIRIA best practice

  • All works take note of The SuDS Manual guidance

  • Installations carried out under ISO9001 QA

  • We will provide method statements, risk assessments, technical support and Cad details

  • All operatives are CSCS certified


Attenuation Tanks Brochure

Download the current Attenuation Tank brochure here

attenuation tank
attenuation tank

Product Information

In Situ Attenuation Tanks

In situ tanks are ideal for retention, attenuation or infiltration applications when used with a suitable geomembrane or geotextile. Their modular nature allows flexibility of shape - ideal for shallow excavation systems, narrow strips or use in restricted areas. They can be used as part of a SuDS system. The system is suitable beneath asphaltic, block-paved or concrete pavements and for the full range of traffic conditions from domestic driveways to highways.


Prefabricated Tanks

Prefabricated attenuation tanks provide an ideal solution for sites with limited space or smaller developments with lower stormwater storage requirements. The tanks are available in sizes up to 6.5m long x 2.5m wide x 1.2m high which provides 18.5m³ of storage. Smaller tanks can be provided to specific site requirements. All tanks
are provided with integral pipe connection spigots in a range of diameters that suit standard UPVc push-fit drainage.


Prefabricated Liners

Prefabricated attenuation tank encapsulation often referred to as ‘Shoe Box’ liners are ideal for smaller attenuation tanks allowing self installation. Guidance can be provided on the installation. The liners can be manufactured in a variety of membrane types such as PP or LLDPE and sized to suit your project specific requirements. Pipe connections can be also be supplied, and are available in a range of diameters.


Further Information


With over 20 years experience SEL have built a team of fully trained specialist membrane installation engineers, all of who have many years experience installing membrane systems across the UK in all aspects of construction. We offer the reassurance of a single point of contact to all parties involved in the design, supply and installation of attenuation tanks, permeable pavement liners and pond liners. More Details...

get in touch

Sel Environmental Ltd

Canal House, Bonsall Street, Blackburn, BB2 4DD
01254 589987 or