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 tank installation
peace of mind

Complete range of SuDS orientated products, solutions and services

For over 21 years SEL have assisted Architects, Consultants, Engineers and Contractors throughout the UK in overcoming stormwater management problems and as such have developed a complete range of SuDS orientated products, solutions and services to offer experienced and informed advice on legislation and standards.


Sustainable Drainage Products

Developed to overcome engineering problems and improve buildability on site
controflow chamber

Drainage Chambers

Shallow Flow Control Chambers

Specifically designed to manage surface water discharge from shallow SuDS elements including permeable pavements, swales and basins

hydro brake chamber

Drainage Chambers

Vortex Flow Control Chambers

Prefabricated, watertight, structured wall chambers, manufactured to suit project-specific requirements, with a pre-fitted vortex device

orifice chamber

Drainage Chambers

Orifice Flow Control Chambers

Prefabricated, watertight, structured wall chambers, manufactured to suit project-specific requirements, with pre-fitted orifice and filter screen

catchpit chamber

Drainage Chambers

Prefabricated Catchpit Chambers

Purpose-built HDPE pre-fabricated catchpit chambers ideal for stormwater drainage systems designed to separate silt

permavoid diffuser unit

Permeable Pavements

Rainwater Diffuser Units

Rainwater Diffuser units are a recognised method for efficient diffusion of collected rainwater run-off into and out of the voided sub-base aggregate layers

attenuation membrane liner

Drainage Chambers


PP, LLDPE and HDPE membranes which satisfy most requirements available in different roll lengths and width options to minimise wastage and overcome site accessibility issues

product support

Innovative Drainage Solutions & Quality Assured Installation

SEL have 21 years experience in the execution of SuDS installations and can provide a valuable liaison between Client, Engineer and Groundworker. Working closely with all parties SEL can provide peace of mind that the job is done right
welded membrane air testing cqa

Site Installation

Quality Assured Installation

All works carried out under our strict Quality Assurance protocol as part of our ISO9001 accreditation. All our operatives are CSCS certified

drainage design review

Engineering Support

Design Review

Using industry leading software we can undertake catchment analysis, offer advice on drainage layouts, the positioning and sizing of attenuation tanks and criteria for flow restrictions

drainage value engineering

Engineering Support

Value Engineering

Value, quality, maintenance and life expectancy are key factors we use to determine which solutions will best meet the needs of the project. Our recommendations can lead to long-term savings

get in touch

Sel Environmental Ltd

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