Car Park Sustainable Drainage Solutions, Products and Services

SEL Environmental Ltd     Tel: 01254 589987     Email:

Car Park SuDS

SEL car park SuDS solutions apply the principles of Sustainable Drainage and incorporate a series of treatment phases specifically developed to provide the ideal source control solution to meet the robust requirements of LLFA's, current guidelines and legislation relating to SUDS. The main design principle we use is 'Source Control' the cornerstone of good Sustainable Design

Why Source Control?

Source Control is the treatment and controlled release of surfacewater runoff at or very near its source. Source Control is the preferred technique for the implementation of SUDS. Solutions will take account of regional drainage strategies and allow interface with green solutions to manage surface water which have benefits to ecology, local habitat and biodiversity.

Site discharge should be according to the following hierachy:

  1. Discharge into the ground (infiltration);
  2. Controlled discharge to a surface water body/watercourse or the sea;
  3. Controlled discharge to a surface water sewer.

SEL can provide technical assistance to determine the correct way forward for your development whether it be Office, Retail, Warehousing, Industrial, Leisure or a School.

SEL car park SuDS can integrate  with green roofs, blue roofs, detention ponds, swales, permeable paving, rain harvesting, filter trenches, infiltration, voided sub-base attenuation, modular attenuation, refuelling area containment, oil interception and treatment and vehicle washdown areas.

SEL Car Park SuDS solutions can help if you need to:
Overcome a high water table

High water tables and even perched water at shallow depth require specific design and construction measures to avoid issues such as flotation of attenuation structures and often prevents the use of soakaways. Anti-flotation and temporary dewatering measures are invariably very expensive, but our solution can provide the attenuation or infiltration by avoiding groundwater issues.

Avoid pumping stations

SEL recommend shallow attenuation systems which can often avoid the need for pumping, that might otherwise be required with conventional drainage or deep attention tank solutions. Pumped solutions can be costly to install and maintain and considered to be environmentally unsustainable.

Excavate in contaminated soil

Redevelopment of brownfield sites often have issues with ground contamination. The use of shallow attenuation or soakaway structures can very often avoid the need to excavate into contaminated soils that will incur significant abnormal costs in either on-site remediation or off-site disposal, plus the numerous associated environmental and CDM issues. Shallow attenuation can avoid substantial costs and reduce overall construction time.

Excavate in hard rock

Excavation of hard rock is usually expensive and slow. However, our car park suds solution is ideal for use on sites that are underlain by hard rock at shallow depth, as the system can be incorporated into the pavement construction invariably avoiding any expensive additional excavation for the drainage system.

Excavate in unstable soils

If you development is underlain with unstable soils, then a shallow drainage solution is ideal to  avoid expensive shoring and stabilisation works which would be required.

Deal with a difficult site access

In narrow, restricted or otherwise limited access sites, SEL Car Park SuDS can be easily manhandled into place without any heavy lifting or off-loading gear. With void ratios up to 95% for maximum water retention, lightweight cells can be carried and installed by a single construction worker. 

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