Permeable Paving

Permeable Paving Products For Sustainable Drainage Systems (SuDS)

Brett Permeable Paving systems offer excellent ‘source control’ by dealing with water run off as close to its source as possible. Water can quickly pass between our blocks and into the sub base below rather than causing significant surface water run off which can lead to flooding. Offering a range of aesthetic options, as well as integration with other Brett Landscaping products, our permeable paving options have the added benefit of providing very space-efficient solutions as well as pollution reduction.

Brett Landscaping have developed PermCalc, a unique software that provides paving professionals with a quick route to designing cost effective permeable pavement solutions for SuDS applications.

This free to use software provides costed design suggestions which can be quickly edited to provide an easy way to work through various 'what if' scenario's when required at the early stages of design.

This is particularly useful for housebuilders and developers when looking at developments of 10 or more new homes which are now subject to building control requirements to incorporate a SuDS solution within the development.

Here combining permeable paving with other materials can provide an attractive, cost effective solution to the issue.

You can access PermCalc by clicking here.


Run Off Control

Conventional pavements, car parks and hardstanding areas are designed to simply shed water from their surface, whereas permeable pavements allow the water to pass between each block and into the underlying sub-base. Here it can be stored, channelled or slowly released in one of three ways - into the ground, passed on to a further stage of SuDS management or passed into the drainage system. But it is the attenuation of water that is important, enabling permeable paving systems to reduce first flush, control peak rates and total volume and frequency of run off by employing the principle of source control.

Permeable paving can also be used to handle run off from surrounding impermeable areas such as roofs and surrounding impermeable areas so long as a factor of approximately 2:1 is maintained, thereby maximising the hydraulic capability of the product.

Pollution Control

The second major benefit of permeable pavements is their ability to reduce pollutants, at or close to the source. Pollutants can be retained on the surface of the pavements (especially where there is little or no fall), before being carried through to the laying course and sub-base layers during a rainfall event, where they can be trapped and degraded over time.

CIRIA*, the leading body in the research for SuDS, states that 60-95% of suspended solids and 70-90% of hydrocarbons can be removed by permeable pavements in this way. This means that not only do they not require oil separators, but are also more efficient at removing a wider range of pollutants than conventional oil separators would be.

*Construction Industry Research and Information Association

Space Efficiency

Pavements created with permeable paving are a very space-efficient solution and ideal for high density housing and construction projects. The removal of the need for oil separators and attenuation tanks results in greater space efficiency and cost savings. The ability to install pavements without the associated underground pipework used in conventional drainage systems, provides additional cost benefits to projects.

A true SuDS scheme must be capable of delivering the following benefits:

  • Control and minimise water quantity
  • Enhance amenity and wildlife
  • Improve water quality

Permeable paving has been proven as one of the most effective ways to achieve these benefits when correctly designed and installed. Our Technical Support team are able to support most SuDS designs. Please contact us on 0345 60 80 579 or contact to discuss further.