Permeable paving and Sustainable Drainage Systems (SuDS)

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Sustainable Drainage Systems (SuDS) are a collection of simple philosophies and techniques which can help to reduce flooding - and Marshalls has an excellent SuDS solution in Priora permeable paving.

Marshalls Priora was launched in 2001 and fast became the UK’s most popular permeable concrete block paving (CBPP) system. In that time Marshalls has become a recognised leader in all aspects of permeable systems.

The documents and videos on this page provide potential customers with a comprehensive suite of information to make the specification, adoption and maintenance of CBPP easy. These assets are a combination of independent academic reports, industry case studies and Marshalls own data.

Discover the Marshalls leading range of SuDS

Manufactured in Britain, Priora is easy to maintain and helps alleviate the pressures and stress associated with potential flooding. 

With flooding an all-too-regular occurrence, many commercial, residential, and infrastructure projects now face ‘water stress.’ This is because impermeable surfaces, like roads, paving, and roofs, intercept and redirect surface water run-off before it naturally infiltrates the ground. 

We created our original concrete block permeable paving (CBPP) system and Priora permeable paving, the UK’s best-selling sustainable drainage solution, to counter this.

Explore our full range of SuDS solutions now to ensure your next construction project can cope with the effects of global warming while maintaining its aesthetic appeal. 

Key specifications and performance metrics of Priora permeable paving

• Made at a site in Britain that exclusively uses clean electricity sourced from renewable sources
• Made with 100% recyclable materials
• Made with alternatives to cement to reduce the carbon impact of the product
• BES 6001: This product is made from responsibly sourced construction materials
• This product is proven to manage surface water and provides hydraulic engineers and landscape architects with the tools they need to reduce flood risks
• Adheres to the framework for Quality Management (BSI ISO 9001)
• Complies with the standard for Environmental Management (BSI ISO 14001)
• Fulfills the standards for Occupational Health & Safety (BSI ISO 45001)

Permeable Paving Design Guide

This detailed and comprehensive document has been developed using Marshalls’ vast experience in researching, promoting and designing the UK’s most popular permeable paving system. It covers all aspects of concrete block permeable paving including hydraulic and structural design, installation and maintenance as well as considering CBPP’s place within a holistic water management scheme.

Video: Designing and Maintaining a Priora Permeable Pavement – Case Study

Martlesham Park & Ride car park, which was installed in 2003, is one of our oldest Priora permeable paving installations. We caught up again with the original designer, Simon Curl of Sussex County Council, to find out how his design is standing the test of time. Watch this video to hear Simon’s approach to common queries such as incorporating tree roots and services – and also to find out about the maintenance regime they’ve employed to keep the surface performing.

Report: When Does Permeable Paving Stop Working?

In spite of years of evidence to the contrary, people still assume that permeable paving will fail because the joints quickly get clogged up. We’ve been revisiting some of our older Priora systems and, using the American Standard method ASTMC1781/C1781M, undertaking in-situ permeability tests to see how they’re working. This report shares our observations along with the results of the tests.

Marshalls references

1. How to Maintain a Permeable Pavement
   Marshalls’ simple advice for maintaining surface permeability in a CBPP system.  
2. Rationalising the Priora sub-base with Prof. John Knapton (2011)
   A synopsis of the work we commissioned from Professor Knapton to redesign the sub-bases beyond the British Standards - saving time, money and carbon.
3. Marshalls Water Quality Research with Coventry University (2014)
   The world’s largest study into water quality within permeable pavements, examining the effect differing sub-base depths has on the quality of discharged water.
4. Marshalls Interlock Testing (2014)
   A report outlining the method devised to compare the surface stiffness of different types of block paving, which also demonstrates the interlock advantage provided by the Priora nib.
5. Marshalls approach to GeoTextiles and water quality within permeable pavements (2011)
   A summary of a research project with Abertay University.
6. Marshalls water quality research with Abertay University (2011)
   The full report from an early study into water quality within permeable pavements.
7. Marshalls Priora system cutaway
   A simple cutaway diagram of a Priora permeable pavement to aid material specification.
8. Marshalls Design Warranty
   An additional warranty that applies to systems that are installed to the design specified by Marshalls Design Team.

Independent references

1. CIRIA SuDS Manual - Chapter 20, Permeable Paving
   A chapter taken from the excellent CIRIA SuDS manual. Thorough and in-depth guidance for the specification, installation and maintenance of CBPP from the Construction Industry Research Information Association.
2. Long Term Infiltration Study - Dr Soenke Borgwardt
   A thorough independent study into the long-term maintenance requirements of CBPP, which demonstrates that the infiltration rate plateaus at an acceptable rate even with no maintenance.
3. Design & Construction of CBPP - Interpave guidance
   Straightforward installation guidance from the independent body for the UK block paving industry.
4. Maintenance of CBPP – Interpave Guidance
   Straightforward maintenance guidance from the independent body for the UK block paving industry.
5. Using SuDS Close to Buildings (Sept 2012) - fact sheet by SusDrain
   A useful document detailing the use of infiltration systems near to the foundations of buildings.
6. Innovation with SuDS & Hard Landscape - Interpave case studies
   Some independent case studies involving CBPP (not just Priora) and other SuDS features.