Permeable Paving Design Guide www.marshalls.co.uk/watermanagement

Permeable Paving Design Guide

Marshalls is the UK’s leading hard landscaping manufacturer and we have been supplying some of the most prestigious landmarks in the UK with hard landscaping solutions since the 1890s. The Marshalls Brand Manifesto We are all influenced by our environments and the better our environment the better we can be. Marshalls believe that we all need places that make us feel safer, happier and more sociable. Places to be ourselves, where we can live, play, create and grow. That belief drives us to be the best we can be. To design and produce new products which are better than anything else available....

We strive to create a better environment for everyone, and use our expertise and experience to create attractive, safe and sustainable spaces which promote well-being. Marshalls believe that flood alleviation products make an effective contribution to achieving this goal. As we continue to develop the spaces around us, the need to protect our natural environment is stronger than ever before. We recognise that green, open spaces in which we can relax and enjoy our leisure time need to co-exist alongside hard landscaped areas. We constantly work to develop new products and technologies which provide...

Contents What’s the issue? SuDS techniques Marshalls Priora Permeable Paving Marshalls Services Marshalls Priora Product Pages Types of Priora System Designing a Priora System Installing a Priora System Maintenance 52 Adoption 54 Glossary 55 Standard Details Mary Dhonau (OBE) MDA Community Flood Consultants Chair of the Flood Protection Association "Climate change means that incidences of 'extreme weather' are becoming commonplace. Increasingly frequent bouts of heavy rainfall should be anticipated as the norm rather than the exception, and in conjunction with our increased rate of urban development,...

Permeable Paving Design Guide What’s the issue? Many developed areas across the world are now entering a state of 'water stress' – not because there’s less water available, but because we’re mismanaging this essential resource. As we continue to develop over green land, we are fundamentally altering the way rainwater maintains our landscapes. Increased levels of impermeable hard standing areas (such as roads, roofs and paved surfaces) intercept and redirect surface water run-off before it has a chance to infiltrate naturally into the ground. This creates a number of problems, which are likely...

Flooding In the UK, surface water run-off is typically diverted into piped networks. The consequence of this is that when heavy rainstorms create high peak flow rates and high volumes of run-off, the piped networks become overloaded and at risk of creating an external flood. Climate change means that the UK’s weather patterns are changing; we now encounter more frequent bursts of much heavier rainfall than ever before. The increased severity of these events, combined with inadequate piped drainage infrastructure, only serve to compound the levels of flooding now experienced. Pollution In addition...

Permeable Paving Design Guide What’s the Solution? Sustainable Drainage Systems (SuDS) provide an alternative approach to traditional piped systems. They mitigate many of the adverse impacts of storm water run-off on the environment in terms of both volume and pollutants. SuDS SuDS stands for Sustainable Drainage System. Essentially, the term refers to a combination of drainage techniques which deal with surface water run-off in an environmentally friendly way. SuDS provide an alternative approach to traditional piped systems. The SuDS philosophy is known as the SuDS Triangle and addresses three...

SuDS Treatment Train The SuDS treatment train follows a sequence of SuDS measures ensuring potentially contaminated surface water run-off passes through an appropriate series of SuDS measures before being discharged into the receiving watercourse. Precipitation (Natural flow of water) (Natural flow of water) Evapotranspiration Evapotranspiration Source Control Site Control Regional Control Discharge to watercourse or groundwater (Control at Source) (Several sub-catchments) Source Control Regional Control To facilitate control of run-off at (or adjacent to) the source, source control measures...

Permeable Paving Design Guide Legislation is driving SuDS Whilst there is an acceptance that SuDS plays a vital role in creating sustainable landscapes, it is still a relatively new philosophy. As such, there is a need for clear guidance. The Flood and Water Management Act 2010 is a major legislative step towards improving both flood risk management and the way we manage our water resources. The act seeks to define clearer roles, responsibilities and standards for the creation of sustainable drainage systems in line with proposed flood risk management strategies. National St andards fo r sustainab...

Permeable Paving Design Guide Examples of SuDS Techniques Utilising green areas to provide natural filtration is known as 'soft SuDS'. Using man-made materials to achieve the same result is referred to as 'hard SuDS'. The following is a list of soft SuDS techniques, and examples of how we can integrate soft and hard SuDS to achieve a practical and holistic solution. Linear drainage directed to a tree pit Filter strips – wide gently sloping area of grass or dense vegetation that filters storm water run-off from impermeable areas Swales – generally wide shallow grass lines channels intended to...

Linear channel into an attenuation pond Permeable paving Adopting wider use of these features will make a marked difference to our landscapes, improving habitats for wildlife and flora and reducing the risk of flooding. However, we cannot ignore the growing need for hardstanding. People need to drive and park vehicles, ride bikes, and push prams and wheelchairs comfortably and easily. We all enjoy aesthetically appealing public spaces which retain their clean, sleek looks with the Marshalls Beany combined kerb and drainage into a swale minimum of maintenance. Even taking into account the growing...