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home > pervious surfaces

Source control using pervious surfaces

The use of pervious surfaces is one of the primary methods of achieving source control.

The CIRIA report (C582) provides authoritative guidance to enable designers, specifiers and constructors of pervious pavements to adopt a more scientifically based approach to their use as an effective stormwater source control technique. Further information about the report can be found by following this link. Interpave also provide a range of good practice documents that can help with design.  

 Pervious pavements designed in accordance with the good practice should:

• Deal with stormwater in an acceptable manner by helping to maintain run off rates from developments at pre-development (or greenfield) levels.
• Carry the required traffic loads without structural failure occurring.
• Reduce the risk of causing pollution to controlled waters.

 

A recommended design method is proposed in guidance taking into consideration the following criteria:

• Site characteristics. 
• Allowable discharge rates. 
• Groundwater protection. 
• Geological sensitivities. 
• Environmental issues. 
• Type of application. 
• Success/failure criteria. 
• Aesthetic requirements. 
• Maintenance implications

Paving of front gardens

In October 2008 Permitted Development Rights were introduced for householders wishing to pave over their front gardens. Planning permission is not needed if a new driveway uses permeable (or porous) surfacing, which allows water to drain through, such as gravel, permeable concrete block paving or porous asphalt, or if the rainwater is directed to a lawn or border to drain naturally.

If the surface to be covered is more than 5m2, planning permission will be needed for laying traditional, impermeable driveways that do not control rainwater running off onto roads.

This section of the website provides detailed guidance on permeable/pervious surfaces. Other guidance is available at:
Planning portal: http://www.planningportal.gov.uk

Interpave: http://www.paving.org.uk

 

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