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Introduction to CIRIA's project Source control using pervious surfaces (C582)

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

CIRIA’s recent projects on best practice and design guidance for sustainable drainage systems have identified a number of barriers to the use of source control, including a lack of specific guidance on the design and construction of pervious surfaces.

The Technical Report (C582) from CIRIA Research Project RP637 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.  

 Pervious pavements designed in accordance with the note should:

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

The note explains how designers can ensure that the pervious surface and the construction below can effectively and safely store and transmit water and at the same time reliably support the design traffic loads.

A recommended design method is proposed in the report 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

Source Control Using Constructed Pervious Surfaces Report Synopsis

The following pages provide a synopsis of the C582 Report and provides details on:

• Benefits of constructed pervious surfaces.
• Pervious surface types.
• Hydraulic performance issues.
• Structural performance issues.
• Water quality performance issues.

 

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