Permeable Paving
Key Benefits
- Water Management: Reduces surface water runoff; Provides water quality treatment through filtration; Can enable groundwater recharge where suitable.
- Environmental: Reduces urban heat island effect compared to standard paving; Can support urban greening when combined with grass/planting.
- Infrastructure: Multi-functional surfaces combining drainage and load-bearing capacity; Reduced need for traditional drainage infrastructure.
Technical Guidance
Site Assessment
Assess ground conditions, infiltration rates, groundwater levels, and contamination risks. Consider traffic loads and frequency. Check for utilities and required access.
Design Considerations
Select appropriate system type based on use (e.g., block paving for parking, reinforced grass for occasional use). Design adequate sub-base depth for storage. Include edge restraints. Consider maintenance access.
Construction
Follow manufacturer specifications for installation. Ensure proper laying course and joint filling. Protect from sediment during construction. Install appropriate liner if infiltration not suitable.
Maintenance
Regular sweeping/vacuuming to prevent clogging. Repair damaged areas promptly. Monitor infiltration rates. Replace jointing material as needed. Winter maintenance considerations for frost/salt.