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Session 6A: Permeable Pavement

Session 6A: Permeable Pavement. Permeable Pavements. Permeable Interlocking Concrete Pavers (PICP) Pervious Concrete (PC) Porous Asphalt (PA). Pavement Sizing and Design. The depth of the stone reservoir layer (base) is set by four factors: Structural load Soil infiltration rate

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Session 6A: Permeable Pavement

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  1. Session 6A: Permeable Pavement

  2. Permeable Pavements • Permeable Interlocking Concrete Pavers (PICP) • Pervious Concrete (PC) • Porous Asphalt (PA)

  3. Pavement Sizing and Design • The depth of the stone reservoir layer (base) is set by four factors: • Structural load • Soil infiltration rate • Maximum drain time • Design storms stored or infiltrated • May or may not have underdrain, depending on infiltration rate • Cross-section specifications different for each kind of pavement (PC, PA, IP)

  4. Underdrain Sump Design Source: Hunt and Collins, 2008

  5. Stormwater Science • Due to high surface infiltration rates: • Reduce runoff quantity • Lower peak runoff rates • Delay peak flows • Even in applications with underdrains • PPs can effectively reduce concentrations of heavy metals, TSS ( • Nutrient removal capabilities less understood

  6. Construction • Each Paver Type has a different construction sequence • PC: Cover and Cure for a week • PP: Cast in Place • PICP: Manually or mechanically installed (up to 5000 sf/day)

  7. Permeable Pavers in the right situation

  8. Permeable Pavers in the wrong situation Source: Bill Hunt, NCSU

  9. Design Choices: Hotspots and Snowmelt

  10. INFORMED OWNERS • Maintenance agreements should also note which conventional parking lot maintenance tasks must be avoided: • sanding • re-sealing • re-surfacing • power washing • snow plowing and dumping • Signs should be posted on larger parking lots to indicate their stormwater function and special maintenance requirements.

  11. Overall Design Guidelines Infiltration designs reduce more runoff than underdrain designs Stable CDA (100% IC) Do not site near disturbed areas Design on Flat Slopes Maintenance Agreements

  12. Addressing common Myths • How often do these need to be maintained? • How much do they cost? • What happens at the end of the design life? • Do you need a certified installer?

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