PERMEABLE INTERLOCKING CONCRETE PAVERS
INSIDE THE FLOODPLAIN | OUTSIDE THE FLOODPLAIN

What Is It?

Cost: $2.50-$10.00 per sq ft
Applications: Parking lots, pathways, sidewalks, plazas, driveways, public spaces. Can be used in high weight but low volume/speed roads (industrial or residential).
Service Life: 20 – 40 years

Permeable interlocking concrete pavers (PICPs) leave open void spaces filled with gravel between pavers to allow for water infiltration. These filled joints can allow for infiltration rates of up to 50 inches per hour with regular maintenance (e.g. street sweeping/vacuuming and refilling of displaced gravel) and 3-4 inches per hour without, though in practice, infiltration rates will depend on the permeability of the subgrade soil. PICPs meet U.S. EPA stormwater best management practice criteria for parking, road, and pedestrian surfaces.

PICPs have very high load-bearing strength, often exceeding 1 million lbs/sq ft, more than double the compression strength of concrete slabs. PICPs come in a wide variety of shapes, sizes, and colors, allowing for a diverse range of applications while preserving the surrounding aesthetic. The maximum slope of PICPs is higher than that of other permeable pavements, allowing for a slope of up to 12% while maintaining infiltration.

Benefits

  • Enhances groundwater infiltration while reducing stormwater runoff volume, rate, and pollutants.
  • Light colored PICPs can reduce urban heat island through increased reflectivity and evaporative cooling
  • Available in wide range of colors and shapes to preserve urban aesthetic
  • Very high load-bearing strength
  • Easy to repair – units can be easily removed and reset
  • Reduces occurrence of black ice/freezing puddles in cold climates; requires fewer applied deicers
  • Reduces road noise.

Drawbacks

  • Pollutants and deicing salt can infiltrate groundwater. Should not be installed in areas where hazardous material spills are possible.
  • Can be more expensive than other permeable pavements. Higher installation cost.

Regulatory Impacts and Requirements

A summary of potential regulatory touchpoints follows below.
Permeable-Interlocking-Concrete-Paver

Financing Options, Incentives, And Rebates

Additional Resources

PROJECT EXAMPLES

SAMPLE OF SUPPLIERS

  • PaveDrain: Pavers with an arch-shaped retention cell beneath each unit
  • UNI-Group USA Ecostone: Interlocking concrete pavers, come in multiple varieties (500-2000 in/hr infiltration rate)
  • Xeripave: Super-pervious pavers made of bound aggregate
  • Pavers by Ideal: Aqua-Bric and EcoStone pavers

SOURCES

Photo credit: Image is part of the public domain