WHY ECO: Features/Performance

Professional_Why ECO_Features2

The EP Henry ECO™ line of permeable pavers provide the following features:

Technical Guidelines

  • EP Henry ECO Permeable Pavers conform to ASTM C936 in the U.S. or CSA A231.2 in Canada
  • Open-graded crushed stone recommended for all aggregates
  • Joint filling stone gradation: ASTM #8, 87, 89 or 9
  • 100% permeable surface
  • Base gradation: ASTM #57
  • Sub base gradation: ASTM #2, 3 or 4
  • Optional geotextile: consult manufacturers for selection
  • Soil subgrade: classified per ASTM D2487; tested for permeability per ASTM D3385
  • Structural design: ICPI design chart determines minimum base thickness to support pedestrian and vehicular traffic (see references)
  • ADA Compliant: joints <= ½" (ECO Cobble® and Coventry ECO Cobble® are at 3/8" and ECO Paver = ½")

Performance
Professional_Why ECO_Features300Research has demonstrated that Permeable Interlocking Concrete Pavers (PICP) can reduce runoff as much as 100% from a 3 in. (75 mm) rain event with sandy soil and a minimum 12" (300 mm) thick open-graded aggregate base.

Given regional variations in annual rainstorms and PICP base storage capacities, EP Henry ECO Permeable Pavers can reduce annual outflows between 30% and 80%. When well-maintained, they can reduce flow rates by 70% to 90% from intense rain events and up to 100% for many storms. This yields a corresponding reduction in runoff pollution.

Peak Flow Reduction and Delay
EP Henry ECO Permeable Pavers can reduce peak flow by as much as 89%, producing a hydrograph nearer to pre-development conditions. Peak flow is generally proportional to rainfall intensity. Permeable pavers delay the timing of peak flow runoff from several hours to several days.

Additional Benefits of EP Henry ECO Line

  • Comply with ADA guidelines for slip resistance
  • Available in various shapes and colors; colored pavers can be used to mark lanes and parking spaces
  • Available in SRI compliant color to minimize heat island effect
  • Simplifies surface and subsurface repairs by allowing for reuse of the  same paving units; no patches or weakened pavement cuts

Water Quality Improvement
EP Henry ECO Permeable Pavers treat stormwater by slowing runoff velocities to allow for sedimentation and filtering by aggregates in the surface openings and base. Oils adhere to small soil particles and aggregates and then are digested by bacteria.

For more information pertaining to permeable interlocking concrete pavement, please visit the Interlocking Concrete Pavement Institute (icpi.org) or the Low Impact Development Center (www.lowimpactdevelopment.org).

Source: icpi.org