WHY ECO: Features/Performance
The EP Henry ECO™ line of permeable pavers provide the
- 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
- 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
- ADA Compliant: joints <= ½" (ECO Cobble® and Coventry ECO
Cobble® are at 3/8" and ECO Paver = ½")
Research 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
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
- Simplifies surface and subsurface repairs by allowing for reuse
of the same paving units; no patches or weakened pavement
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).