Why ECO: Advantages/Maintenance
The Permeable Paver Advantages
EP Henry ECO™ Line of Permeable
- infiltrate, filter and decrease stormwater runoff rate and
reduce Total Maximum Daily Load (TMDL).
- are LEED® point eligible for Sustainable Sites, Water
Efficiency, Materials & Resources and/or Innovative Design;
Contribute to Green Globe points.
- meet U.S. Environmental Protection Agency (EPA) stormwater
performance criteria as a structural best management practice (BMP)
while providing parking, road and pedestrian surfaces.
- help meet local, state and provincial stormwater drainage
design criteria, and provide compliance with the U.S. National
Pollutant Discharge Elimination System (NPDES) regulations.
- are the only paver selected by the USEPA to be
used in a long term study of permeable pavement options vs.
traditional non-permeable paving.
- provide 100% pervious surface by runoff passing through small,
aggregate-filled openings between solid high-strength durable
- reduce or eliminate stormwater detention and retention ponds,
storm sewers, drainage appurtenances, and related costs.
- may be used on sloped sites with proper design.
- have the modular concrete units that allow for project phasing;
open-graded base and subbase materials are typically available
- are ideal for implementation with rainwater harvesting systems
(systems capable of storing water for on-site irrigation or
building grey water use).
- may be designed with underground stormwater storage systems,
over many slower-draining clay soils and in cold climates.
- process and reduce pollutants from vehicular oil
Construction advantages over other permeable pavement
can install and compact aggregate subbase and base with standard
- pavers, non-frozen bedding material and base/subbase are
installable in freezing temperatures over non-frozen soil
- no post-installation curing time is necessary - surface is
ready to use upon installation; modular construction allows for
Permeable Paver Maintenance
If properly installed and maintained, an EP Henry ECO Permeable
Pavers should function for many decades. Maintaining surface
infiltration and resulting exfiltration is essential to their
optimum long-term performance.
Guidelines for properly maintaining EP Henry permeable
- Once or twice annually (typically spring/fall): vacuum surface,
adjusting vacuuming schedule per sediment loading and/or any build
up of sand deposits from winter.
- Use of a dry vacuum-type sweeper is recommended during
precipitation-free periods to remove encrusted sediment, leaves,
grass clippings, etc. Vacuum and sweeper settings should be
adjusted in order to prevent removal of aggregate from the paver
voids and joints.
- The use of pressure washers on open-jointed permeable paver
systems is not recommended. Application of a commercial vacuum
sweeper with water jets, sweeper and vacuum bar attachment will
cause evacuation of clogged void materials from joint and void
openings. This material may be recycled at a wash site or new
aggregate materials may be utilized. (Refer to specifications for
size and grade). Typically, jointing materials should be swept into
joints and void openings until the bottom of the chamfer is
- For removal of water ponding on surface immediately after a
storm (due to paver joints or openings being severely loaded with
sediment): test the surface infiltration rate using ASTM C1701.
Vacuum clean to remove surface sediment and soiled aggregate
(typically ½" to 1" or 13-25 mm deep), refill joints with
clean aggregate, sweep surface clean, and test the infiltration
rate again per C1701 to minimum 50% increase.
- Adjacent properties, pavements, landscaped areas and grasses
should be monitored periodically to ensure that runoff from these
sources is not depositing silts and debris on the permeable
surface. Construction traffic, agricultural areas (no ground
cover), beach area, and areas subject to high winds that will carry
these fine particles will require more frequent sweeping than urban
- Permeable joint material may be added or replaced by
mechanically or manually sweeping into joints and void areas if
necessary. Refer to paver specifications for type and grade.
- Settlements in pavement surface, access for utility repair, and
the removal of broken or damaged pavers by an experienced paver
installer is recommended. Pavers should be extracted; setting bed
and void materials should be salvaged and kept separate.
- Base materials should be removed if access for utilities is
required. Settlement repair depending on depth can be restored with
additional base materials if settlement exceeds +/- 3/8" over a 10'
straight edge. Setting bed will be made level and pavers
re-instated with void materials replaced in joints and voids with
compaction bringing the pavers to flush and ready-to-use
During Annual Inspections:
- Replenish aggregate in joints if more than ½". (13 mm) from
chamfer bottoms on paver surfaces.
- Inspect vegetation around the paver surface perimeter for cover
and soil stability, repair/replant as needed.
- Inspect and repair all paver surface deformations exceeding ½"
- Repair pavers offset by more than ¼" (6 mm) above/below
adjacent units or curbs, inlets, etc.
- Replace cracked paver units impairing surface structural
- Check drains outfalls for free flow of water and outflow from
observation well after a major storm.
Suggested Winter Maintenance
Snow removal - Snow and ice on year-round
parking surfaces, streets and plazas can be plowed with
truck-mounted blades, power brooms, snow-blowers, or manually
shoveled. Snowplow blades should be equipped with a rubber
edge and set at 1/4" above the pavement.
Deicing - Salt may be used to melt ice if
necessary, but can affect the quality and pH of water leaving the
paver system and could require additional monitoring and analysis.
Sand is not recommended for use, as it can accelerate the rate of
clogging in voids and will require increased frequency of sweeping.
Open-graded chips may used for traction when ice is present, but
they will likely will require sweeping and removal in the
Source: ICPI Inspectors Guide for PCIP Installation and