Why ECO: Installation of Permeable Pavers

This overview is intended to be a basic guide to permable paver installation and to explain the site conditions that dictate the specific methodology required for proper performance. EP Henry recommends you consult a Professional Engineer (PE) for permeable pavement installation.

homeowner_why ECO_installation

Determining the onsite underlying soil type (clay, silt, sand) is the first step in
choosing the construction detail that's appropriate for your project. Although
the surface infiltration rates of EP Henry's ECO Paver, ECO Cobble and ECO Bristol Stone are extremely high, the infiltration rates of the underlying soils determine how quickly captured water will infiltrate into the ground.

Ideally, the quantity of water that enters a permeable paver system should
infiltrate/exfiltrate your permeable paver system within 24-48 hours. However, it's possible that your underlying soils can't absorb water rapidly enough due to the composition of the soil. In cases where your soil can't absorb the water received in a given precipitation event within 24-48 hours, conveyance movement via drainage pipes to additional storage or infiltration areas may be appropriate.

Infiltration: The penetration of water through the ground surface into the subsoil

Exfiltration: The loss of water from a drainage/permeable pavement system into the surrounding soil

In basic terms, clay can absorb the least amount of water, and sand can absorb the most. It is important to note that when using the Partial or No Exfiltration construction details, a drainage pipe is specified which must have positive
flow away from the aggregate base. This drainage pipe can be directed to auxiliary on site infiltration trenches, rain gardens, bio-swales, detention basins, or nearby storm pipes. Municipal approval is required for any stormwater "tie-ins."

The following represent several common details for ECO Paver, ECO Cobble and ECO Bristol Stone:


No Exfiltration

Appropriate for soils having high clay content, those constructed over bedrock, a high water table, or environmental "hot spots"


Partial Exfiltration

Appropriate for soils of medium texture, with roughly equals portions of sand, silt, and a little less clay

Full Exfiltration

Appropriate for soils that are very sandy, with no clay, and very few fine particles