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Permeable Cobblestone Flower
Permeable Cobblestone Flower
Permeable courtyard is set off by this flower constructed with 3 colors of granite cobblestone.

Permeable Patio
This raised, elliptical, permeable paver patio prevents runoff directly behind its terrace wall. See more photos in
'Before and After'.

Granite Cellar Steps
These cellar steps use a permeable cobblestone base instead of a drain to keep water away from the basement door.

Granite Cellar Steps
A heavy-duty crushed stone base topped by crushed white granite make this waterfront driveway permeable.
Permeable Overview
The national publication, Landscape Contractor - Design, Build & Maintain featured this permeable driveway built by Natural Path Landscaping in its August 2012 issue.

Green paving technology manages storm water naturally
Permeable paving is specifically designed to allow the passage of water through the paving, and the temporary storage of water underneath the paving-all part of a process that minimizes oil and gasoline pollution of ground water. This is especially important if zoning requires a minimum percentage of impervious area or if storm water requires safe passage for groundwater recharge without runoff or a retention pond.

If a house sits lower than the street, permeable paving brings the added advantage of draining water into the driveway and into the crushed stone reservoir below, eliminating the need for an unsightly drain grate in the driveway. In fact, if the house is susceptible to basement flooding, pipes can even be put in the driveway reservoir to carry surplus water away from the home.

How it works
Interlocking concrete permeable paving allows storm water to enter the paving between crushed-stone-filled joints, then pass through to a layer of larger crushed stone, before entering a lower level of crushed stone voids for storage. Within these voids, naturally occurring micro-organisms digest oil and other pollutants that have accumulated. Finally the water in the voids filters back into the subsoil without the suspended solids and automobile-dripped pollutants contained in normal storm water run off.

Winter benefits
During the winter months, permeable paving allows all precipitation and snow melt to be absorbed into the paving, eliminating surface puddles and potential for refreezing. In addition, experience suggests that the deep voids within the permeable paving may contribute to more rapid snow melt due to the warmer earth below.

Construction of permeable paving
These pictures show the proper construction of an interlocking concrete permeable paving driveway and parking area built on well-draining subsoil. First, the area is excavated to a depth of 21 inches below the final pavement surface. Then a 12"-thick, compacted layer of clean 1-1/2" to 2-1/2" crushed stone is installed. The thickness of this layer (and depth of excavation) depends upon how fast the subsoil can absorb the water that filters into the paving and how much storage capacity is desired. Our studies have shown that our large crushed stone base has about a 40% storage capacity between the voids, allowing a 12"-thick base to store almost 5" of water.

Excavated to proper depth
 
Compacted Crushed Stone
Area excavated to a depth of 21" below
final surface with compacted subsoil.
 
A twelve-inch-thick, compacted layer
of 2" crushed stone provides support
and a water storage reservoir.

On top of the coarse crushed stone layer is a 4"-thick, compacted layer of clean 3/4" crushed stone. Next, a 2"-thick layer of smaller 3/8" clean crushed stone serves as the bedding layer directly under the 3-1/8"- thick interlocking permeable, concrete pavers. This same 3/8" clean crushed stone is swept between the joints of the permeable pavers. The pavers shown measure approximately 10" x 5" x 3-1/8"-thick with about 3/8"-wide joints partially around the perimeter. Granite edging restrains the pavement edges and extends down into the base layer.


Please click on the photos to see a larger image of our work.

Layer of " crushed stone is compacted on top of the base layer of large stone.

Layer of ¾” crushed stone is compacted on top of the base layer of large stone.
 
Layer of ¾” crushed stone is compacted on top of the base layer of large stone.
     
     

Permeable pavers are laid on a 2"-thick bedding layer
of crushed stone with granite edge restraints.

Permeable pavers are laid on a 2”-thick bedding layer  of crushed stone with granite edge restraints.
     
     

Pavers are compacted to provide an even, flat surface
and then crushed stone is swept between the joints.

Pavers are compacted to provide an even, flat surface  and then crushed stone is swept between the joints.
 
Pavers are compacted to provide an even, flat surface  and then crushed stone is swept between the joints.
     
     

Finished result incorporates an existing
slate walkway that has been rebuilt to
blend with the permeable parking area.

 

Finished result incorporates an existing  slate walkway that has been rebuilt to blend with the permeable parking area.
 
Finished result incorporates an existing  slate walkway that has been rebuilt to blend with the permeable parking area.
     
     

Asphalt driveway & bluestone walkways interface with permeable
courtyard featuring a unique flower design. When the customer suggested
a flower motif in the style of the architect H.H. Richardson, Tom created
the design and constructed it with 3 colors of granite cobblestones.

Pavers are compacted to provide an even, flat surface  and then crushed stone is swept between the joints.
 
Pavers are compacted to provide an even, flat surface  and then crushed stone is swept between the joints.
     
     

This permeable patio had nowhere for the water to drain except below its
surface. The rocks for the steps were unearthed during the patio excavation.

Permeable Patio
 
Permeable Patio
     
     

This permeable courtyard prevents water from running down the driveway.

Interlocking concrete permeable pavers of a different color with a herringbone pattern and granite edge restraint
     
     

This driveway slopes directly into the house and had a history of flooding the garage. Now the driveway is permeable with a 1200-gallon drywell buried beneath. We do not need a drain to reach the drywell since water flows directly through the paving.

Interlocking concrete permeable pavers of a different color with a herringbone pattern and granite edge restraint
     
     

Interlocking concrete permeable pavers of a different color
with a herringbone pattern and granite edge restraint.

Interlocking concrete permeable pavers of a different color with a herringbone pattern and granite edge restraint