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Pervious concrete pavement allows storm water to pass directly through the concrete pavement. This allows water to infiltrate the ground naturally, recharging watersheds and replenishing ground water supplies while protecting wildlife habitats and greater ecosystems. Because pervious concrete allows 3 to 8 gallons of water per minute to pass through each square foot of the material, it provides an excellent alternative to expensive storm water collection and detention systems with the strength and performance of conventional concrete paving.

Pervious concrete is made from carefully controlled amounts of water and cementious materials used to create a paste that forms a thick coating around aggregate particles. Unlike conventional concrete, the mixture contains little or no sand, creating a substantial void content – between 15% and 25%.

Why is pervious concrete a sustainable solution?

• Eliminates untreated storm water and creates zero runoff

• Directly recharges groundwater

• Mitigates first flush pollution

• Protects streams, watersheds, and ecosystems

• Mimics the drainage and filtration of bioswales and natural soils

• Reduces surface temperatures and heat island effects

• Eliminates the need for expensive collection and detention systems

• It is free from petroleum products, thus oils do not sink into local soil

Pervious concrete paving may be used for patios, sidewalks, trails, sports courts, residential driveways, streets, and general parking areas. Generally, pervious concrete pavement depths range from 4 inches for sidewalks and trials to 5 - 6 inches for residential driveways and parking areas.

What about freezing and thawing?

Water passes directly through the pavement and into the retention layer below, so freezing and thawing is not a concern in Western Washington as our temperatures and freezing-thaw cycles are nominal.

What about clogging?

The likelihood that a majority of any pervious surface will become 100% clogged is very low, even in areas with high conifer needle fallout.  Clogging of any pervious surface can occur, but water will always seek the next point of infiltration adjacent to the clogged column.

What about maintenance?

Common sense approaches to prevent placement of landscape materials and cleaning of any pervious surface are recommended practices.  Periodic sweeping is typically sufficient to ensure the pavement works to its fullest capacity.

Green Construction

Use of pervious concrete is among the Best Management Practices (BMP) recommended by the EPA and other agencies for the management of storm water runoff on a regional and local basis.  Pervious concrete may also contribute to LEED credits for green building.

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Precision Concrete NW, Inc.

WA Contractor # PRECICN004NW ∙ Licensed, Bonded & Insured

PO Box 574, Port Orchard WA 98366

Phone: 360-876-7415 ∙ Toll Free: 877-876-7415

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