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Friday, July 3, 2009

Pervious Concrete - Hardscaping that Allows for Water Absorbsion

Sometimes you need to provide a hardscaped surface that is not totally non-pervious -- as is typical cement and asphalt. For certain appliations like driveways or parkling areas ... perviose concrete is the answer.

Pervious pavement solve the need for a hardscape surface that can also allow water to soak in to the earth rather than flow into a storm sewer. Using a pervious hardscape can forgo the need for more costly solutions to handle water flow such as catch basins and ponds to allow for a more controlled flow and absorption.

" ... a unique and effective means to address important environmental issues and support green, sustainable growth.... porous concrete is instrumental in recharging groundwater, reducing stormwater runoff, and meeting U.S. Environmental Protection Agency (EPA) stormwater regulations. ... pervious concrete is among the Best Management Practices (BMPs) recommended by the EPA ... for the management of stormwater runoff ..."

" ... Typically, between 15% and 25% voids are achieved ... flow rates ... typically around 480 in./hr (0.34 cm/s, which is 5 gal/ft²/ min or 200 L/m²/min),... "

Via: PerviousPavement LINK
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