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Old Posted Jun 27, 2008, 7:16 PM
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aaron38 aaron38 is offline
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Chicago's Back Alleys Filter Rainwater for Lake Michigan

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CHICAGO, Illinois (CNN) -- Environmentally friendly engineering is really right up Chicago's alley -- in a city project called "Green Alleys." The program aims to stop polluted rainwater in the city's alleyways from ending up in adjacent Lake Michigan.
So, the extreme alley makeover started with the pavement. The alleys are being resurfaced with concrete, asphalt, or paving stones that are permeable -- that is, water runs through them like a sieve to the dirt beneath.
Microbes that thrive on stuff like fertilizer and oil are either seeded into the pavement, or they migrate there naturally. They cleanse the water of pollutants that come from cars and lawns. The cleaner water eventually makes its way into the groundwater -- called an aquifer -- and then flows into Lake Michigan.
http://www.cnn.com/2008/TECH/biztech...ete/index.html
I don't know if this is old news, but this was the first I'd heard of this program, which sounds like a damn good idea.
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Old Posted Jun 27, 2008, 11:11 PM
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Originally Posted by aaron38 View Post
I don't know if this is old news, but this was the first I'd heard of this program, which sounds like a damn good idea.
I heard about this on Chicago Works last summer.
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Old Posted Jun 27, 2008, 11:36 PM
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Great to hear Chicago is doing this - effectively.

In Oak Park a street can be resurfaced with brick if the residents approve ( ask for ? ) it. I think this is only when they are replaced in the normal course of maintenance.

A good example of a permeable surface is at the Morton Arboretum where the parking lot is done in permeable brickwork.
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