...its rainwater back into the ground.
Via the 13th Floor, the blog of Governing Magazine, here's a story from Monday's New York Times about the Windy City's use of a new technology to relieve its overburdened storm water system and recharge the groundwater.
Apparently, there are such things as permeable concrete and porous asphalt which allow water to move through the street surface where it is filtered through a bed of stone before seeping back into the ground. And all this time, I thought I was just dreaming about such a thing. Aside from protecting waterways (since storm water runoff usually mixes with all kinds of chemicals and oils before moving through pipes and being dumped into the rivers), these new streets have other benefits:
The new pavements are also designed to reflect heat from the sun instead of absorbing it, helping the city stay cool on hot days. They also stay warmer on cold days. The green alleys are given new kinds of lighting that conserve energy and reduce glare, city officials said, and are made with recycled materials.
Add this to its commitment to green roof technology, and it looks like Chicago is well on its way to taking a major step towards reducing water pollution and mitigating drought.
Since that city is also in a particularly cold, winter climate, Chicago will also be a good laboratory for other cities to see how these new alleys deal with the freezing and thawing cycle that tears up traditional asphalt streets.
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