A green alley is an alley paved with Permeable paving, either concrete or asphalt, which allows stormwater to seep through. Underneath the porous paving there is a layer of stone which aids percolation. Chicago embarked in 2007 on a "Green Alley" initiative, redoing its many alleys as green alleys.[1]


  1. "In Miles of Alleys, Chicago Finds Its Next Environmental Frontier" article by Susan Saulny in The New York Times November 26, 2007

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