City Service
Service Facts

Department:

City Services

Service

Green Alleys

Green Alley Construction

 

Chicago's Green Alley program is one of many environmentally friendly initiatives put forth by CDOT.


Green alleys incorporate a variety of characteristics:

  • Permeable pavements (asphalt, concrete or pavers) that allow stormwater to filter through the pavement and drain into the ground, instead of collecting on hard surfaces or draining into the sewer system. The pavement can be used on the full width of an alley, or simply in a center trench.
  • Open bottom catch basins--installed in alleys to capture water and funnel it into the ground
  • High-albedo pavement, a lighter-colored surface that reflects sunlight instead of absorbing it, helping reduce the urban heat island effect
  • Recycled materials, such as concrete aggregate, slag and recycled tire rubber

 

Other green alley techniques include using proper grading and pitch to facilitate drainage, and using dark sky-compliant light fixtures to reduce light pollution and provide uniform illumination.

Green Alleys are part of CDOT's "green infrastructure" -- which includes recycled construction materials, permeable pavements and other efforts.

The program began as a pilot in 2006, and through 2010, more than 100 Green Alleys have been installed.

The handbook below provides an overview of CDOT's Green Alley program.

 

Green Alley Handbook

Department Main Office

Transportation