One principle of green infrastructure involves reducing and treating stormwater close to its source. Urban transportation right-of-ways integrated with green techniques are often called “green streets”. Green Streets achieve multiple benefits, such as improved water quality and more livable communities, through the integration of stormwater treatment techniques which use natural processes and landscaping. Green streets can incorporate a wide variety of design elements. Although the design and appearance of green streets will vary, the functional goals are the same: provide source control of stormwater, limit its transport and pollutant conveyance to the collection system, and provide environmentally enhanced roads.
Green Streets are designed to:
Numerous approaches are available for creating Green Streets including:
Here's information on Portland, Oregon's green streets program and green streets photos from the Low Impact Development Center.
Information is also available regarding several green streets projects, including a "green street" in Tacoma, Washington, the Growing Vine Street project in Seattle, Washington and the Baker Beach Green Street project in San Francisco. There are several more green infrastructure projects underway in San Francisco.
Here is a video Green Streets: The Road to Clean Water from U.S. EPA.
Closely related to Green Streets are Green Alleys, which are proliferating in Los Angeles and Chicago, as well as in several other cities.
Enhancing Sustainable Communities With Green Infrastructure U.S. EPA, 2014.
Water Environment Research Foundation - Using Rainwater to Grow Livable Communities
Beachapedia - Low Impact Development