Streetsblog San Francisco had a great post last week that reported on a recent tour of Portland’s Green Streets taken during the Congress for the New Urbanism’s Project for Transportation Reform Conference. The post includes a number of wonderful green street examples. The quality of the installations are impressive. A representative of Portland’s Bureau of Environmental Services (BES) was quoted as saying the green streets were necessitated as a result of the City’s need to comply with a Clean Water Act lawsuit. The cost of conventional stormwater infrastructure topped nearly $150 million. This cost encouraged the city to explore alternatives like green streets for reducing water volumes. David Elkin,the BES representative quoted in the post, estimates the solution saved the City $60 million dollars in stormwater pipe replacement. The post is worth checking out.