• Storm-water runoff is the No. 1 cause of water pollution in suburban and rural areas. But in Portland, Oregon, an innovative system of curbs,
    gutters, roofs and rain gardens diverts runoff and sharply cuts water pollution – and is spawning a major tourist attraction.

    So popular is the “Green Streets” program that the city publishes a map on its website directing tourists to the most exciting storm sewer sites.

    Read More…
    http://www.usatoday.com/news/nation/environment/2010-03-28-portland-sewers_N.htm