27 Jul '11, 7pm

Trees: The New Sewers. How Portland is saving $$ and helping the Willamette by going from gray to green.

Trees: The New Sewers. How Portland is saving $$ and helping the Willamette by going from gray to green.

Over 800 cities across the US, including Portland, have combined sewer systems, which means that they collect and move both sewage and rainwater. During storms, these cities’ treatment plants, and the pipes leading to them, fill up with a combination of sewage and rainwater. That combination often empties into lakes, rivers, and oceans. Some of the measures Portland is taking to solve its problem include investing $1.5 billion in sewage storage, and investing in an older, cheaper, and greener stormwater management solution: trees. The city aims to plant 83,000 trees as part of its five-year, $50 million Grey to Green program. When the program started in 2008, tree canopy covered 26 percent of the city; by 2013 it should be expanded to 33 percent. The idea is that Portland should invest in infrastructure that is literally green (green roofs, trees, and natural areas), along...

Full article: http://www.americanforests.org/magazine/article/trees-the...

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