Rain Garden - Portland, Oregon
Posted by: 
howarthe
N 45° 31.603 W 122° 39.828
10T E 526253 N 5041519
This rain garden was installed in 2003 at a cost $450,000. It collects rain water from the 5 acre roof of the convention center and removes sediments before draining into the Willamette River saving the Center $15,600 every year.
Waymark Code: WM8N0J
Location: Oregon, United States
Date Posted: 04/21/2010
Views: 4
The rainwater garden at the Oregon Convention Center collects and treats water from 5.5 acres of roof area. The 318 foot long channel simulates a mountain stream with basalt columns and
wetland plants like dwarf willow, redosier dogwood, sedges, rushes, and water iris. Terraced cobbled sedimentation basins slow the water, allowing sediments to filter out and increasing time for infiltration. The Oregon Convention Center saves $15,600 on its stormwater bill annually because of this feature. Additionally the rainwater garden helps save water because it does not need to be irrigated as heavily as the rest of the landscaping on the grounds. Surface runoff from the expanded loading dock area is also collected through a separate siphoned inlet then passed through an oil-water separator before the water flows into a 205 linear foot vegetated swale. This filtered water enters the rain garden at the lowest detention basin.
Source: Oregon Convention Center Rainwater Garden at Portland Online.com