a relatively recent project established was the seattle, washington street edge alternatives project, completed in 2001. rather than using traditional piping, sea's goal was to create a natural landscape that represented what the area was like before development. the street was 11% more pervious than a standard street and was characterized with evergreen trees and bioswales. the bioswales were planted on graded slopes with wetland and upland plants. other landscaping also focused on native and salmon-friendly plants. sea provided a strong benefit for stormwater runoff mitigation that helped continue to protect seattle's creek ecology. the project street also created a more inviting and aesthetically pleasing site as opposed to hard landscaping.