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2000 - 2001
Project name
Evergreen School: bioswale and retention ponds restoration
Evergreen School, City of Shoreline
N. Ng-A-Qui (UW Seattle; Forest Resources), T. McDonald (UW Seattle; Education and Biology), C. Updegrave, C. Strand (UW Seattle; Biology - Botany)
Site description
The stormwater system adjacent to the school included a poorly functioning, compacted and largely-unvegetated bioswale as well as two stormwater retention ponds that were dominated by non-native plant species (e.g., reed canarygrass).
Restoration challenge
Clients wished to restore a diverse native plant assemblage in the site that would create habitat and educational opportunities while enhancing the stormwater control and filtration functions. The bioswale was heavily compacted from adjacent playground spillover activities and the ponds dominated by non-native species.
Restoration approach
UW-REN students, working with school children, teachers, parents, and community members, removed non-native species from the ponds and installed native plants in the bioswale and pond areas. A “Trail of Discovery” ethnobotany feature was designed and installed in cooperation with school classes. Native trees, shrubs, grasses, and herbs were added along with mechanical barriers for weed control with a focus on species to (1) rapidly establish a shade canopy to control reinvasion by non-native species, (2) promote succession to a mature forested wetland, (3) highlight important Native American ethnobotanical topics, and (4) create structural diversity in the vegetation for habitat. This was done in concert with improving the stormwater control and filtration functions required of these features.