Works / Stormwater Retrofitting Gabriel Park Water Quality Project / Portland, Oregon

Gabriel Park Water Quality Project

The Fanno Creek watershed is heavily impacted by urbanization. Urban streams are suffering from increasing impervious surfacing that results in increased runoff and higher stream velocities. Gabriel Park is symptomatic of these factors: swales have become unsafe gullies; forest groundcover vegetation is absent; park lawns have become severely compacted through overuse and provide little infiltration. The Vermont Tributary of Fanno Creek, which runs through the park has been severely impacted by those factors. GreenWorks developed several concepts to improve water quality for surface runoff in the park and presented these to three neighborhood groups. We provided schematic designs for various stormwater mitigation options, including: a wet pond/marsh treatment system; forest ground-floor revegetation; biofiltration swales; and creation of a wet meadow. GreenWorks provided final design and bidding documents.