Century West completed the design of improvements for two auto storage yards at the Port of Portland’s Terminal 6 (T6) encompassing a total of 51 acres. The improvements include surfacing of the entire 51-acre auto storage area, fencing, landscaping, and lighting. In order to deal with the large volume of stormwater runoff that would be generated from 45+ acres of impervious surface, the design utilized a porous pavement system and a series of vegetated swales to infiltrate 100% of the stormwater on site. The majority of the paved surfaces are porous pavement. Traditional impervious pavement was used in some areas to balance the cut and fill on the site and in areas where additional structural capacity was required. The runoff from the traditional pavements is infiltrated through on site swales that are incorporated into the landscaping for the site.
The use of onsite infiltration methods allowed for a significantly shortened design and permitting process that made construction during 2006 possible by avoiding the need for US Army Corps of Engineers or Oregon Division of State Lands permits for an outfall to the Columbia River. The use of porous pavement also allowed the Port to avoid City of Portland stormwater fees that are calculated by the area of impervious surface on a site. In addition to the cost and time savings, the porous pavement and infiltration swales provide filtering of the stormwater and mimic the predevelopment hydrologic cycle which provide improvements to the overall water quality in the vicinity of the site.
The Oregon Chapter of the American Public Works Association (APWA) awarded the Julian Prize for Sustainability for Public Works to the Port of Portland for the T6 AWC Improvements project. The Julian prize is awarded to people, projects, and practices to recognize excellence in systems thinking, long term design practices, and infrastructure systems in public works that further sustainability.