Stormwater

The detention and treatment of stormwater is a critical component of any Pacific Northwest project. Century West understands that stormwater is a hidden component in most new development and rehabilitation projects and plans accordingly from project kickoff through construction. We have experience implementing a variety of stormwater treatments, including porous pavement, low-impact development solutions such as street planters and swales, and large-diameter storm sewer facilities.

Contact us about Stormwater Services

Port of Bremerton, South Hangar Project

The Port of Bremerton's AMP, focusing on south hangar improvements, was initially planned for small aircraft facilities with two taxilanes per FAA approval. By 2018, a shift towards larger corporate hangars emerged, leading to a review by Century West to meet these demands and allow for future expansion. This involved stakeholder collaboration, alternative layouts, and regulatory compliance. The phased development saw the completion of three executive hangars in Phase 1 by 2020, with Phase 2 adapting to a mix of corporate and small aircraft needs. Key items were infrastructure upgrades and environmental compliance, continuing the 2014 AMP's vision for growth and adaptability at Bremerton Airport's south hangar area.

Auburn Municipal Airport, Runway 16/34 Extension

Century West assisted the City of Auburn with its runway extension project, initiated during the 2015 AMP. Due to urban constraints, it highlighted the need for runway extensions at both ends, leading to an environmental assessment in 2017 and subsequent documentation for FAA approval. Western Washington’s strict stormwater guidelines required significant storage and treatment for the new impervious surface associated with the runway extension, approximately 1.2 acres. Open-air drainage facilities are discouraged due to the potential for attracting wildlife. Thus, Century West designed underground stormwater detention chambers, providing around 1.8 acre-ft of storage. This innovation also facilitated the removal of an open-air pond and supported potential future expansions.

City of Lake Oswego, Fosberg Road Drainage Improvements

This project involved remedying an underperforming 2,000 LF stormwater collection and conveyance system on Fosberg Road that had ongoing maintenance issues, was overcapacity, and resulted in runoff leaving the right-of-way. Century West completed hydraulic modeling, including assessing existing basins adjacent to the project that were contributing to the Fosberg/Carmen Drive stormwater network. In addition to upgrading the 8-inch existing line to an 18-inch proposed line, Century West developed a modified mountable curb and gutter to replace existing asphalt berms, control runoff, and avoid detrimental effects at the numerous steep driveways along this stretch of roadway.

City of Sandpoint, Downtown Revitalization

The City of Sandpoint made First Avenue and Cedar Street two-way and pedestrian-friendly, encouraging local business growth. Century West and our team reshaped the area into a tree-lined boulevard with wider sidewalks, parking, and pedestrian lights, improving aesthetics and utilities like storm and sanitary sewers. The project, funded by the Urban Renewal Agency, was phased to keep businesses open during tourist season and manage construction. Successful public outreach and planning were key, including meetings with property owners and coordinating with businesses to ensure access during construction.

City of Eagle Point, Linn Road Improvements

Linn Road is the centerpiece corridor between Highway 62 and the City of Eagle Point’s downtown district. Century West, overseeing the project's design and management, emphasized incorporating planter swales. These swales are not only aesthetically pleasing but also play a crucial role in managing stormwater runoff, reducing the impact on the City's drainage system. The project also included ADA-compliant ramps at all intersections, dedicated travel and bike lanes in each direction, and retaining walls as part of a comprehensive approach. Century West's coordination with four utility companies was instrumental in transitioning to underground utilities, enhancing the corridor's visual appeal and functionality.