Clackamas County Water Environment Services (WES) hired GreenWorks to prepare a master plan for Clackamas High School that identifies and prioritizes potential stormwater low impact development retrofit projects. The second phase of the project will be to design and build one or more projects (such as rain gardens, green roofs, structural soils, etc.) that can visibly demonstrate the benefits of low impact development practices to students, teachers, parents and the general public. The project(s) are also intended to reduce the negative impacts of stormwater runoff on local streams from the substantial impervious area at the High School. As part of the master planning process, we interacted with high school science classes, telling students about Low Impact Development (LID) and gathering their input on project options. When a project(s) is selected for design and implementation, students will, as possible, help with planting and long-term care.
As a subconsultant for this regional water quantity and quality control project, we were responsible for design development of the four acre water quality facility, which includes a sedimentation pond with a wetland treatment facility. The wetland treatment facilities incorporates an emergent marsh, scrub-shrub community, and a riparian forest. Our tasks included preparation of graphic illustrations for a public meeting, at which we were present to answer questions.
Lori Faha and GreenWorks conducted an inventory of public high schools and middle schools located inside the Clean Water Services (CWS) boundary to identify opportunities to retrofit sites with Low Impact Development Approaches (LIDA) for stormwater management. The resulting report uses photos and site inventory forms to highlight potential retro-fit projects such as rain gardens and stormwater planters to capture runoff from roofs and parking lots. The report will be used by CWS staff to prioritize projects for design and construction by the agency and for identifying potential projects for school teacher/student implementation.
Hillsboro Parks and Recreation contracted with GreenWorks and an interdisciplinary team to evaluate opportunities and constraints and propose recommendations for a 2500 lineal foot section of Rock Creek. Project goals included reconnecting the creek to its floodplain, enhancing floodplain fish and wildlife habitat, and providing passive recreation opportunities for the greenway. GreenWorks designed a concept plan including new stormwater treatment facilities between adjacent developments and the riparian corridor, a backwater habitat, overall vegetation management strategies, trails, overlooks, and a pedestrian bridge crossing.
In November of 2014 GreenWorks began a site assessment and preliminary design for the Johnson Creek Oxbow Enhancement Project. The central feature of the site is the namesake “Oxbow” meander, which is bounded on the south by a bypass channel that truncates the oxbow creating an island. The by-pass channel was constructed by the Works Progress Administration (WPA) in the 1930’s and included armoring the creek bed and banks, and creating a fish ladder in the oxbow to maintain fish passage. The goal of the WPA work was to convey flood flows efficiently downstream. It resulted in a confined channel, which is hydrologically disconnected from adjacent floodplains and wetlands, and exacerbates flooding. GreenWorks was charged with providing design strategies for improving floodplain hydrology, riparian and in-stream habitat, and local flood impacts.
To support these goals, GreenWorks held a one day charrette, which included members from BES, ESA-Vigil Argimis, and KPFF to discuss and recommend a variety of design strategies for improving the inherent conditions found within the Johnson Creek Oxbow. Recommendations were collected and vetted amongst the consultants and further discussed with BES to determine a set of design alternatives for specific sites within the project area. Project sites were mapped, along with support graphics and images, and cost-estimates, to BES in a comprehensive Pre-Design report, thus allowing BES to prioritize future improvement projects for the Johnson Creek Oxbow area.
GreenWorks provided landscape architecture services for Portland’s Bureau of Environmental Services Flyway Wetland property located between the Columbia Slough and the Columbia River near the Portland airport. GreenWorks led a team to provide several wetland restoration concepts and a wetland delineation report. GreenWorks headed several workshops with the consultant and team to develop the preferred concepts based on goals for the project including: water quality improvement; vegetation and habitat restoration; wetland hydrology improvement; and floodplain wetland hydrology improvements. Wetland and Stream Delineation Reports and Wetland Restoration Concepts were created for internal analysis related to bureau’s goals for restoring the site and their overarching restoration goals for bureau’s environmental group.
In January 2010, GreenWorks and BES staff conducted intensive field work locating and documenting potential locations for stormwater facilities throughout the Columbia Slough Watershed in North Portland. The Columbia Slough has been designated a high priority area by the City of Portland for improving watershed health and reducing pollutants. The project team focused on four target areas where green street facilities would maximize stormwater quality treatment and capture contaminated sediment before being discharged into the Slough. Each potential green street facility was ranked based on its potential performance, feasibility, and cost. GreenWorks assisted BES in project prioritization and provided an overall ranking using Geographic Information Systems (GIS). Over 150 potential green street facilities were identified, which would potentially result in stormwater treatment from over 35 acres of impermeable surfaces.