Stormwater case Study;
Bio-retention in Oregon Parking Lot
Grants from the Great Lakes Restoration Initiative (GLRI) Surface Water Improvement Fund (SWIF) are funding the design and construction of several stormwater management projects in Lucas County. The University of Toledo is evaluating those pilot projects with the goal of providing information to developers who want to reduce the amount of stormwater entering sewer systems, remove pollutants from the water, and do so cost effectively. The TMACOG Stormwater Coalition is providing a forum for the grant recipients to discuss and collaborate on their projects.
The City of Oregon received a SWIF grant to naturally treat stormwater at a recreational facility. Before the project, all the stormwater ran to storm sewers which drained directly into Wolf Creek with no treatment. Rain and snowmelt pick up oil and other drips from cars as well as trash and other pollutants. Don Nelson, Environmental Specialist with the City of Oregon, developed a plan to direct water to planted bioswales. These swales are constructed with engineered soils and planted with native, long rooted plants. The swale naturally holds stormwater and allows it to infiltrate slowly. There is a subsurface drip irrigation system to water the plants during times of low precipitation.
Plants going into the swale include:
• Grasses; Big Bluestem, Little Bluestem, Indian Grass, Prairie Dropseed, Canada Wild Rye
• Sedges and forbs: a wide range including Butterfly Milkweed, Blue Wild Indigo, & Bottle Gentian, Prairie Blazing Star, Brown-eyed Susan, Culvers Root, and Swamp Milkweed