HOW WE HELPED
The stream restoration strategy focused on a cost-effective stream design to generate impervious area credit and local total maximum daily load (TMDL) reductions for meeting the County’s MS4 requirements. The stream design incorporated a site-specific, comprehensive design that included planform, cross-section, and profiles. Structures integrated into the design primarily consisted of a series of riffle grade control and cascade structures with two outfall dissipation pools to help mitigate the impacts of headcut migration and protect private and County infrastructure. Mowed and maintained areas were carefully coordinated with adjacent residents.
The team worked closely with the County and residents to develop a landscaping plan to enhance the riparian corridor to meet the County’s and homeowner’s objectives. The riparian corridor was landscaped with native seed, trees, and shrubs along the 1,500-linear-foot buffer. Climate resiliency was the foundation for decisions made including expanding the project limits to re-configure a roadside grass swale described by the long-term property owner as being under capacity from historical sedimentation. MS4 credit for the stream was achieved through the application of Protocol 5 which included field measurements, soil nutrient sampling, and bulk density sampling to support the crediting calculations for implementing a cost-effective crediting strategy for the County.
