Study Methodology and Results
Scientifically Defensible Approach
The study developed scientifically defensible and reproducible design methodologies using proven methods familiar to design engineers. The work focused on traditional stormwater management systems and did not include evaluation of alternative techniques such as Low Impact Design (LID), stormwater reuse, street sweeping, pervious pavement, gross pollutant separators, or wetland loadings.
June 2007 Report Deliverables
Study results were provided in the June 2007 Report, which included a series of tables, figures, calculation methods, and design examples to achieve 80% removal, 95% removal, and pre vs. post loading comparisons. The method was vetted by the Districts and interested parties through a series of Public Workshops.
Key Focus Areas
- Traditional stormwater management systems
- Scientifically defensible and reproducible methods
- Design approaches familiar to practicing engineers
- Comprehensive calculation methodologies
- Public workshop vetting process
✔ Widespread Adoption
Districts adopted the report as a standard method of calculating load reductions for use in pre vs. post analyses. It forms the basis of loading calculations and removal efficiencies used in the new Statewide Stormwater Rule and BMPTrains.