Source Loading and Management Model (WinSLAMM)
The storm water pollution modeling evaluation conducted for the University of Wisconsin Oshkosh followed the guidelines provided by the WDNR for compliance with the MS4 permit.
As a result of this evaluation, the following conclusions are made:
- Accounting for all of the existing management measures, UW Oshkosh is currently reducing its pollution load by 1.1 tons per year (7.9 percent). Therefore, the University has not met the TSS reduction requirements of their MS4 Permit for neither the 2008 goal (20 percent) nor the 2013 goal (40 percent).
- Since both the 20 percent and the 40 percent TSS removal goals have not been met, additional best management practices are necessary for UW Oshkosh to gain MS4 compliance. Proposed BMPs include the removal of three existing parking lots as well as new bio-filter design and construction to treat 10.3 acres of existing parking lots.
- After construction of the proposed BMP’s takes place, the campus would be at 28 percent TSS control level. It will still need to reduce sediment loading by 1.9 tons/year. An alternative to the campus constructing more BMP’s to further reduce the annual sediment loading may be for the campus to work cooperatively with the City of Oshkosh. Section 2.10 of the MS4 permit allows for intergovernmental cooperation to perform one or more of the conditions in the permit. It may be more feasible to achieve the UW Oshkosh pollution control requirements on various locations throughout the city. This approach would likely require long-term agreements between UW Oshkosh and the city to define the roles and responsibilities of each party.
- The University of Wisconsin Oshkosh should review these results with the WDNR to finalize their MS4 permit compliance for the TSS reduction requirements.