IMPROVING EFFECTIVENESS AND EVALUATION TECHNIQUES OF STORMWATER BEST MANAGEMENT PRACTICES

摘要

Numerous regulations in the United States and New Zealand require the implementation of best management practices (BMPs) for reduction of stormwater nonpoint source pollution. Proprietary treatment systems targeted for space-limited "ultra-urban" situations have recently emerged on the market, the applications of which are rapidly increasing without proven effectiveness. In the current paper, results are presented of an extensive field monitoring program of the Stormvault™, manufactured by Jensen Precast, which shows that the system effectively reduced the effluent to low event mean concentrations (EMCs), which were comparable to reports for conventional BMPs. Confidence intervals (95%) on the mean indicate an upper level of EMC_(out) at 12.5 mg TSS/L for a "typical" vault configuration. Under the specific testing conditions, pollutant mass removal efficiencies are comparable to many conventional systems, and satisfies regulatory goals of up to 80% long-term TSS removal. Multiple linear regression techniques were used to identify relationships between factors influencing pollutant removal efficiency as well as outlet concentrations under a variety of rainfall and runoff conditions. The simple equations can be used to directly compare multiple systems for a given site, between watersheds, or to evaluate changes in performance due to modified system design.