Predicting the Long-Term Performance of a Structural Best Management Practice with the BMP ToolBox Model

摘要

It is costly to constantly sample to monitor the performance of a structural best management practice (BMP).nAlternatively, occasional sampling might not be adequate. The BMP ToolBox model, developed by Tetra Technand Prince George’s County in Maryland, USA, assesses the performance of a structural BMP treatment site. Thenstudy applied the BMP ToolBox model to a BMP site in Taiwan to test its validity. The case study site wasndesigned to remove pollution from nonpoint sources (tea gardens) in order to maintain water quality in thenFeitsui Reservoir. The BMP ToolBox model was calibrated and verified using two years of sample data. Resultsnwere satisfactory with the coefficient of determination (R2n) for calibration and verification being 0.87 and 0.8,nrespectively. Furthermore, the one-factor-at-a-time method (OFAT) was applied in a sensitivity analysis tonidentify sensitive model parameters. Several hydrographs were created to predict BMP performance. The pos-nitive relationship between the total phosphorus (TP) removal rate and the recurrence interval was observed:nrainfall with longer durations showed increased removal rates compared to shorter periods of rainfall. The BMPnToolbox model was successfully applied, and a process for evaluating the long-term operation of structural BMPnsites was established.