Long-Term Performance and Life-Cycle Costs of Stormwater Best Management Practices (2014) / Chapter Skim
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Pages 43-54
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From page 43... ...
43 C H a P T E r 4 Long-term BMP performance represents the average annual performance over the life of the BMP, which depends greatly on various BMP unit treatment processes. Pollutant removal mechanisms in BMPs are based on unit operations and processes (UOPs)
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44 • TSS • Fecal coliform (FC) • Escherichia coli (E.
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45 underestimate of pollutant loads when data are skewed to the right (typical of water quality data)
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46 Constituent Medians (90% Confidence Intervals) by AADT Bin 0–25k 25k–50k 50k–100k 100k+ Unknown All TSS 42.05 61.49 69.07 100.2 39.64 69.2 (mg/L)
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47 except for possibly TSS, total phosphorus, total copper, and total zinc, particularly when comparing the low traffic AADT (<25k) against the high traffic AADT (>50k)
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48 was needed for the Spearman's rho computation because the correlation analysis uses the ranks of the data. If the Wilcoxon test found a statistically significant difference between the influent and effluent concentrations, and the Spearman's rho test found that a monotonic relationship exists, regression equations were developed using the KendallTheil robust line procedure described by Granato (2006)
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49 Pollutant Spearman's Rho p-values by BMP Type (Bold values indicate statistically significant influent/effluent correlation.) Bioretention Grass Swale Filter Strip Wet Pond Detention Basin Sand Filter PFC TSS 0.30 (<0.001)
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50 4.4 Influent Highway Runoff Water Quality Methods Influent highway runoff concentrations are calculated as described in Section 4.3.1 and are shown in the rightmost column of Table 4-6. Tool users have the option of overriding this default with a value from the table or from other monitoring data.
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51 Pollutant A B C D E ei DL TSS (mg/L)
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52 Pollutant A B C D E ei DL TSS (mg/L)
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53 indicate the parameters for predicting effluent concentrations for each BMP. The regression equations are used to represent the average performance for each BMP type, not event-by-event concentrations.
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54 Figure 4-3. Bioretention regression line for total zinc.
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