Stormwater filtration practice (grass filters/swales) outflow concentrations and pollutant removals.
Link to this table
| Source | TSS outflow concentration (mg/L) at a given Percentile | TP outflow concentration (mg/L) at a given Percentile | ||||
|---|---|---|---|---|---|---|
| 25th | 50th | 75th | 25th | 50th | 75th | |
| ASCE/EPA | 18 | 26 | 53 | 0.19 | 0.29 | 0.46 |
| CWP | 8 | 14 | 35 | 0.11 | 0.19 | 0.26 |
| Source | TSS Percent Removal at a given Percentile1 | TP Percent Removal at a given Percentile1 | ||||
| 25th | 50th | 75th | 25th | 50th | 75th | |
| ASCE/EPA | 8 | 54 | 70 | -121 | -35 | 15 |
| CWP | 70 | 81 | 86 | 19 | 34 | 54 |
1MnDOT values for mean TSS removal=68% and mean TP removal=41%