m |
m |
||
Line 33: | Line 33: | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
− | <td colspan=7><sup>1</sup> For example, sand, mixed sand/peat and other geologic media | + | <td colspan=7> |
+ | |||
+ | <sup>1</sup> For example, sand, mixed sand/peat and other geologic media | ||
+ | |||
<sup>2</sup> Grass filter/swale | <sup>2</sup> Grass filter/swale | ||
+ | |||
<sup>3</sup> See Appendix N discussion | <sup>3</sup> See Appendix N discussion | ||
− | <sup>4</sup> Not enough information given in databases to differentiate | + | |
+ | <sup>4</sup> Not enough information given in databases to differentiate ype of filter so both combined for this entry</td> | ||
</tr> | </tr> | ||
</table> | </table> |
Pollutant Removal Percentages for Filtration BMPs (Source: ASCE International BMP Database (ww.bmpdatabase.org) and Winer (CWP), 2000 (see also Appenidx N) | ||||||
---|---|---|---|---|---|---|
Practice | TSS High-Med-Low3 | TP High-Med-Low3 | TN4 | Metals4 (average of Zn and Cu) | Bacteria4 | Hydrocarbons4 |
Media Filter1 | 75-85-90 | 30-50-55 | 35 | 80 | 35 | 80 |
Vegetative Filter2 | 40-70-80 | (-)51-0-35 | 35 | 80 | 35 | 80 |
1 For example, sand, mixed sand/peat and other geologic media 2 Grass filter/swale 3 See Appendix N discussion 4 Not enough information given in databases to differentiate ype of filter so both combined for this entry |