Difference between revisions of "Comparative BMP phosphorus removal"
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<td>Vegetative Filters (dry)</td> | <td>Vegetative Filters (dry)</td> | ||
| − | <td> | + | <td>50</td> |
<td>55</td> | <td>55</td> | ||
<td>0</td> | <td>0</td> | ||
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<td>Wet Swale</td> | <td>Wet Swale</td> | ||
<td>0</td> | <td>0</td> | ||
| − | <td> | + | <td>35</td> |
<td>0</td> | <td>0</td> | ||
</tr> | </tr> | ||
Revision as of 22:28, 16 June 2014
General summary of comparative BMP phosphorus removal performancea,e,f
Link to this table
| BMP Group | BMP Design Variation | Average TP Removal Rate (%)b | Maximum TP Removal Rate (%)c | Average Soluble P Removal Rate (%)dg |
|---|---|---|---|---|
| Bioretention | Underdrain | see Phosphorus credits for bioretention systems with an underdrain | see Phosphorus credits for bioretention systems with an underdrain | see Phosphorus credits for bioretention systems with an underdrain |
| Infiltration |
|
|
|
|
| Filtration | Media Filter | 50 | 55 | 0 |
| Vegetative Filters (dry) | 50 | 55 | 0 | |
| Wet Swale | 0 | 35 | 0 | |
| Infiltrationf,i | Infiltration Trench |
|
|
|
| Infiltration Basin |
|
|
|
|
| Stormwater Ponds | Wet Pond | 50 | 75 | 0 |
| Multiple Pond | 60 | 75 | 0 | |
| Stormwater Wetlands | Shallow Wetland | 40 | 55 | 0 |
| Pond/Wetland | 55 | 75 | 0 |
a Removal rates shown in table are a composite of five sources: ASCE/EPA International BMP Database;Caraco (CWP), 2001; MDE, 2000; Winer (CWP), 2000; and Issue Paper D P8 modeling
b Average removal efficiency expected under MPCA Construction General Permit sizing requirements
c Upper limit on phosphorus removal with increased sizing and design features, based on national review
d Average rate of soluble phosphorus removal in literature
e See also Calculating stormwater volume and pollutant reductions and credits
f Note that the performance numbers apply only to that portion of total flow actually being treated; it does not include any runoff that by-passes the BMP
g Note that soluble P can transfer from surface water to ground water, but this column refers only to surface water
h Note that 100% is assumed for all infiltration, but only for that portion of the flow fully treated in theinfiltration facility; by-passed runoff or runoff diverted via underdrain does not receive this level of treatment