m
m
Line 5: Line 5:
 
<th>BMP Group</th>
 
<th>BMP Group</th>
 
<th>BMP Design Variation</th>
 
<th>BMP Design Variation</th>
<th>Average TP Removal Rate<sup>b</sup></th>
+
<th>Average TP Removal Rate (%)<sup>b</sup></th>
<th>Maximum TP Removal Rate<sup>c</sup></th>
+
<th>Maximum TP Removal Rate (%)<sup>c</sup></th>
<th>Average Soluble P Removal Rate<sup>dg</sup></th>
+
<th>Average Soluble P Removal Rate (%)<sup>dg</sup></th>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
 
<td Rowspan="2">Bioretention</td>
 
<td Rowspan="2">Bioretention</td>
 
<td>Underdrain</td>
 
<td>Underdrain</td>
<td>50%</td>
+
<td>50</td>
<td>65%</td>
+
<td>65</td>
<td>60%</td>
+
<td>0</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
Line 59: Line 59:
 
<td>50</td>
 
<td>50</td>
 
<td>75</td>
 
<td>75</td>
<td>70</td>
+
<td>0</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
Line 65: Line 65:
 
<td>60</td>
 
<td>60</td>
 
<td>75</td>
 
<td>75</td>
<td>75</td>
+
<td>0</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
Line 72: Line 72:
 
<td>40</td>
 
<td>40</td>
 
<td>55</td>
 
<td>55</td>
<td>50</td>
+
<td>0</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
Line 78: Line 78:
 
<td>55</td>
 
<td>55</td>
 
<td>75</td>
 
<td>75</td>
<td>65</td>
+
<td>0</td>
 
</tr>
 
</tr>
 
</table>
 
</table>

Revision as of 13:13, 13 May 2013

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 50 65 0
Infiltration 100 100 100
Filtration Media Filter 50 55 0
Vegetative Filters (dry) 0 55 0
Wet Swale 0 40 0
Infiltrationf,i Infiltration Trench 100 100 100
Infiltration Basin 100 100 100
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 Rules 1 and 3
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

Caution: Removal rates shown here are composite averages intended solely for use in comparing performance between BMP designs and for use in calculating load reduction in site-based TP models. They have been adapted, rounded and slightly discounted from statistical values published in BMP performance databases.