m
m
Line 6: Line 6:
 
<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>d,f,g</sup></th>
+
<th>Average soluble P removal rate (%)<sup>d,f,g</sup></th>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
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<td>50</td>
 
<td>50</td>
 
<td>65</td>
 
<td>65</td>
<td>60</td>
+
<td>0</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>

Revision as of 21:23, 13 May 2013

This table shows comparison of phosphorus removal for different BMPs.a,e,f Values represent the percent of incoming pollutant that is removed. Source: MPCA Minnesota Stormwater Manual.
Link to this table

Information: 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.
BMP group BMP design variation Average TP removal rate (%)b Maximum TP removal rate (%)c Average soluble P removal rate (%)d,f,g
Bioretentionf Underdrain 50 65 0
Infiltration 100 100 100
Filtration Sand filter 50 55 0
Dry swale 0 55 0
Wet swale 65 75 70
Infiltrationf Infiltration trench 100 100 100
Infiltration basin 100 100 100
Stormwater ponds Wet pond 50 65 0
Multiple pond 60 75 0
Stormwater wetlands Shallow wetland 40 55 0
Pond/wetland 55 75 0

aRemoval rates show in table are a composite of five sources:

  • Caraco (Center for Watershed protection, 2001)
  • Maryland Department of the Environment](2000)
  • Winer (Center for Watershed Protection, 2000)
  • P8 modeling (William Walker)

b Average removal efficiency expected under MPCA 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 the literature
e See section on calculating credits for each BMP in this Manual.
f Note that the performance numbers apply only to that portion of total flow actually being treated; it does not include any runoff that bypasses the BMP
gNote that soluble P can transfer from surface water to groundwater, but this column refers only to surface water
hNote that 100% is assumed for all infiltration, but only for that portion of the flow fully treated in the infiltration facility; by-passed runoff or runoff diverted via underdrain does not receive this level of treatment.