m
m
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<td>
 
<td>
 
*100 for water that is infiltrated
 
*100 for water that is infiltrated
*25 for water that passes through an underdrain<sup>3</sup>
+
*see [http://stormwater.pca.state.mn.us/index.php/Calculating_credits_for_tree_trenches_and_tree_boxes#Phosphorus_credit_for_non-volume_reduction] for water that passes through an underdrain
 
*0 for water bypassing the bioretention BMP</td>
 
*0 for water bypassing the bioretention BMP</td>
 
<td>50</td>
 
<td>50</td>
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<font size=1><sup>1</sup> Average of zinc and copper<br>
 
<font size=1><sup>1</sup> Average of zinc and copper<br>
 
<sup>2</sup> Assumed values based on filtering practice performance<br>
 
<sup>2</sup> Assumed values based on filtering practice performance<br>
<sup>3</sup>From the Minimal Impact Design Standards (MIDS) calculator, which assumes phosphorus in runoff is 55 percent particulate, 45 percent dissolved, and that removal efficiency is 45 percent for particulate fraction and 0 percent for dissolved fraction.</font size>
+
</font size>
  
 
<noinclude>[[category:table]]</noinclude>
 
<noinclude>[[category:table]]</noinclude>

Revision as of 22:16, 16 January 2014

Pollutant removal percentages for bioretention BMPs. Source Winer, 2000.
Link to this table

Practice TSS Total Phosphorus Total nitrogen Metals1 Bacteria Hydrocarbons
Bioretention1 852
  • 100 for water that is infiltrated
  • see [1] for water that passes through an underdrain
  • 0 for water bypassing the bioretention BMP
50 95 352 80

1 Average of zinc and copper
2 Assumed values based on filtering practice performance