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<tr>
 
<tr>
 
<th>BMP Design</th>
 
<th>BMP Design</th>
<th>Bioretention are preferred practices</th>
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<th>Design recommendations</th>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Bioretention</td>
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices Infiltration]</td>
<td>Bioretention are preferred practices</td>
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<td>
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*[https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices Infiltration BMPs are preferred practices]
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*Provide a minimum 3-foot separation from the seasonally-high water table, bedrock or impervious soil layer</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Filtration</td>
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Stormwater_filtration_Best_Management_Practices Filtration] (includes practices with an [https://stormwater.pca.state.mn.us/index.php?title=Glossary#U underdrain])</td>
 
<td>
 
<td>
*Organic filters are a source of soluble phosphorus and should not be used.
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*Organic filters are a source of soluble phosphorus and should not be used
*Employ finer-grained media in the filter bed with a small diameter (15 microns), or provide a finer-grained layer at mid-depth in the filter profile.
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*Practices with engineered media are acceptable when the appropriate [[Design criteria for bioretention#Materials specifications - filter media|filter media]] is used
*The process for pre-treatment and/or filtration should extend from 36 to 48 hours, where possible.
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*Employ finer-grained media in the filter bed with a small diameter (15 microns), or provide a finer-grained layer at mid-depth in the filter profile
*Filters should be oriented to provide maximum solar exposure.
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*The process for [[Pretreatment|pretreatment]] and/or filtration should extend from 36 to 48 hours, where possible
*Wet swales are not recommended.
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*Filters should be oriented to provide maximum solar exposure
*Open channels should be designed to be either self-cleansing or promote maximum sediment retention.
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*[https://stormwater.pca.state.mn.us/index.php?title=Wet_swale_(wetland_channel) Wet swales] are not recommended because they may export phosphorus
*Open channels should not be relied on as the only BMP to remove phosphorus at a site, with the exception of an engineered dry swale.</td>
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*Open channels should be designed to promote maximum sediment retention</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Stormwater Ponds</td>
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<td>[[Stormwater ponds]]<sup>1</sup></td>
 
<td>
 
<td>
*Design wet ponds with a depth no greater than 10 feet to prevent stratification and potential release of phosphorus from bottom sediments.
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*Pond aeration is encouraged
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*Design wet ponds with a depth no greater than 10 feet to prevent stratification and potential release of phosphorus from bottom sediments
 
*Avoid the use of dry or dry extended detention ponds
 
*Avoid the use of dry or dry extended detention ponds
 
*Designers should consider the snowmelt runoff volume and design ponds for seasonal operation
 
*Designers should consider the snowmelt runoff volume and design ponds for seasonal operation
*Use a surface or mid-depth release from the pond.
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*Use a surface or mid-depth release from the pond
*Landscape pond to discourage geese.
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*Landscape pond to discourage geese
*Add shallow benches and wetland areas to enhance the plankton community.
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*Add shallow benches and wetland areas to enhance the plankton community
*Follow mosquito advisories in Chapter 6.</td>
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*Pond sediments may be amended to retain phosphorus (e.g. iron, aluminum)
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</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Constructed Stormwater Wetlands</td>
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<td>Constructed [[Stormwater wetlands]]</td>
 
<td>
 
<td>
*Pond/ wetland system is the preferred wetland design.
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*Pond/ wetland system is the preferred wetland design
*Use a surface or mid-depth release from the wetland.
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*Use a surface or mid-depth release from the wetland
*Maximize surface micro-topography.
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*Maximize surface micro-topography
*Landscape wetland to discourage geese.
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*Landscape wetland to discourage geese
*Follow mosquito advisories in Chapter 6.</td>
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</td>
</tr>
 
<tr>
 
<td>Infiltration</td>
 
<td>
 
*Infiltration BMPs are preferred practices.
 
*Provide a minimum 3-foot separation from the seasonally-high water table, bedrock or impervious soil layer.</td>
 
 
</tr>
 
</tr>
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</table>
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<font size=1><sup>1</sup>The recommendations for constructed ponds are from the original Minnesota Stormwater Manual. MPCA anticipates updating this information in the near future.</font size>
  
</table>
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<noinclude>
[[category:table]]
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[[Category:Level 3 - General information, reference, tables, images, and archives/Tables/Pollutant removal]]
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[[Category:Level 2 - Pollutants/Phosphorus]]
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[[Category:Level 3 - Best management practices/Specifications and details/Design criteria]]
 +
</noinclude>

Latest revision as of 11:58, 7 August 2022

Summary of stormwater design recommendations to enhance phosphorus removal.
Link to this table

BMP Design Design recommendations
Infiltration
Filtration (includes practices with an underdrain)
  • Organic filters are a source of soluble phosphorus and should not be used
  • Practices with engineered media are acceptable when the appropriate filter media is used
  • Employ finer-grained media in the filter bed with a small diameter (15 microns), or provide a finer-grained layer at mid-depth in the filter profile
  • The process for pretreatment and/or filtration should extend from 36 to 48 hours, where possible
  • Filters should be oriented to provide maximum solar exposure
  • Wet swales are not recommended because they may export phosphorus
  • Open channels should be designed to promote maximum sediment retention
Stormwater ponds1
  • Pond aeration is encouraged
  • Design wet ponds with a depth no greater than 10 feet to prevent stratification and potential release of phosphorus from bottom sediments
  • Avoid the use of dry or dry extended detention ponds
  • Designers should consider the snowmelt runoff volume and design ponds for seasonal operation
  • Use a surface or mid-depth release from the pond
  • Landscape pond to discourage geese
  • Add shallow benches and wetland areas to enhance the plankton community
  • Pond sediments may be amended to retain phosphorus (e.g. iron, aluminum)
Constructed Stormwater wetlands
  • Pond/ wetland system is the preferred wetland design
  • Use a surface or mid-depth release from the wetland
  • Maximize surface micro-topography
  • Landscape wetland to discourage geese

1The recommendations for constructed ponds are from the original Minnesota Stormwater Manual. MPCA anticipates updating this information in the near future.

This page was last edited on 7 August 2022, at 11:58.