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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>Filtration</td>
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<td>[https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices Infiltration]</td>
 
<td>
 
<td>
*Organic filters are a source of soluble phosphorus and should not be used.
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*[https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices Infiltration BMPs are preferred practices]
*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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*Provide a minimum 3-foot separation from the seasonally-high water table, bedrock or impervious soil layer</td>
*The process for pre-treatment 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.
 
*Open channels should be designed to be either self-cleansing or promote maximum sediment retention.
 
*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>
 
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Stormwater Ponds</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>
*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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*Organic filters are a source of soluble phosphorus and should not be used
*Avoid the use of dry or dry extended detention ponds
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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
*Designers should consider the snowmelt runoff volume and design ponds for seasonal operation
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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
*Use a surface or mid-depth release from the pond.
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*The process for [[Pretreatment|pretreatment]] and/or filtration should extend from 36 to 48 hours, where possible
*Landscape pond to discourage geese.
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*Filters should be oriented to provide maximum solar exposure
*Add shallow benches and wetland areas to enhance the plankton community.
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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
*Follow mosquito advisories in Chapter 6.</td>
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*Open channels should be designed to promote maximum sediment retention</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Constructed Stormwater Wetlands</td>
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<td>[[Stormwater ponds]]<sup>1</sup></td>
 
<td>
 
<td>
*Pond/ wetland system is the preferred wetland design.
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*Pond aeration is encouraged
*Use a surface or mid-depth release from the wetland.
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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
*Maximize surface micro-topography.
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*Avoid the use of dry or dry extended detention ponds
*Landscape wetland to discourage geese.
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*Designers should consider the snowmelt runoff volume and design ponds for seasonal operation
*Follow mosquito advisories in Chapter 6.</td>
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*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)
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</td>
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Infiltration</td>
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<td>Constructed [[Stormwater wetlands]]</td>
 
<td>
 
<td>
*Infiltration BMPs are preferred practices.
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*Pond/ wetland system is the preferred wetland design
*Provide a minimum 3-foot separation from the seasonally-high water table, bedrock or impervious soil layer.</td>
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*Use a surface or mid-depth release from the wetland
 +
*Maximize surface micro-topography
 +
*Landscape wetland to discourage geese
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</td>
 
</tr>
 
</tr>
 +
</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]]
 +
[[Category:Level 2 - Pollutants/Phosphorus]]
 +
[[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.