m
m
Line 8: Line 8:
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Infiltration</td>
+
<td>[https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices Infiltration]</td>
 
<td>
 
<td>
*Infiltration BMPs are preferred practices
+
*https://stormwater.pca.state.mn.us/index.php?title=Stormwater_infiltration_Best_Management_Practices Infiltration BMPs are preferred practices
 
*Provide a minimum 3-foot separation from the seasonally-high water table, bedrock or impervious soil layer</td>
 
*Provide a minimum 3-foot separation from the seasonally-high water table, bedrock or impervious soil layer</td>
 
</tr>
 
</tr>
Line 25: Line 25:
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Stormwater Ponds<sup>1</sup></td>
+
<td>[[Stormwater ponds]]<sup>1</sup></td>
 
<td>
 
<td>
 
*Pond aeration is encouraged
 
*Pond aeration is encouraged
Line 38: Line 38:
 
</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Constructed Stormwater Wetlands</td>
+
<td>Constructed [[Stormwater wetlands]]</td>
 
<td>
 
<td>
 
*Pond/ wetland system is the preferred wetland design
 
*Pond/ wetland system is the preferred wetland design

Revision as of 15:59, 22 May 2018

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.