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<td>Bioretention</td> | <td>Bioretention</td> | ||
− | <td>Should be constructed with an underdrain if minimum separation distance of three feet is not present between practice bottom and bedrock.</td> | + | <td>Should be constructed with an underdrain or liner if minimum separation distance of three (3) feet is not present between practice bottom and bedrock.<sup>1</sup></td> |
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*Recommended practice in areas of shallow bedrock and soil. | *Recommended practice in areas of shallow bedrock and soil. | ||
− | *Dry swales with engineered soil media will need | + | *Dry swales with engineered soil media will need an underdrain if minimum separation distance of three (3) feet is not present between bottom of practice and bedrock</td> |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>Infiltration trench or basin</td> | <td>Infiltration trench or basin</td> | ||
− | <td>*Will be limited due to minimum separation requirement. Surface area to depth ratios of practices may need to be larger. Arch pipe and other perforated storage "vault" practices can help increase treatment volumes within limited spaces. | + | <td> |
+ | *Will be limited due to minimum separation requirement. Surface area to depth ratios of practices may need to be larger. Arch pipe and other perforated storage "vault" practices can help increase treatment volumes within limited spaces. | ||
*If used, should have supporting geotechnical investigations and calculations | *If used, should have supporting geotechnical investigations and calculations | ||
− | *Use with PSHs should be carefully considered. Pre-treatment should be extensive to limit risk of groundwater contamination if groundwater is close to the land surface | + | *Use with [http://stormwater.pca.state.mn.us/index.php/Potential_stormwater_hotspots PSHs] should be carefully considered. Pre-treatment should be extensive to limit risk of groundwater contamination if groundwater is close to the land surface. |
*Local review authority should be consulted for approval</td> | *Local review authority should be consulted for approval</td> | ||
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+ | <font size=1><sup>1</sup>A liner is required under the [http://stormwater.pca.state.mn.us/index.php/Construction_stormwater_permit Construction Stormwater General Permit]</font size>. | ||
− | <noinclude>[[ | + | <noinclude> |
+ | [[Category:Level 3 - General information, reference, tables, images, and archives/Tables/General bmp information]] | ||
+ | </noinclude> |
Recommendations for structural BMP use in settings with shallow soils and shallow depth to bedrock.
Link to this table
BMP | Shallow soil and shallow depth to bedrock considerations |
---|---|
Bioretention | Should be constructed with an underdrain or liner if minimum separation distance of three (3) feet is not present between practice bottom and bedrock.1 |
Media filter |
|
Vegetative filter |
|
Infiltration trench or basin |
|
Stormwater ponds |
|
Constructed wetlands |
|
1A liner is required under the Construction Stormwater General Permit.
This page was last edited on 4 August 2022, at 20:04.