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− | <center><font size=3>''' | + | <center><font size=3>'''This table shows structural BMP use in settings with shallow soils and shallow depth to bedrock.'''</font size><br> |
Link to this [[BMP use in settings with shallow soils and shallow depth to bedrock|table]]</center> | Link to this [[BMP use in settings with shallow soils and shallow depth to bedrock|table]]</center> | ||
<table class="sortable"> | <table class="sortable"> | ||
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<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. | + | <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. | + | *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 |
*Local review authority should be consulted for approval</td> | *Local review authority should be consulted for approval</td> | ||
</tr> | </tr> | ||
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</tr> | </tr> | ||
</table> | </table> | ||
+ | [[category:table]] |
BMP | Shallow soil and shallow depth to bedrock considerations |
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Bioretention | Should be constructed with an underdrain if minimum separation distance of three feet is not present between practice bottom and bedrock. |
Media filter |
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Vegetative filter |
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Infiltration trench or basin | *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.
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Stormwater ponds |
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Constructed wetlands |
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