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<td>Maintain permanent pool in constructed ponds in areas underlain by geologic material that is fractured or has a high infiltration rate</td>
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<td>Maintain permanent pool in constructed ponds or constructed wetlands in areas underlain by geologic material that is fractured or has a high infiltration rate</td>
 
<td>2</td>
 
<td>2</td>
 
<td></td>
 
<td></td>

Revision as of 21:04, 2 December 2015

Design process for selecting the appropriate liner level.
Link to this table

Condition Design level Note
Filtration BMP with less than 3 feet of separation to seasonal saturated soil or bedrock 1 Required under the Construction Stormwater permit
BMP in confirmed potential stormwater hotspot with high or very high groundwater pollution potential 1 Applies to all post-construction BMPs. See section on Potential stormwater hotspots for more information
Constructed ponds with less than 3 feet separation from seasonally high water table in a potential hotspot 1
Karst terrain with high or very high groundwater pollution potential 1 See section on karst for more information
Prevent groundwater intrusion into a BMP requiring aerobic conditions, such as iron-enhanced media 1
Maintain permanent pool in constructed ponds or constructed wetlands in areas underlain by geologic material that is fractured or has a high infiltration rate 2
Separation distance from a BMP cannot be achieved 2
Separate tree BMP from road, parking lot, sidewalk or adjacent walls or building foundation 2 To prevent tree root intrusion. See link