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m
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</tr>
 
</tr>
 
<tr>
 
<tr>
<td>Constructed wet ponds underlain by soils with an infiltration rate of 0.3 inches per hour or greater (HSG A or B soils)(see [http://tnpermanentstormwater.org/manual/10%20Chapter%205.4.2%20Wet%20Ponds.pdf] or [http://dnr.wi.gov/topic/stormwater/documents/wetpondstd1001.pdf]</td>
+
<td>Constructed wet ponds underlain by soils with an infiltration rate of 0.3 inches per hour or greater (HSG A or B soils)(see [http://tnpermanentstormwater.org/manual/10%20Chapter%205.4.2%20Wet%20Ponds.pdf] or [http://dnr.wi.gov/topic/stormwater/documents/wetpondstd1001.pdf])</td>
 
<td>1</td>
 
<td>1</td>
 
<td>To maintain a permanent pool</td>
 
<td>To maintain a permanent pool</td>

Revision as of 19:35, 5 September 2017

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
Constructed wet ponds underlain by soils with an infiltration rate of 0.3 inches per hour or greater (HSG A or B soils)(see [1] or [2]) 1 To maintain a permanent pool
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