This table shows structural BMP use in soil with low infiltration capacity
Link to this table

BMP Low infiltration capacity soil considerations
Bioretention, dry swale, permeable pavement, tree trench/box Should be constructed with an underdrain. Recharge criteria, if applicable, can be met by modifying the design to include an infiltration gallery below the underdrain, so long as it is appropriately sized.
Media filter Recommended practice in tight soils. Some design variants can be modified to incorporate an infiltration gallery that can help meet recharge criteria, if properly sized.
Infiltration trench or basin
  • Not recommended as a practice
  • Soils analysis should be conducted to confirm limiting aspects of soil profile
Stormwater ponds Acceptable practice with tight soils. Soils should help maintain permanent pool.
Constructed wetlands
  • Acceptable practice with tight soils. Soils should help maintain permanent pool if practice is not tied into groundwater table.
  • Compost amendments may be necessary to establish suitable planting beds

This page was last edited on 25 September 2015, at 19:36.

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