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Revision as of 13:32, 19 August 2013

Considerations for structural BMP use in karst settings.
Link to this table

BMP Karst considerations
Bioretention If containment levels remain high after treatment or if water inflow presents a threat, an underdrain and-or use of a synthetic or other impermeable membrane liner should be considered to seal the bottom of the system.
Media filter If containment levels remain high after treatment or if water inflow presents a threat, an underdrain and-or use of a synthetic or other impermeable membrane liner should be considered to seal the bottom of the system.
Vegetative filter
  • Avoid water ponding
  • Should be engineered to avoid channel erosion and optimize pollutant removal
Infiltration trench or basin
  • Not typically recommended in active karst areas due to sinkhole formation and inadequate treatment by a scarcity of underlying soils
  • If used, should have supporting geotechnical investigations and calculations
  • Pre-treatment should be extensive to limit risk of groundwater contamination
  • Local review authority should be consulted for approval
Stormwater ponds
  • Should be constructed with a synthetic or clay liner in active karst areas
  • Should have supporting geotechnical investigations and calculations
  • Should be limited to a maximum ponding depth (e.g. < 10 feet)
Constructed wetlands
  • Should be constructed with a synthetic or clay liner in active karst areas
  • Should have supporting geotechnical investigations and calculations
  • Should be limited to a maximum ponding depth (e.g. < 10 feet)