Climate, soil, terrain factors affecting BMP selection Climate, soil, terrain factors affecting BMP selection

This table shows the summary of climate, soil and terrain factors that affect the selection of Best Management Practices.
Link to this table

BMP	Karst	Bedrock and shallow soils	High snowfall - meltwater treatment	Low rainfall
Bioretention - no underdrain	Not recommended. Extensive pre-treatment required	Not recommended due to separation distance	OK. Use salt-tolerant vegetationand pre-treatment. Chlorides will move through untreated.	OK. Use appropriate vegetation.
Bioretention with underdrain	OK. Under certain conditions use impermeable liner	Recommended.	OK. Use salt-tolerant vegetationand pre-treatment. Chlorides will move through untreated.	OK. Use appropriate vegetation.
Filtrationa	OK. Under certain conditions use impermeable liner	Recommended	OK. Place below frost line. Use pre-treatment. Chlorides will move through untreated.	Recommended.
Infiltrationb	Not recommended. Extensive pre-treatment required	Not recommended due to separation distance	OK but could be limited. Active management needed to prevent infiltration of chlorides and soluble toxics.	Recommended
Stormwater ponds	OK. Under certain conditions use impermeable liner; limit depth; geotechnical investigation needed.	Limited due to available depth and large surface area requirement.	Recommended. Limit depth to avoid stratification. Adapt outlet structure.	Limited. Water budget calculations may show this to be unsuitable.
Constructed wetlands	OK. Under certain conditions use impermeable liner; limit depth; geotechnical investigation needed.	OK. Large surface area.	OK. Use salt-tolerant vegetation.	Limited. Water budget calculations may show this to be unsuitable.

^aSee sand filters, Dry swale (Grass swale), High-gradient stormwater step-pool swale, or Wet swale (wetland channel)
^bSee infiltration trench or infiltration basin