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→Constraints
Infiltration facilities should be designed with drainage modifications where:
Infiltration facilities should be designed with drainage modifications where:
#the underlying bedrock is within 1 m below the bottom of the proposed BMP, or
#the underlying bedrock is within 1 m below the bottom of the proposed BMP, or
#the seasonal high groundwater level comes within 1 m below the bottom of the proposed BMP.
#the seasonal high groundwater level (i.e. water table) comes within 1 m below the bottom of the proposed BMP.
===Designing with constraints===
===Designing with constraints===
{{textbox|Infiltration can still be optimized over 'tight' soils with infiltration rates ≤ 15 mm/hr:
{{textbox|Infiltration can still be optimized over 'tight' soils with infiltration rates ≤ 15 mm/hr: