Changes

==Constraints==

==Constraints==

Infiltration practices are not recommended:

Infiltration practices are not recommended:

#over swelling clays or unstable sub-soils,

#over-swelling clays or unstable sub-soils,

#over contaminated soils or sites with high risk of contamination from onsite activities,  

#contaminated soils or sites with high risk of contamination from onsite activities,  

#in flood prone areas where the wastewater system is sensitive to groundwater conditions causing sewer backups, and where LID BMPs have been found to be ineffective,

#in flood prone areas where the wastewater system is sensitive to groundwater conditions causing sewer backups, and where LID BMPs have been found to be ineffective,

#in areas where the ecology and natural hydrology are dependent upon surface water,

#in areas where the ecology and natural hydrology are dependent upon surface water,

===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:

*See [[Underdrains]] for [[Bioretention]] and [[tree pits]], and  

*See [[Underdrains]] for [[Bioretention]] and [[trees|tree pits]], and  

*Results from STEP studies over [[low permeability soils]]

*Results from STEP studies over [[low permeability soils]]

}}

}}

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==See also==

==See also==

[[Groundwater]]

*[[Groundwater]]

 

[[category:Infiltration]]

[[category:Infiltration]]