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| ==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, |
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| ===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]] |
| }} | | }} |