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→Key system design parameters
===Sizing===
===Sizing===
When sizing filtration systems for specific sites using local historical rainfall records, several key system design parameters need to be considered. These are defined in the sizing section of the [[Filtration MTD]] page.
When sizing filtration systems for specific sites using local historical [[Understanding rainfall statistics|rainfall]] records, several key system design parameters need to be considered. These are defined in the sizing section of the [[Filtration MTD]] page.
Non-proprietary [[bioretention]] systems are sized as filters much more conservatively based on design storms, surface ponding depth and [[Flow through media|minimum media infiltration rate]]. The ratio of drainage area imperviousness to the surface area of bioretention facilities (referred to as the impervious-to-pervious ratio) is often many times lower than that for filtration MTDs. This ensures longer intervals for sediment maintenance and significant reductions in stormwater volumes through infiltration.
Non-proprietary [[bioretention]] systems are sized as filters much more conservatively based on design storms, surface ponding depth and [[Flow through media|minimum media infiltration rate]]. The ratio of drainage area imperviousness to the surface area of bioretention facilities (referred to as the impervious-to-pervious ratio) is often many times lower than that for filtration MTDs. This ensures longer intervals for sediment maintenance and significant reductions in stormwater volumes through infiltration.
[[File:Screenshot 2025-07-14 135310.png|300px|thumb|right|Filter media replacement in bioretention system (Filterra®)<ref>filterra-vault-om.pdf</ref>]]
[[File:Screenshot 2025-07-14 135310.png|300px|thumb|right|Filter media replacement in bioretention system (Filterra®)<ref>filterra-vault-om.pdf</ref>]]
==Maintenance considerations==
==Maintenance considerations==
[[File:MaintenancePICP.png|thumb|300px|Vehicle used for vacuum maintenance of permeable pavements (Source: STEP). ]]
[[File:MaintenancePICP.png|thumb|300px|Vehicle used for vacuum maintenance of permeable pavements (Source: STEP). ]]