Changes

|''f'''||mm/hr||Design infiltration rate of the underlying native soil, calculated from measured [[Infiltration: Testing| infiltration rate]] and applied [[Infiltration|safety factor]]

|''f'''||mm/hr||Design infiltration rate of the underlying native soil, calculated from measured [[Infiltration: Testing| infiltration rate]] and applied [[Infiltration|safety factor]]

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|''n''||-||Porosity, depth-weighted mean of all fill materials.<br> *Note: For systems that have significant storage in clear open chambers, an effective porosity value (''n<nowiki>'</nowiki>'') may be estimated for the whole installation and used in the calculations below. Effective porosity will vary according to the geometry of the storage chambers, so advice should be sought from product manufacturers. Permit applications should include the basis for ''n<nowiki>'</nowiki>'' estimates.

|''n''||-||Porosity of the aggregate or other void producing fill material.<br> *Note: For systems that have significant storage in clear open chambers surrounded by clear stone aggregate, an effective porosity value (''n<nowiki>'</nowiki>'') may be estimated for the whole installation and used in the calculations below. Effective porosity will vary according to the geometry of the storage chambers, so advice should be sought from product manufacturers. Permit applications should include the basis for ''n<nowiki>'</nowiki>'' estimates.

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|''A<sub>i''||m²||Impermeable area within the catchment

|''A<sub>i''||m²||Impermeable area within the catchment

|''x''||m||Perimeter of the practice

|''x''||m||Perimeter of the practice

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|''K''||mm/hr||Saturated hydraulic conductivity of the filter media or fill used in the practice   

|''K''||mm/hr||Hydraulic conductivity of the filter media or fill used in the practice   

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