Changes

|''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, 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.

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|''I''||m²||Impermeable area within the catchment

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

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|''d''||m||Depth of the infiltration BMP, total of all components

|''d''||m||Depth of the infiltration BMP, total of all components