Changes

|''q''||mm/hr||Infiltration coefficient, calculated from measured [[Infiltration: Testing| infiltration rate]] and applied [[Infiltration|safety factor]]

|''q''||mm/hr||Infiltration coefficient, calculated from measured [[Infiltration: Testing| infiltration rate]] and applied [[Infiltration|safety factor]]

|-

|-

|''n''||-||Porosity, as measured (or default to 0.35)

|''n''||-||Porosity, as measured (or default to 0.35). *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 applied to these calculations. The effective porosity will vary according to the geometry of the storage chambers and advice should be sought from product manufacturers. Permit applications should include information which has been used as the basis for such calculations.

|-

|-

|''I''||m²||Impermeable area i.e. catchment

|''I''||m²||Impermeable area i.e. catchment

The following equations assume that infiltration occurs primarily through the base of the facility.  

The following equations assume that infiltration occurs primarily through the base of the facility.  

They may be easily applied for any shape and size of infiltration facility, in which the reservoir storage is mostly in an aggregate.

They may be easily applied for any shape and size of infiltration facility, in which the reservoir storage is mostly in an aggregate.   

* Note: For systems that have significant storage in clear open chambers, an effective porosity value (''n''') may be estimated for the whole installation and applied to these calculations. The effective porosity will vary according to the geometry of the storage chambers and advice should be sought from product manufacturers. Permit applications should include information which has been used to calculate ''n'''.   

To calculate the required depth, where the area of the facility is constrained:

To calculate the required depth, where the area of the facility is constrained: