Changes

* Native soil infiltration rates for Full, and Partial Infiltration Design scenarios were assumed to be 20 mm/h and 10 mm/h respectively, and a safety factor of 2.5 was applied to calculate the design infiltration rate.  

* Native soil infiltration rates for Full, and Partial Infiltration Design scenarios were assumed to be 20 mm/h and 10 mm/h respectively, and a safety factor of 2.5 was applied to calculate the design infiltration rate.  

* Operation and maintenance (O&M) cost estimates assume annual inspections, removal of trash and debris twice a year, and removal of sediment from pretreatment structures annually. Verification inspections are included every 5 years to confirm adequate maintenance, and every 15 years to confirm adequate drainage performance through in-situ chamber system water level monitoring during natural storm events.

* Operation and maintenance (O&M) cost estimates assume annual inspections, removal of trash and debris twice a year, and removal of sediment from pretreatment structures annually. Verification inspections are included every 5 years to confirm adequate maintenance, and every 15 years to confirm adequate drainage performance through in-situ chamber system water level monitoring during natural storm events.

* Hydrodynamic separators ([[Oil and grit separator| oil and grit separators]] and isolated chamber row as [[Pretreatment| pretreatment]].

* Hydrodynamic separators ([[Oil and Grit Separator| oil and grit separators]] and isolated chamber row as [[Pretreatment| pretreatment]].

* Infiltration chamber system length of 5 metres.

* Infiltration chamber system length of 5 metres.

* Infiltration chamber system height of 0.762 metres.

* Infiltration chamber system height of 0.762 metres.