Changes

* Infiltration volume target for the design storm event, V_i (m³), based on average annual water budgets for the catchment for pre- and post-development scenarios and the infiltration volume deficit (pre-development minus post-development infiltration)

* Infiltration volume target for the design storm event, V_i (m³), based on average annual water budgets for the catchment for pre- and post-development scenarios and the infiltration volume deficit (pre-development minus post-development infiltration)

* Drainage time t (h), time required to fully drain the active storage components of the practice (i.e surface ponding and infiltration water storage depths), based on local criteria or long term average inter-event period for the location

* Drainage time t (h), time required to fully drain the active storage components of the practice (i.e surface ponding and infiltration water storage depths), based on local criteria or long term average inter-event period for the location

* Field measured infiltration rate of the underlying native soil f_f (mm/h), median of measurements or based on interpolation from median grain-size distribution results

* Field measured infiltration rate of the underlying native soil f (mm/h), median of measurements or based on interpolation from median grain-size distribution results

* Design infiltration rate of the underlying native soil f' (mm/h), median field measured value divided by a safety factor (z)

* Design infiltration rate of the underlying native soil f' (mm/h), median field measured value, f divided by a safety factor, z

* Safety factor, z (dimensionless value between 2 and 3) chosen by designer based on consideration of risk factors

* Safety factor, z (dimensionless value between 2 and 3) chosen by designer based on consideration of risk factors

* Proposed surface grade elevation at the practice location (metres above sea level, masl)

* Proposed surface grade elevation at the practice location (metres above sea level, masl)