[2019] NZEnvC 077 Bunnings Limited v Queenstown Lakes District Council [pdf, 3.3 MB]
...collect and dispose of stormwater from all potential impervious areas within the development area to the Council reticulated stormwater disposal system based on a worst case 1 in 20 year rainfall event return period. The lateral connection(s) shall be designed to provide gravity drainage for the entire development area; and ii. A secondary protection system consisting of secondary flow paths to cater for the 1 % AEP storm event and/or setting of appropriate building floor levels to ensur...