This dataset provides updated liquefaction vulnerability categories for the Canterbury part of Waitaki District. The vulnerability categories are those set out in the Ministry for Business, Innovation and Employment and Ministry for the Environment's 2017 Planning and engineering guidance for potentially liquefaction-prone land. The liquefaction categories were revised from the liquefaction susceptibility dataset supplied to Environment Canterbury by GNS Science in September 2020 as part of the Waitaki District Plan review. The original 2020 dataset was derived from a Level A (Basic Desktop) assessment using available geological, geomorphological, and groundwater information. In this 2023 dataset we have made minor revisions to the original 2020polygon boundaries to better fit the detail of the geomorphology interpreted from available lidar and aerial imagery, and have changed the nomenclature and attribute fields to follow the 2017 MBIE/MfE liquefaction guidance.

Accompanying reports are Barrell, D.J.A.,2020. Assessment of liquefaction hazards in the Waitaki District within the Canterbury region. Lower Hutt (NZ): GNS Science. 34 p. Consultancy Report 2020/69 and Jack, H., 2023. Revised liquefaction information for the Canterbury part of Waitaki District, Environment Canterbury Science Summary Report R23/51.