Parent Layer: Hazards and Risks

Name: Liquefaction Areas

Display Field: DESCRIPTION

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Description: Overlay indicating draft liquefaction susceptibility areas, and was supplied for the purpose of the 2020 District PlanLayer Shape file provided by: - Environment Canterbury - ECANDate that the Layer was provided: - 29th of June 2020-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------Metadata Description from the E-can -This dataset provides liquefaction susceptibility areas for Timaru district. The susceptibility areas are based on the areas given in McCahon, 2013, Liquefaction Hazard in Timaru District (Environment Canterbury report R13/29), which were mainly based on 1:250,000 geological map units, with some groundwater and test pit information in urban areas.The boundaries of the susceptibility areas have been modified using 1:50,000 topographic maps and lidar where available (Timaru township area and the Canterbury Plains), and are accurate to 1:50,000 for most of the district and approximately 1:10,000 in Timaru township. In some areas, new polygons have been added to delineate Holocene or Pleistocene sediment as per the 1:250,000 geological map units, where these were previously shown as rock or hill soils in the 2013 dataset. This includes areas along Taitarakihi Creek and the heads of Waimataitai Valley and Saltwater Creek in Timaru township.The susceptibility areas have been renamed from the 2013 names to be consistent with Table 1.1 of the 2017 Ministry of Business, Innovation and Employment guidance Planning and engineering guidance for potentially liquefaction-prone land. Fields have also been added providing suggested levels of geotechnical liquefaction investigations that should be undertaken in each area for different activities (subdivision, important infrastructure, and building consents) to determine the liquefaction hazard and appropriate mitigation measures, if required. These are also based on the 2017 MBIE guidance (Tables 3.6 and 3.7).This dataset has been reviewed by Ian McCahon, author of the 2013 liquefaction report.

Service Item Id: 428049b74d6741c4812bcf4ba384ddc9

Copyright Text: Dataset created by Helen Jack, Environment Canterbury - June 2020.

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