Detailed information about foundation requirements is available on the Ministry of Business, Innovation and Employment (MBIE)website.Technical category information is provided on behalf of the Ministry for Business, Innovation and Employment (MBIE) and was the best information available at the time of publication on Canterbury Maps in 2017. A technical category (1, 2 or 3) was assigned to residential properties on flat land in parts of Christchurch City, and Selwyn and Waimakariri districts by MBIE following the 2010/11 earthquakes. The technical categories were established to provide guidance on appropriate geotechnical assessments and foundation solutions for house repairs and reconstruction during the earthquake recovery. The technical categories were intended to have a limited life and were not intended to be updated over time. Details of any work done on an individual property since 2010 to reduce the liquefaction susceptibility of the land, or investigations that show the land meets the definition of another technical category, should be provided to prospective buyers, insurance companies or Christchurch City Council, Waimakariri District Council or Selwyn District Council.Published in the gazetted Land Use Recovery Plan 6/12/2013 https://cera.govt.nz/recovery-strategy/built-environment/land-use-recovery-planTechnical Category 1 (TC 1)Land that was classified Technical Category 1 (TC1) was suitable for homes to be repaired or rebuilt after the 2010/11 Canterbury earthquakes.TC1 land generally did not experience liquefaction-related land damage or settlement during the 2010/11 Canterbury earthquakes. Land damage from liquefaction is unlikely on TC1 land during significant future earthquakes. Standard foundations for concrete slabs or timber floors are considered adequate to address liquefaction hazard for house repairs and rebuilds on TC1 land, but normal consenting requirements still apply (e.g. to confirm suitable ground bearing strength and assess all other hazards).Technical Category 2 (TC 2)Land that was classified Technical Category 2 (TC2) was suitable for homes to be repaired or rebuilt after the 2010/11 Canterbury earthquakes. TC2 land may have experienced liquefaction-related land damage and settlement during the 2010/11 Canterbury earthquakes. Land damage from liquefaction is possible on TC2 land in future significant earthquakes. While TC2 land is considered suitable for residential construction, stronger foundations are required for house repairs and rebuilds. This may include standard timber piled foundations for houses with lightweight cladding and roofing and suspended timber floors or enhanced concrete foundations.Technical Category 3 (TC 3)TC3 land experienced liquefaction-related land damage and settlement during the 2010/11 Canterbury earthquakes. Land damage from liquefaction is possible on TC3 land in future significant earthquakes. While TC3 land is considered suitable for residential construction, site-specific geotechnical investigation and specific engineering foundation design are required for house repairs and rebuilds.There are no one-size-fits-all foundation solution for repairs or rebuilds on TC3 land. Site-specific geotechnical investigations will identify the best foundation for the repair or rebuild to reduce the risk of property damage or injury in future earthquakes. This may include deep foundation piles or ground improvement work.N/A - Port Hills & Banks PeninsulaProperties in parts of the Port Hills and Banks Peninsula have not been given a Technical Category. This is because properties in the hill areas have always required a site-specific foundation design and are not generally subject to liquefaction or lateral spread.Normal consenting procedures will apply in these areas.N/A - Rural & UnmappedProperties in rural areas or beyond the extent of land damage mapping, and properties in parts of the Port Hills and Banks Peninsula have not been given a Technical Category.Normal consenting procedures will apply in these areas.N/A - Urban NonresidentialTechnical Category not applicable means that non-residential properties in urban areas, properties in rural areas or beyond the extent of land damage mapping, and properties in the Port Hills and Banks Peninsula have not been given a Technical Category.Normal consenting procedures will apply in these areas.Red Zone (Port Hills)Red Zone (Port Hills) are areas where the threat to life from cliff collapse or rocks rolling downhill was considered unacceptable following the 2010/11 Canterbury earthquakes. The areas were defined by the Canterbury Earthquake Recovery Authority (CERA). The Crown offered to purchase properties in these areas from the owners, and the properties that were sold to the Crown are now administered by Land Information New Zealand (LINZ) and/or Christchurch City Council. You can find more information on the LINZ website LINZ website. Some properties were not sold to the Crown and in some cases the owners have subsequently installed mitigation works to reduce the cliff collapse or rockfall risk to an acceptable level. Details of any work done to reduce the cliff collapse or rockfall risk to individual properties should be provided to prospective buyers and insurers.Red Zone (Port Hills) areas within Christchurch City are now part of Christchurch City Council’s slope instability hazard management areas. You can find more information on these management areas in Chapter 5 of the Christchurch District Plan, and find more information on Port Hills slope stability on the Christchurch City Council website.Red Zone Christchurch & WaimakariThe Red Zone (Flat Land) areas are where the Crown offered to purchase properties from the owners after 2010/11 Canterbury earthquakes. The Government considered that making the land suitable to build on again and repairing roads and underground services in these areas would be very expensive and take a very long time. It gave property owners in these areas the option to sell their properties to the Crown so that they could resettle more quickly. The areas were defined by the Canterbury Earthquake Recovery Authority (CERA) and the properties that were sold to the Crown are now administered by Land Information New Zealand (LINZ). You can find more information on the LINZ website. Red zone flat land areas within Christchurch City are now part of Christchurch City Council’s Specific Purpose (Flat Land) Recovery Zone. You can find more information on this zone on the Christchurch District Plan.CCC Liquefaction & CERA InformationIn 2019 Christchurch City Council completed a liquefaction hazard study , encompassing the Christchurch urban area, which uses the extensive information about ground conditions gathered since the 2010/11 Canterbury earthquakes and follows the most recent national liquefaction guidance. This includes an updated liquefaction vulnerability map, and an online tool which helps to visualise an area’s vulnerability to liquefaction under different conditions. For details visit the CCC liquefaction information website. You can find out more information about the inherited responsibilities of the Canterbury Earthquake Recovery Authority (CERA) on the Department of the Prime Minister and Cabinet website.

This entity describes Canterbury Earthquake Recovery Authoritys (CERA) broad classification (eg, Red Zone, Orange Zone, etc) of earthquake land damage within Christchurch, indicating what stage the land assessment process is at and if concluded, whether or not it will be possible to rebuild on the land. Areas currently zoned Orange will progressively be reclassified as either Red or Green. Areas zoned Green are further classified into technical categories - refer QuakeFoundationDesign entity.Data Source is Tonkin & Taylor who supply updates as a WFS feed on behalf of CERA. The data is 'maintained' inhouse via a bulk archive of existing records from QuakeLandZone then running of an app to repopulate with the latest CERA update. This feature will be intersected with stRatingUnitCentroid for the purposes of Spatial Significance Comment generation and QuakeLandZone records MUST therefore be disassociated BEFORE being archived.It is spatially abstracted to an area.Entity type Concept.

Survey name: Christchurch, Site 1 Post 1988 Agricultural Land Classification (ALC) site survey data – scanned original paper maps and survey reports for individual sites surveyed in detail between 1989 and 1999 by the Ministry of Agriculture Fisheries and Food. Where Grade 3 is mapped this includes the subdivision of Grade 3 into subgrades 3a and 3b. Surveys use the current grading methodology as described in "Agricultural Land Classification of England and Wales," a link for which is provided with the data. Individual sites have been mapped at varying scales and level of detail from 1:5,000 to 1:50,000 (typically 1:10,000). Unedited sample point soils data and soil pit descriptions are also available for some surveys. Attribution statement: © Natural England copyright. Contains Ordnance Survey data © Crown copyright and database right [year]. (Environment theme)

This soil map for Christchurch City was compiled at 1:25,000 scale from several published and unpublished soil maps held by Landcare Research including:

Christchurch Region NZ Soil Survey Report 16 1:63 360 Part Paparua County NZ Soil Bureau Bulletin 34 1:31 860 Part Port Hills NZ Soil Bureau Bulletin 35 1:31 860 Heathcote County NZ Soil Bureau Report 1 1:31 860 Part Port Hills unpublished map 1:10 000 Sumner region NZ Soil Survey Report 70 1: 8 000

The database was constructed containing attributes relating to land use for each map unit and three land use interpretations generated: horticultural versatility, land use capability and urban suitability.