The Auckland region has a high exposure to coastal hazards including coastal instability and erosion. These hazards can present a safety risk, adversely affect property and infrastructure, and damage or destroy cultural and environmental sites. A programme of research has been undertaken to identify, at a regional level, the Area Susceptible to Coastal Instability and/or Erosion (ASCIE). ASCIE is the area landward of the current coastline that is at risk because of coastal erosion or instability caused by coastal erosion. The study forecasts the areas of Auckland’s coastline that could be affected by coastal erosion and instability under a range of climate change (sea-level rise) scenarios and timeframes.This data is mapped at a 0.5 km to 5.0 km scale and is not intended for site-specific use other than to determine whether more detailed study is warranted. Due to the large scale of the assessment (i.e., 0.5-5 km resolution) errors are inherently introduced due to the variance within a coastal cell. To identify areas that could potentially be susceptible to coastal instability and/or erosion typical upper bound values have been adopted for each coastal cell. This means that in some areas the ASCIE may be overpredicted (i.e., shown further landward). However, this also means that in ASCIE may be underpredicted in areas where values are larger than the typical upper bound value (i.e., the largest or maximum values). Therefore, this assessment isrecommended to be used as a preliminary tool. The regional-scale ASCIE can be refined by undertaking an assessment on a more detailed scale.https://www.knowledgeauckland.org.nz/publications/predicting-auckland-s-exposure-to-coastal-instability-and-erosion/The regional-scale assessment of ASCIE is based on available data and tools and understanding ofcoastal processes. Uncertainty may be introduced to the assessment by:an incomplete understanding of the parameters influencing the areas susceptible to coastal instability and/or erosionan imprecise description of the natural processes affecting, and the subsequent quantification of each individual parametererrors introduced in the collection and processing of datascale of assessment and variance in the processes occurring within individual coastal cellsother hazards such as land based geotechnical instability, or planning and landscape impacts etc. that are not accounted for within the ASCIEadopted methodologiesTerms and Conditions:You are permitted to use this website and any data, maps, plans, content and information ("information") provided by this website, on the following terms and conditions: The website and the information provided in it are the copyright of Auckland Council. This website is a public service and may be used for personal and business purposes. However, you are not permitted to copy or republish any substantial amount of the information from this website without the prior written consent of Auckland Council. Whilst care has been taken in providing this website, all information should be considered as being illustrative and indicative only. Your use of information from this website is entirely at your own risk. Auckland Council does not give and expressly disclaims any warranty as to the accuracy or completeness of the information or its fitness for any purpose. Auckland Council accepts no liability for any error, omission, or inaccuracy of the information or from any use of or reliance on the information provided by this website. You waive and release Auckland Council from any claims arising from your use of this website or the information provided by it. You indemnify Auckland Council against any claims, loss or damage arising in connection with your use of this website or the information provided by it. Information from this website may not be used for the purposes of any legal disputes. Information presented:This website presents regional level information. The mapping, and the calculations that informed it, present general information which is generally valid for stretches of coastline ("coastal cells") from 0.5 km long to 5.0 km long. It is not intended for site specific use. To identify areas that could potentially be susceptible to coastal instability and/or erosion (ASCIE), typical upper bound values have been adopted for each coastal cell. This means that in some areas the ASCIE may be overpredicted. However, this also means that an ASCIE may be underpredicted in areas where values are larger than the typical upper bound value. Therefore, this assessment is recommended to be used as a preliminary tool. The information presented relates to potential future coastal erosion, and the land instability caused by this erosion. There are other hazards that are not presented here, such as coastal inundation and tsunami. See the Auckland Hazard Viewer for these other hazards: here This ASCIE mapping should not be used for the assessment of the erosion susceptibility of individual properties. As a 'first-pass' assessment it may include significant inaccuracies at localised levels. Assessment of individual properties (e.g. for consenting, valuation and insurance purposes) should be based on a site-specific (Level C) assessment prepared by a suitably qualified and experienced practitioner. The lines shown on these maps do not show the future position of the coast. Rather, they show the area that might become unstable as a result of a smaller area of coastal erosion. Important note:This ASCIE mapping should not be used for the assessment of the erosion susceptibility of individual properties. As a 'first-pass' assessment it may include significant inaccuracies at localised levels. Assessment of individual properties (e.g. for consenting, valuation and insurance purposes) should be based on a site-specific (Level C) geotechnical assessment prepared by a suitably qualified and experienced practitioner.The lines shown on these maps do not show the future position of the coast. Rather, they show the area that might become unstable as a result of a smaller area of coastal erosion. See below for more details. Lineage: The methodology used to identify these areas is presented in Auckland Council Technical Report RT2020/021 “Regional Assessment of Areas Susceptible to Coastal Erosion and Instability” available on the Knowledge Auckland website.Creation Date: 31/05/2021
