The flood plains indicate the area of land inundated by runoff in a storm event that has a 1 percent or greater probability of occurring in any given year, assuming maximum probable development (MPD) and future climate change. The flood plains are mapped from hydraulic modelling results. Information specific to each flood plain is accessible using the Identify tool, including the flood report. This dataset is continually updated at catchment scale to reflect the best information available.This dataset is updated by the Heathy Waters team on a regular basis.Disclaimer: In using the Catchments and Hydrology data set, you acknowledge that you have read, understood and agreed to the disclaimers below.The flood plains and flood sensitive area data layers are generated from catchment level modelling based on the datasets, requirements and technology available at the time of model build. They are compiled regional layers with varied data uncertainty and currency, which may directly impact data accuracy for the area of interest. The information provided therefore does not preclude the need for appropriate site-specific assessment and cannot be construed as an endorsement or approval of any development by Auckland Council.The Catchments and Hydrology data set is updated regularly when new information becomes available. As such, downloading and copying activities may result in data invalidity.Whilst due care has been taken in producing the Catchments and Hydrology data sets, Auckland Council gives no warranty as to the accuracy and completeness of any information given and accepts no liability for any error, omission or use of the information.

Predicted natural flow path of water over the ground when the stormwater network is overloaded. This layer is a dissolved version of the OverlandFlowPaths layer where each segment is classified by its upstream catchment area, which will fall into one of the following ranges:2000-4000 m24000 m2 to 1 Ha1–3 Ha3–100 Ha>100 HaThe layer is an update of an existing layer and was created by WSP Opus in 2019.LineageThe OverlandFlowPaths layer is based on Auckland Council’s latest LiDAR data, which was flown in 2016 and became available after processing in 2018. The 2016 LiDAR data had a much higher point density (4 points per m2) than previous versions, which should result in more accurate flow paths. The layer was generated using the D8 flow model algorithm in ArcGIS. Creation dateFinalised in July 2019Update cycleWhenever Auckland Council’s LiDAR has been updated, if possible.Contact PersonMahesh PatelContact PositionSenior Healthy Waters SpecialistDisclaimer:In using the Catchments and Hydrology data set, you acknowledge that you have read, understood and agreed to the disclaimers below.The flood plains and flood sensitive area data layers are generated from catchment level modelling based on the datasets, requirements and technology available at the time of model build. They are compiled regional layers with varied data uncertainty and currency, which may directly impact data accuracy for the area of interest. The information provided therefore does not preclude the need for appropriate site-specific assessment and cannot be construed as an endorsement or approval of any development by Auckland Council.The Catchments and Hydrology data set is updated regularly when new information becomes available. As such, downloading and copying activities may result in data invalidity.Whilst due care has been taken in producing the Catchments and Hydrology data sets, Auckland Council gives no warranty as to the accuracy and completeness of any information given and accepts no liability for any error, omission or use of the information.

This is a working unpublished document based on the NZMS260 Map Series, and is a precursor to the publication of QMAP geological map 3 Auckland. Geological map of New Zealand 1:50 000, Sheet Q10, Helensville / J.C. Schofield. NZ Geological Survey, 1989. - In excellent condition. - Map size: A1. Keywords: HELENSVILLE; QMAP; GEOLOGIC MAPS

This is a working unpublished document based on the NZMS260 Map Series, and is a precursor to the publication of QMAP geological map 3 Auckland. Institute of Geological & Nuclear Sciences geological map 2, Geology of the Auckland urban area / L.O. Kermode. IGNS, 1992. - Geologic map on paper, rich in detail, in excellent condition. - Observation measure: equal parts interpretation and observation. - Map size: 700 x 1200 mm. Keywords: AUCKLAND; QMAP; GEOLOGIC MAPS

Map on transparency, with annotation in ink, rich in detail, in excellent condition. - Observation measure: equal parts interpretation and observation. - Map size: B1. - Compilation sheet for Institute of Geological & Nuclear Sciences geological map Geology of the Auckland urban area : sheet R11. Scale 1:50 000 by L.O. Kermode. Keywords: AUCKLAND; GEOLOGIC MAPS; STRUCTURE; MANUKAU HARBOUR; PUKETUTU ISLAND

This is a working unpublished document based on the NZMS260 Map Series, and is a precursor to the publication of QMAP geological map 3 Auckland. Text, ink and pencil on paper, rich in detail, in excellent condition. - Poster size: A2. - QMAP Auckland proposed map units. - Coordinates give rough placement only. Keywords: QMAP; AUCKLAND; STRATIGRAPHIC UNITS

A pseudo-geographic representation of New Zealand's Territorial Authority administrative areas that gives each area an equal visual weighting. This dataset helps map users visualise data for areas irrespective of their geographic size. In traditional geographic maps, small areas can be overshadowed by larger areas even if their values are equivalent.

Each hexagon represents a Territorial Authority or Auckland Local Board. All Territorial Authority Local Board (TALB) hexagons are the same size irrespective of the geographic size of the TALB. A TALB's hexagon is placed in a position which approximates its actual geographic location in relation to its neighbouring TALBs. In this cartogram the Auckland local boards have been separated from the rest of the country.

TALB is a combined classification of territorial authorities for New Zealand and local boards for Auckland Council. The TALB hexagon cartogram uses TALB2013_V1_00, the definitive set of territorial authority and local board boundaries for 2013 as defined by Stats NZ, as at 1 January 2013. This version contains 21 local boards in the Auckland Council.

This is a working unpublished document based on the NZMS260 Map Series, and is a precursor to the publication of QMAP geological map 3 Auckland. Map, ink on paper, rich in detail, in excellent condition. - Institute of Geological & Nuclear Sciences geological map 21, Geology of the Waihi area / R.L. Brathwaite and A.B. Christie. IGNS, 1996. - Map size: A0. Keywords: PAEROA; QMAP; GEOLOGIC MAPS

This is a working unpublished document based on the NZMS260 Map Series, and is a precursor to the publication of QMAP geological map 3 Auckland. Topographic map on paper, with handwritten annotations in pencil, rich in detail, in excellent condition. - Map size: A1. Keywords: AUCKLAND; QMAP; TOPOGRAPHIC MAPS

The Coastal Storm Inundation dataset maps the extent of sea water coverage expected around the Auckland Region during sustained coastal storm-tide flooding events. Elevated storm-tide sea levels are predicted based on the joint probability of a high tide, a storm surge (which is the rise in sea-level caused by wind action and low barometric pressure related to storm events), and wave setup. (Wave setup is the elevation of the mean sea level at the shoreline due to breaking waves. Larger dynamic wave processes like wave runup and overtopping are not included in this mapping so should be considered on top of these water levels. Rainfall and freshwater flooding are also not included in this data, but are available separately in other geomaps layers e.g. ‘Flood Plains’, or on the Auckland Flood Viewer). Coastal inundation (or coastal flooding) is mapped for a range of Annual Exceedance Probability (AEP) events, where the AEP is the % probability of an event occurring each year. Extreme events can also often be referred to by their return period, or Average Recurrence Interval (ARI). The table below gives the conversion between the two terminologies:AEP (%)ARI (yr)18.154.9202.0501.0100The extreme sea level events were calculated between 2013 and 2019, as compiled in Carpenter, N., R Roberts and P Klinac (2020), Auckland’s exposure to coastal inundation by storm-tides and waves, Auckland Council technical report, TR2020/24, Auckland’s exposure to coastal inundation by storm-tides and waves (knowledgeauckland.org.nz)Increments of sea level rise have been applied on top of storm-tide sea level events in order to assess the increasing coastal flooding hazard into the future. Sea-level rise values applied currently align with the projections by the Intergovernmental Panel on Climate Change sixth assessment report (2021), and the Ministry for the Environment (2022) Interim guidance on the use of new sea-level rise projections, which updates the Ministry for the Environment Coastal Hazards and Climate Change Guidance for Local Government (2017). In MfE’s (2022) interim guidance, (excluding vertical land movement) one metre sea-level rise is projected to occur between 2095 - >2200, depending on the emission scenario used. Two metre sea-level rise is projected to occur in the longer term (beyond 2150).MfE’s (2022) Interim guidance recommends the inclusion of vertical land movement (VLM) in relative sea level rise considerations. These are not included in the above sea level rise predictions due to the high VLM variability across the region. Vertical land movement is generally predicted to increase the rates of relative sea level rise for the Auckland region so should also be incorporated in planning and design.Refer to Interim guidance on the use of new sea-level rise projections | Ministry for the Environmentand NZ Sea Risefor more information on MfE’s interim guidance on sea level rise and vertical land movement.The inundation mapping is based on the Digital Elevation Model ground levels surveyed by aerial LiDAR between 2016-2018. Coastal inundation mapping is not available for some scenarios for the Parakai-Helensville area as this area’s complex dynamics requires hydrodynamic modelling to accurately assess the coastal storm inundation extent. Hydrodynamic modelling has not yet been carried out for all scenarios (e.g. 1.5m sea level rise) but is available for most 2% & 1% AEP scenarios and all tidal (MHWS) scenarios. Please see technical report 2020/024for information on the hydrodynamic modelling. Extreme sea levels for the Auckland region were derived by NIWA in 2013 (Part 1 of Technical Report 2020/24). From 2016-2019, additional extreme sea level data was gathered for:The east coast estuaries (NIWA, 2016; Part 2 of Technical Report 2020/24)Parakai/Helensville Harbour (DHI, 2019; Part 3 of Technical Report 2020/24)Great Barrier Island (NIWA, 2019; Part 4 of Technical Report 2020/24)In 2020, these levels were projected onto the land topography (derived from the 2016-2018 LiDAR survey) by Stantec to establish the extent of coastal flooding. Additional coastal flooding scenarios (annual exceedance probability events + sea level rise) were mapped in 2023 by Watershed Engineering and mean high water spring tides + sea level rise were mapped by NIWA.(Note: The studies informing this mapping of coastal inundation generally used Auckland Vertical Datum 1946. Auckland Council is now transitioning to using New Zealand Vertical Datum 2016.)Update Cycle:Adhoc when improved data becomes available.This data is available to the public on the Geomaps viewer and on Auckland Council Open Data portaland some coastal flood mapping is copied into LIM reports.

A layer file for the Auckland Council Unitary Plan Base Zone dataset. Download this file in conjunction with the Unitary Plan Base Zone.

Paper print, with annotation in pencil and ink, rich in detail, in excellent condition. - Observation measure: interpretation only. - Map size: A0. - Compilation sheet for Edbrooke, S.W.; Heron, D.W.; Forsyth, P.J.; Jongens, R. (compilers) 2015 Geological map of New Zealand 1:1 000 000. Lower Hutt, N.Z.: GNS Science. GNS Science geological map 2. 2 maps. Keywords: NEW ZEALAND; GEOLOGIC MAPS; AUCKLAND; QMAP; COROMANDEL PENINSULA; WAIKATO

Map on transparency, with annotation in ink, rich in detail, in excellent condition. - Observation measure: equal parts interpretation and observation. - Map size: B1. - Compilation sheet for Institute of Geological & Nuclear Sciences geological map Geology of the Auckland urban area : sheet R11. Scale 1:50 000 by L.O. Kermode. Keywords: AUCKLAND; GEOLOGIC MAPS; STRUCTURE; MANUKAU HARBOUR; PUKETUTU ISLAND

Liquefaction Assessment Study Level of Detail:https://www.building.govt.nz/building-code-compliance/geotechnical-educationLevel A - Basic Desktop AssessmentConsiders only the most basic information about geology, groundwater and seismic hazard to assess the potential for liquefaction to occur. This has been completed as a simple ‘desktop study’, based on existing information (geological and topographic maps) and local knowledge.Residual uncertainty: The primary focus is identification of land where there is a high degree of certainty that Liquefaction Damage is Unlikely. For other areas, substantial uncertainty will likely remain regarding the level of risk.Level B - Calibrated desktop assessmentA high-level ‘calibration’ of geological/geomorphic maps. Qualitative assessment of a small number of subsurface investigations provides a better understanding of liquefaction susceptibility and triggering for the mapped deposits and underlying ground profile.Residual uncertainty: Because of the limited amount of subsurface ground information, significant uncertainty remains regarding the level of liquefaction-related risk, how it varies across each mapped area, and the delineation of boundaries between different areasVariabilityThere is considerable uncertainty involved in estimating liquefaction-induced ground damage. These categories are intended to provide a general indication of the damage that might typically be expected. However there can be wide variation in land performance, even where ground conditions appear to be similar, with damage in some cases being much greater or less than inferred from the damage category.Description of uncertaintiesThis assessment has been made at a broad scale across the entire Auckland Council territorial authority area and is intended to approximately describe the typical range of liquefaction across neighborhood-sized areas. It is not intended to precisely describe liquefaction at individual property scale. This information is general in nature, and more detailed site-specific liquefaction assessment will be required for some purposes (e.g. for design of building foundations).Liquefaction CategoryDescription Liquefaction Category is Undetermined A liquefaction vulnerability category has not been assigned at this stage, either because a liquefaction assessment has not been undertaken for this area, or there is not enough information to determine the appropriate category with the required level of confidence. Liquefaction Damage is Unlikely There is a probability of more than 85 percent that liquefaction-induced ground damage will be None to Minor for 500-year shaking. At this stage there is not enough information to distinguish between Very Low and Low. More detailed assessment would be required to assign a more specific liquefaction category. Liquefaction Damage is Possible There is a probability of more than 15 percent that liquefaction-induced ground damage will be Minor to Moderate (or more) for 500-year shaking. At this stage there is not enough information to distinguish between Medium and High. More detailed assessment would be required to assign a more specific liquefaction category. Very Low Liquefaction VulnerabilityThere is a probability of more than 99 percent that liquefaction-induced ground damage will be None to Minor for 500-year shaking. Low Liquefaction Vulnerability There is a probability of more than 85 percent that liquefaction-induced ground damage will be None to Minor for 500-year shaking. Medium Liquefaction Vulnerability There is a probability of more than 50 percent that liquefaction-induced ground damage will be: Minor to Moderate (or less) for 500-year shaking; and None to Minor for 100-year shaking. High Liquefaction Vulnerability There is a probability of more than 50 percent that liquefaction-induced ground damage will be: Moderate to Severe for 500-year shaking; and/or Minor to Moderate (or more) for 100-year shaking. Terms of use:It is important to recognize that these maps are prepared to a city-wide scale and are not intended to provide assessment specific to any one property. Nor does it replace the need for site-specific investigations required for land and building development processes under the Resource Management Act and Building Act.The maps are prepared based on an assessment of natural ground conditions and therefore do not take into account the influence of recent human activities that may influence liquefaction response (i.e. earthworks, ground improvement, foundation design), unless specifically stated within the technical reports. As such, degree of land damage may be less than predicted for a given property where liquefaction risk was addressed during landform or building foundation design.

Cross sections on heavy paper, with annotation in pencil and ink, rich in detail, in fair condition. Observation measure: mainly interpretation. - Map size: B2. Keywords: AUCKLAND ISLANDS; GEOLOGIC MAPS

This is a working unpublished document based on the NZMS260 Map Series, and is a precursor to the publication of QMAP geological map 3 Auckland. Topographic map on paper, medium detail, in excellent condition. - Map size: A1. Keywords: CUVIER ISLAND; QMAP; TOPOGRAPHIC MAPS

Map on heavy paper, with annotation in pencil and ink, medium in detail, in good condition. Observation measure: equal parts interpretation and observation. Map size: B2. Keywords: AUCKLAND ISLANDS; GEOLOGIC MAPS; ADAMS ISLAND; CARNLEY HARBOUR

Map, ink and pencil on paper, rich in detail, in good condition. - Observation measure: equal parts interpretation and observation. - Map size: B3. - Coordinates give rough placement only. Keywords: AUCKLAND; REGIONAL GEOLOGY; GEOLOGIC MAPS

Geological sketch on heavy paper, with annotation in pencil and ink, rich in detail, in fair condition. Observation measure: observations only. Map size: B2. Keywords: AUCKLAND ISLANDS; GEOLOGIC MAPS; MUSGRAVE INLET

Map on ammonia print, rich in detail, in good condition. Observation measure: equal parts interpretation and observation. Map size: B2. Keywords: AUCKLAND ISLANDS; GEOLOGIC MAPS; CARNLEY HARBOUR