Waikato Region Modelled Local Flood Depth

Purpose: This data has been published to support the Waikato Regional Hazards Portal. Statement: River flood depth for a 1% annual exceedance probability (AEP) event, derived from 2D local flood modelling. To determine the potential flood depth, the flood level data was reclassified into flood depth above ground level (from LiDAR data) in meters. Data is presented as polygons which show flood depth classes (not values), and should be used for mapping purposes. Attribute information includes the year the modelling was completed (from ~2006 onwards). Models have incorporated the best available information at the time of their creation, generally including (but not always) LiDAR data, and flood event survey assessments. A climate change component is generally included in the modelling and will likely be based on the best available MfE guidance from the period of modelling. All flood depth information takes into account the presence of WRC-managed stopbanks and floodwalls, with the exception of Tararu and Te Puru (which have been modelled using a “stopbanks down” approach). The LiDAR data is converted to a grid which has limitation when assessing small stream channels and topographic features such as ridges. This may lead to minor discrepancies in water flows which may lead to limitations in defining flood extents. Internal drainage such as storm water systems, culverts, piping etc, are generally not included in the modelling. Depending on how the model is configured, they often only consider the main watercourse, so flooding of minor channels, tributaries, ponding and coastal inundation may not be represented by the flood extent. This information is not intended to replace more detailed hydrogeological and survey data required for Building Consents or Resource Consents. The information shown is current as of the time of modelling, including assumptions around climate change and hydrology etc. Note that this is a “live” dataset and further additions will be made as and when available and verified. WRC Natural Hazard Information Hierarchy: 1. Property to local scale Information that is suitable to be used for property specific purposes, including within District Plans, or for: • risk assessments • resource or building consents • decisions that concern personal or public safety • the conduct of commercial business • insurance purposes • land information memorandum reports (LIMs) The information is based on detailed hazard modelling or hazards mapping that includes both current and future possible scenarios, along with the associated likelihoods and impacts. Users should make sure they are using the most appropriate natural hazards data available. Data held by other organisations may be better suited for property scale use or may be more up to date. Before using any of the Waikato Regional Council natural hazard data at property scale or for subdivision development purposes please contact the Waikato Regional Council Regional Resilience team for guidance. Further information on resource consenting is available here. WRC Metadata: HAZARD.sdeadmin.HAZ_MOD_LOCAL_FLOOD_DEPTH - HAZARDS - Regional Hazards Portal - GIS Layers Terms of Use: This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License. Should users wish to distribute or publish derivatives or modified versions of this data then they must seek a data use agreement through WRC first. See the Waikato Regional Hazards Portal Terms of use here Waikato Regional Hazards Portal - Terms of use | Waikato Regional Council.数据集用途：本数据集发布旨在支持怀卡托地区灾害门户（Waikato Regional Hazards Portal）建设。 数据集说明：本数据集包含1%年超越概率（AEP, Annual Exceedance Probability）事件对应的河道洪水深度数据，该数据通过二维局地洪水模型推演得到。为明确潜在洪水淹没深度，研究团队基于激光雷达（LiDAR）数据，将洪水位数据重分类为地面以上洪水深度（单位：米）。数据以多边形矢量图层形式呈现，仅展示洪水深度分级（而非具体数值），仅可用于制图用途。 属性信息包含模型完成年份（建模时间约为2006年起）。建模过程采用了建模完成时可获取的最优数据集，通常（但非全部）涵盖激光雷达数据与洪水灾害调查评估结果。建模过程通常纳入气候变化相关要素，相关参数一般基于建模时段内新西兰环境部（MfE, Ministry for the Environment）发布的最新指导规范。所有洪水深度数据均已考虑怀卡托地区委员会（WRC, Waikato Regional Council）管理的防洪堤与防洪墙影响，但Tararu与Te Puru区域除外，该两地采用“防洪堤拆除”情景进行建模。 原始激光雷达数据被转换为栅格网格，该格式在评估小型河道与山脊等地形特征时存在局限性，可能导致水流模拟出现微小偏差，进而影响洪水淹没范围的精准界定。建模过程通常未纳入内部排水系统（如雨水管网、涵洞、暗管等）；根据模型配置不同，部分模型仅考虑主河道水文过程，因此小型河道、支流、积水与海岸淹没等场景可能未被准确反映。 本数据集不可替代建筑许可或资源许可所需的详细水文地质与勘测数据。数据集信息基于建模完成时的现状，包括气候变化与水文相关的各项假设。本数据集为“动态更新”数据集，后续将根据已验证的新增数据持续完善。 怀卡托地区委员会自然灾害信息分级：1. 地块至局地尺度信息。该类信息适用于地块特定用途，包括纳入地区规划，或用于：• 风险评估 • 资源或建筑许可申请 • 涉及个人或公共安全的决策制定 • 商业经营活动开展 • 保险业务办理 • 土地信息备忘录（LIM, Land Information Memorandum）报告编制。本数据集基于包含当前与未来潜在情景的精细化灾害建模或灾害制图，并关联了相应的发生概率与影响程度。使用者应确保选用当前可用的最适配自然灾害数据。其他机构持有的数据集可能更适用于地块尺度应用，或时效性更强。若需将怀卡托地区委员会的自然灾害数据用于地块尺度或分区开发用途，请联系怀卡托地区委员会区域韧性团队获取指导。更多关于资源许可的信息可在此查阅。 怀卡托地区委员会元数据：HAZARD.sdeadmin.HAZ_MOD_LOCAL_FLOOD_DEPTH - 灾害管理 - 区域灾害门户 - GIS图层 使用条款：本作品采用知识共享署名-禁止演绎4.0国际许可协议（CC BY-ND 4.0）进行许可。若使用者需分发或发布本数据集的衍生作品或修改版本，须先向怀卡托地区委员会申请数据使用协议。具体条款可参见怀卡托地区灾害门户使用条款：怀卡托地区灾害门户 - 使用条款 | 怀卡托地区委员会。