1% AEP Urban Stormwater Flood Modelling Extent 2019 - Scenario Existing Climate

NOTE: This dataset can only be downloaded in a WGS 1984 projection. For accurate spatial analysis in New Zealand, ensure it is reprojected to the NZ standard projection. The dataset shows the extent of flooding in an extreme 1-in-100-year rainfall event, which has a 1% probability of occurring in any given year. Scenario 'Existing Climate': HIRDS V4 existing climate 24 hours design rainfall The flood mapping extents include shallow flooding and low hazard water depths. The flooding extent shown uses the ground levels in 2019. Any changes to ground levels since this date (such as through development and earthworks) are not represented. The data was obtained by undertaking dynamic 1D and 2D (computer) modelling which takes into account the landuse, terrain, detailed survey information and information collected about the stormwater assets in 2019. The modelling adopts several standard assumptions around climate, rainfall, ground information and runoff. Height information is in Moturiki 1953 datum. Included are the urban areas of Cambridge, Te Awamutu, Kihikihi, Pirongia and Ohaupo. For further information please go to the website or contact the team via email: [e-mail]注意：本数据集仅可采用WGS 1984坐标系（WGS 1984 projection）下载。若需在新西兰开展精准空间分析，请将其重投影至新西兰标准坐标系。本数据集展示了百年一遇极端降雨事件的洪水淹没范围——该事件在任意一年发生的概率为1%。“当前气候情景”（Existing Climate）采用HIRDS V4当前气候下的24小时设计降雨值。本次洪水淹没范围制图包含浅涝区及低危险水位区域，其淹没范围基于2019年的地面高程数据生成，未纳入该日期之后因开发、土方工程等导致的地面高程变化。本数据集通过开展动态一维（1D）与二维（2D）计算机建模生成，建模过程综合考量了2019年的土地利用、地形、详细勘测信息以及雨水设施资产相关数据。建模过程中采用了若干围绕气候、降雨、地面信息及径流的标准假设。高程数据采用Moturiki 1953基准面（Moturiki 1953 datum）。本次数据集涵盖剑桥（Cambridge）、蒂阿瓦木图（Te Awamutu）、基希基希（Kihikihi）、皮龙吉亚（Pirongia）及奥哈波（Ohaupo）的城区范围。如需进一步信息，请访问相关网站或通过邮箱[e-mail]联系项目团队。