Flood — Awareness — River

***This dataset is available on Brisbane City Council’s open data website – [data.brisbane.qld.gov.au](https://data.brisbane.qld.gov.au). The site provides additional features for viewing and interacting with the data and for downloading the data in various formats.*** \n \nThis dataset, created in June 2013, provides an indication of the likelihood of a flood occurring from Brisbane River inside the Brisbane City Council local government area. This layer contributes to the overall Flood Awareness Mapping for Brisbane City Council.\n\nRiver flooding happens when widespread, prolonged rainfall occurs over the catchment of a river. As the river reaches capacity, excess water flows over its banks, causing flooding. River flooding can occur hours after the rain has finished, depending on the location within the catchment. The extent of river flooding depends on the severity of the weather and the capacity of the river among other things. The impact on a home depends on how close it is to the river and the proximity to low lying areas.\n\nThere are four different river flooding likelihood areas in Flood Awareness Map, namely High, Medium, Low and very low.\n\nThe river flood High likelihood layer consists of the 5% Annual Exceedance Probability (AEP) (20 year Average Recurrence Interval (ARI)) flood extent. The extent was sourced from Brisbane River Catchment Flood Study (BMT, 2017\\) which was commissioned by State Government.\n\nThe river flood Medium likelihood layer consists of the 1% AEP (100 year ARI) flood extent (outside high likelihood area). The extent was sourced from Brisbane River Catchment Flood Study (BMT, 2017\\) which was commissioned by State Government. \n\nThe river flood Low likelihood layer consists of the 0\\.2% AEP (500 year ARI) flood extent (outside high and medium likelihood areas). The extent was sourced from Brisbane River Catchment Flood Study (BMT, 2017\\) which was commissioned by State Government. \n\nThe river flood Very Low likelihood layer consists of the Extent of the 0\\.05% AEP (2000 year ARI) flood extent (outside high, medium and low likelihood areas). The extent was sourced from Brisbane River Catchment Flood Study (BMT, 2017\\) which was commissioned by State Government.\n\n

本数据集可从布里斯班市议会（Brisbane City Council）开放数据平台[data.brisbane.qld.gov.au](https://data.brisbane.qld.gov.au)获取，该平台提供数据浏览、交互以及多格式下载等附加功能。

本数据集于2013年6月创建，用于表征布里斯班市议会管辖范围内布里斯班河发生洪水的可能性等级，该图层为布里斯班市议会的全域洪水预警地图（Flood Awareness Mapping）提供支撑。

河流洪水是指河流流域遭遇大范围持续性降雨时，当河流水位达到承载上限，过剩水量漫过堤岸引发的灾害。根据流域内位置的不同，洪水可能在降雨结束数小时后才会爆发。洪水影响范围取决于天气强度、河道承载能力等多重因素，而对住宅的影响则取决于住宅与河流的距离以及是否临近低洼区域。

本次洪水预警地图中共设有四类洪水发生可能性等级区域，分别为高、中、低以及极低等级。

高可能性河流洪水图层对应年超越概率（Annual Exceedance Probability，AEP）5%（即平均重现期（Average Recurrence Interval，ARI）20年）的洪水淹没范围，该范围数据源自昆士兰州政府委托开展的《布里斯班河流域洪水研究》（BMT，2017）。

中可能性河流洪水图层对应年超越概率1%（平均重现期100年）的洪水淹没范围（高可能性区域以外范围），数据源自昆士兰州政府委托的《布里斯班河流域洪水研究》（BMT，2017）。

低可能性河流洪水图层对应年超越概率0.2%（平均重现期500年）的洪水淹没范围（高、中可能性区域以外范围），数据源自昆士兰州政府委托的《布里斯班河流域洪水研究》（BMT，2017）。

极低可能性河流洪水图层对应年超越概率0.05%（平均重现期2000年）的洪水淹没范围（高、中、低可能性区域以外范围），数据源自昆士兰州政府委托的《布里斯班河流域洪水研究》（BMT，2017）。