Flood — Awareness — Storm Tide

***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 storm tide inside the Brisbane City Council local government area. This layer contributes to the storm tide Flood Awareness Map.\n\nStorm tide flooding happens when a storm surge creates higher than normal sea levels. A storm surge can occur due to a low atmospheric pressure meteorological system and/or strong on\\-shore winds force sea levels to rise above normal levels among other reasons. Flooding can also occur from king tides. King tides occur throughout the year and are higher than normal tides. Low lying parts of Brisbane and the Bayside suburbs may experience storm tide flooding. Tide affected areas of the river, tidal creeks and other waterways may also be affected.\n\nThere are four different storm tide flooding likelihood areas in Flood Awareness Map, namely High, Medium, Low and very low.\n\nThe storm tide High likelihood layer consists of the current 5% Annual Exceedance Probability (AEP) (20 year Average Recurrence Interval (ARI)) (2\\.1mAHD) storm tide flood extent.\n\nThe storm tide Medium likelihood layer consists of the current 1% AEP / 100 year ARI (2\\.5mAHD) storm tide flood extent (outside high likelihood area). \n\nThe storm tide Low likelihood layer consists of the 0\\.2% AEP / 500 year ARI (2\\.85mAHD) storm tide flood extent (outside high and medium likelihood areas). \n\nThe storm tide Very Low likelihood consists of the 0\\.05% AEP / 2000 year ARI (3\\.2mAHD) storm tide flood extent (outside high, medium and low likelihood areas).\n\n本数据集可于布里斯班市议会（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、交互操作及多格式下载等附加功能。 本数据集于2013年6月编制完成，用于表征布里斯班市议会管辖区内风暴潮引发洪水的发生概率，为风暴潮洪水预警地图（Flood Awareness Map）提供图层支撑。 风暴潮洪水指风暴增水导致海平面高于正常水位的现象。风暴增水可由低压气象系统、强向岸风等多种因素引发，使海平面抬升至正常水位以上。此外，天文大潮也可能引发洪水：天文大潮全年均会出现，其水位高于常规潮汐。布里斯班境内的低洼区域及海湾郊区可能遭受风暴潮洪水影响，河流受潮汐影响的河段、潮汐溪及其他水道区域同样可能受波及。 本风暴潮洪水预警地图共设置四类风险等级区域，分别为高、中、低及极低风险区。 风暴潮高风险图层对应当前5%年超越概率（Annual Exceedance Probability, AEP）（即20年平均重现期（Average Recurrence Interval, ARI））下的风暴潮洪水淹没范围，对应高程为2.1米澳大利亚高程基准面（mAHD）。 风暴潮中风险图层对应当前1%年超越概率/100年平均重现期下的风暴潮洪水淹没范围（不含高风险区域），对应高程为2.5米澳大利亚高程基准面（mAHD）。 风暴潮低风险图层对应0.2%年超越概率/500年平均重现期下的风暴潮洪水淹没范围（不含高、中风险区域），对应高程为2.85米澳大利亚高程基准面（mAHD）。 风暴潮极低风险图层对应0.05%年超越概率/2000年平均重现期下的风暴潮洪水淹没范围（不含高、中、低风险区域），对应高程为3.2米澳大利亚高程基准面（mAHD）。