Flood — Awareness — Creek

***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 creeks inside the Brisbane City Council local government area. This layer contributes to the overall Flood Awareness Map.\n\nCreek flooding occurs when intense rain falls over a creek catchment. Runoff from houses, streets, parks etc contributes to creek flooding. Once the capacity of the creek is reached, overtopping of the banks will occur which can cause flooding. Creek floodwaters can be very fast moving and rise and recede quickly without much warning.\n\nThere are four different creek flooding likelihood areas in Flood Awareness Map, namely High, Medium, Low and very low.\n\nThe creek High likelihood layer consists of a combination of the 5% Annual Exceedance Probability (AEP) (20 year Average Recurrence Interval (ARI)) from BCC’s flood inundation extents usually utilising the surfaces produced as part of a Flood Study where available and the remaining areas from the 5% AEP (20 year ARI) delivered as part of the Citywide Flood Awareness Mapping study (Worley Parsons, 2012\\).\n\nThe creek Medium likelihood layer consists of a combination of the 1% AEP (100 year ARI) from BCC’s flood inundation extents (outside high likelihood area) usually utilising the surfaces produced as part of a Flood Study where available and the remaining areas from the 1% AEP (100 year ARI) delivered as part of the Citywide Flood Awareness Mapping study (Worley Parsons, 2012\\).\n\nThe creek Low likelihood layer consists of a combination of the 0\\.2% AEP (500 year ARI) from BCC’s flood inundation extents (outside high likelihood area) usually utilising the surfaces produced as part of a Flood Study where available and the remaining areas from the 0\\.2% AEP (500 year ARI) delivered as part of the Citywide Flood Awareness Mapping study (Worley Parsons, 2012\\).\n\nThe creek Very Low likelihood layer consists of a combination of the 0\\.05% AEP (2000 year ARI) from BCC’s flood inundation extents (outside high likelihood area) usually utilising the surfaces produced as part of a Flood Study where available and the remaining areas from the 0\\.05% AEP (2000 year ARI) delivered as part of the Citywide Flood Awareness Mapping study (Worley Parsons, 2012\\).\n\n

本数据集可在布里斯班市议会开放数据网站获取——[data.brisbane.qld.gov.au](https://data.brisbane.qld.gov.au)。该网站提供额外功能，支持数据查看、交互及多种格式的下载。

本数据集创建于2013年6月，用于指示布里斯班市议会地方政府辖区内小溪洪水发生的可能性。该图层是整体洪水预警地图（Flood Awareness Map）的组成部分。

当强降雨覆盖小溪流域时，便会发生小溪洪水。来自住宅、街道、公园等区域的径流会加剧小溪洪水。一旦小溪容量达到上限，河岸漫溢便会发生，进而引发洪水。小溪洪水水流速极快，且常毫无预警地迅速涨落。

洪水预警地图包含四种小溪洪水可能性区域，即高、中、低及极低。

小溪高可能性图层由两部分组合而成：布里斯班市议会洪水淹没范围中的5%年超越概率（Annual Exceedance Probability, AEP）（20年平均重现期（Average Recurrence Interval, ARI））区域（尽可能使用洪水研究生成的表面数据），以及全市洪水预警地图研究（Worley Parsons, 2012）中提供的剩余5% AEP（20年ARI）区域。

小溪中可能性图层由两部分组合而成：布里斯班市议会洪水淹没范围中（高可能性区域以外）的1% AEP（100年ARI）区域（尽可能使用洪水研究生成的表面数据），以及全市洪水预警地图研究（Worley Parsons, 2012）中提供的剩余1% AEP（100年ARI）区域。

小溪低可能性图层由两部分组合而成：布里斯班市议会洪水淹没范围中（高可能性区域以外）的0.2% AEP（500年ARI）区域（尽可能使用洪水研究生成的表面数据），以及全市洪水预警地图研究（Worley Parsons, 2012）中提供的剩余0.2% AEP（500年ARI）区域。

小溪极低可能性图层由两部分组合而成：布里斯班市议会洪水淹没范围中（高可能性区域以外）的0.05% AEP（2000年ARI）区域（尽可能使用洪水研究生成的表面数据），以及全市洪水预警地图研究（Worley Parsons, 2012）中提供的剩余0.05% AEP（2000年ARI）区域。