1:20 Flood Map (5% chance of occurring in any year)

(Note: Updated inundation maps for 1:2 to 1:1000 floods are available from Alberta Environment and Parks (2020). The new draft maps can be viewed here: https://floods.alberta.ca/?app_code=FI&mapType=Draft)
These inundation maps show whether a property is at risk for various sized river floods. The size of flood shown on this map has a 1/20 or a 5% chance of occurring in any year.
The three distinct types of inundation shown on the maps are:
o Inundation - Area flooded overland due to riverbank overtopping.
o Isolated - Low lying areas that will not be wet from riverbank overtopping, but may experience groundwater seepage or stormwater backup.
o Protected - Area protected by a permanent flood barrier.
The flood areas shown are based on Alberta Environment and Parks most recent (2020) inundation maps. There is uncertainty inherent in predicting the effects of flood events, and this uncertainty increases for floods with less than a 1% chance of occurrence in any year. Any use of this data must recognizing the uncertainty with regards to the exact location and extent of flooding.
More information on flood mapping for Calgary is available at https://calgary.ca/flood
For Calgary's River Flood story, see: https://maps.calgary.ca/RiverFlooding/

（注：阿尔伯塔省环境和公园部（2020年）更新了1:2至1:1000洪水淹没图。新的草案地图可在此查阅：https://floods.alberta.ca/?app_code=FI&mapType=Draft。）本组淹没图揭示了财产遭受不同规模河流洪水风险的情况。本图所展示的洪水规模，在任意一年内发生的概率为1/20或5%。地图上所呈现的三个不同类型的淹没情况如下：

o 淹没 - 由于河岸溢出而造成陆地淹没的区域。
o 孤立 - 低洼地区，即使河岸溢出也不会被淹没，但可能经历地下水渗透或暴雨积水倒灌。
o 受保护 - 由永久性洪水防护设施所保护的区域。
所示洪水区域基于阿尔伯塔省环境和公园部最新的（2020年）淹没图。预测洪水事件的影响存在固有不确定性，且这种不确定性在任意一年发生概率低于1%的洪水情况下加剧。使用本数据时，必须认识到关于洪水确切位置和范围的预测存在不确定性。
有关卡尔加里的洪水测绘信息，请参阅https://calgary.ca/flood。
有关卡尔加里的河流洪水故事，请访问https://maps.calgary.ca/RiverFlooding/。