Why calgary flood happened

Most significant is a large amount of rainfall — up to millimetres in some places. Add in ground that is already saturated because of some more modest precipitation — about 40 millimetres — preceding the deluge. Combine that with areas that were still frozen not far below the surface and a local geography that encourages water to run down hill quickly, and there's a recipe for this week's devastation. In the case of Calgary, they arrived fairly quickly.

The deluges were the result of some unusual weather. Along with the torrents of rain, there were unexpected wind patterns and the convergence of two huge weather systems.

Some of the hardest-hit areas have experienced twice as much rain in 48 hours than the normal average for all of June. On June 20, Calgary experienced record one-day rainfall with 45 millimetres coming down.

Understanding river flow rates The Bow and Elbow Rivers can look very different throughout the year. Flooding in some streets and parks. Evacuation may begin. View our flood maps to see which areas would be affected. Flooding type Highest risk season Cause Impacts River Flooding Mid-May to mid-July Heavy rainfall in the mountains and foothills combined with snow melt which drains into our rivers.

Flooding happens quickly and with little warning because of the short, steep distance the rivers travel from the mountains to Calgary.

Local stormwater flooding Summer Thunderstorms over Calgary Rain water may flow through streets, or pool in low spots until it can drain into the stormwater system.

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How easy is it to find or access information? What was the main area of Calgary. On June 15, Environment Canada downgraded its emergency level for the northern area of the province to a flood watch rather than a warning; the evacuation order had been in place for seven days.

Within the coming days of the predicted flood warnings, around 80, people had to be evacuated from their homes and businesses. Heide Pearson takes a look by the numbers. In the years since the disaster, Calgary has conducted many repairs and flood prevention projects. Swipe below to see an aerial image of downtown Calgary during and after the June flooding.

Swipe below to see an aerial image of the Glenmore Dam during and after the June flooding. Swipe below to see an aerial image of the Safeway in Mission during and after the June flooding. Swipe below to see an aerial image of the Stampede grounds during and after the June flooding. World Canada Local. Full Menu Search Menu.