GEOG 3020 Lecture Notes - Lecture 7: 100-Year Flood, Avoiding Dangerous Climate Change, Flood Insurance
10 Aug 2019
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Another way to think of this is through the use of a risk matrix", which you may consider using to organize your information for your group assignment (more on this later): Let"s apply this to flooding events, starting with the probability of occurrence" dimension. When we say that an area experienced a 100 year flood", we are referring to a flooding event that we would expect to happen once every 100 years. In other words, this event has a 1% chance of occurring in any given year. In reality, many regions experience 2 or 3 such floods in a 100-year period. Of course, 50-year floods and 10-year floods, also common terms, happen more frequently (2% and 10% chance, respectively, of occurring in any given year). As the ipcc state in their summary, climate change will mean that some regions are likely to experience a. 100-year flood more often (while others will experience a 100 year drought more often).
