One-Hundred Year (100-Year) Flood
One-Hundred Year (100-Year) Flood :
A 100-year flood is that flood that has a 1% chance of occurrence in any given year; a 500-year flood has a 0.2% chance of occurrence in any given year. However, the occurrence of a 100-year flood in a given year does not mean that a similar or larger flood can not occur in the following year, or even later that same year. As a result of this yearly independence, there is a 26% chance that a 100-year flood will occur or be exceeded within a 30-year period (the life of a typical mortgage). 92 (Galloway, CA Challenge, 2007, 15) One hundred year protection is not an acceptable level of protection for urban areas. (Ibid, 33)
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