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You should educated yourself and understand what designation
Posted on: August 30, 2017 at 14:33:30 CT
Salty Dog MU
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How often does a 100-year flood occur?
You have likely heard references to 20, 100, 500 (etc) year flood plains. Do you know what that really means? A 100-year flood does not mean that such a flood is likely to occur every 100 years; rather, it means that there is a one in one-hundred (or 1%) chance of such a flood occurring in any given year.
Two 100-year floods could occur two years in a row, or a month apart, depending on how much rain is falling or how much snow falls & how quickly it melts. A 20-year flood would have a one in twenty (or 5%) chance of occurring in a particular year. A 500-year flood has a one in 500 (0.2%) chance of occcurring.
Likely the 500 year flood would be more catastrophic than the 100 year flood, which would be more catastrophic than the 20 year flood, etc.
How often does a 100-year flood occur?
You have likely heard references to 20, 100, 500 (etc) year flood plains. Do you know what that really means? A 100-year flood does not mean that such a flood is likely to occur every 100 years; rather, it means that there is a one in one-hundred (or 1%) chance of such a flood occurring in any given year.
Two 100-year floods could occur two years in a row, or a month apart, depending on how much rain is falling or how much snow falls & how quickly it melts. A 20-year flood would have a one in twenty (or 5%) chance of occurring in a particular year. A 500-year flood has a one in 500 (0.2%) chance of occcurring.
Likely the 500 year flood would be more catastrophic than the 100 year flood, which would be more catastrophic than the 20 year flood, etc.
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You should educated yourself and understand what designation - Salty Dog MU - 8/30 14:33:30