![]() Scientists and engineers frequently use statistical probability (chance) to put a context to floods and their occurrence. Because the 1-percent AEP flood has a 1 in 100 chance of being equaled or exceeded in any 1 year, and it has an average recurrence interval of 100 years, it often is referred to as the "100-year flood". The 1-percent AEP flood was thought to be a fair balance between protecting the public and overly stringent regulation. In the 1960's, the United States government decided to use the 1-percent annual exceedance probability (AEP) flood as the basis for the National Flood Insurance Program. Likely lots of "100-year flooding" was happening. Large-scale flooding was occurring in December 2015. So what is a 100-year flood and how is it determined? Trying to place contextual framework around floods is where such terms as "100-year flood" came into being. Placing floods in context allows society to address such issues as the risk to life and property, and to study and understand the environmental benefits of floods. Because floods result from many different circumstances, not all floods are equal in magnitude, duration, or effect. Floods occur for many reasons, such as long-lasting rainfall over a broad area, locally intense thunderstorm- generated rainfall, or rapid melting of a large snow pack with or without accompanying rainfall. Ī flood is any relatively high streamflow overtopping the natural or artificial banks in any reach of a stream. #100 year flood fullYou can see Robert's full poster explaining the concept of the 100-year flood at. Robert Holmes, USGS's National Flood Program Coordinator, offers up the following explanation of the 100-year flood that we can all understand. The USGS conducts research on the physical and statistical characteristics of flooding, estimating the probability of flooding at locations around the United States and attempting to understand how the frequency of flooding changes with urbanization, climate variability, and other factors The term " 100-year flood" is often used to describe a flood of great magnitude. Geological Survey (USGS), but to most of the population of the United States. Visit Media to see details.Īrea about 0.65 mile southwest of USGS streamflow-gaging station 08069500, West Fork of the San Jacinto River near Humble, Texas, August 30, 2017.Ĭredit: Steve Fitzgerald, Harris County Flood Control District.įlooding and high water are of major interest not only here at the U.S. Sources/Usage: Some content may have restrictions. ![]()
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