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. You can see Robert's full poster explaining the concept of the 100-year flood at.
Karl Winters, 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.
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