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The term 100-year flood indicates that the area has a one-percent chance of flooding in any given year, not that a flood will occur every 100 years. [ 2 ] Such maps are used in town planning , in the insurance industry, and by individuals who want to avoid moving into a home at risk of flooding or to know how to protect their property.
Theoretically a 100-year flood has a 1 percent chance (1/100 = 0.01 or 1 percent) of occurring in any given year and a 500-year flood has as a 0.2 percent chance (1/500 = 0.002 or 0.2 percent) of occurring in any given year. [12] However, these expected flood elevations actually occur more or less often than expected. [13]
For river systems, a 100-year flood is generally expressed as a flowrate. Based on the expected 100-year flood flow rate, the flood water level can be mapped as an area of inundation. The resulting floodplain map is referred to as the 100-year floodplain. Estimates of the 100-year flood flowrate and other streamflow statistics for any stream in ...
The Federal Emergency Management Agency (FEMA) created Risk Rating 2.0 to help create more fairly rated flood insurance policies by taking more rating factors into consideration.
Roughly 1 in 200 single-family homes in the region is covered by the National Flood Insurance Program (NFIP), according to a Reuters analysis of federal government data – a far lower level of ...
Previously the Insurance Program created in 1968 was constructed around the "100-year floodplain" which is the "area that would be inundated by the 100-year flood, better thought of as an area that has a one percent or greater chance of experiencing a flood in any single year", [73] and large subsidies for coastal homes, especially in Florida.
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