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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.
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 ...
As a result of its familiarity with flooding, Alief was home to the region's first flood control district, which was created in 1909. [5] 1925 view of Brays Bayou looking north. The forested area is today the Texas Medical Center. Rice University and Memorial Hermann Hospital can be seen at the top left, and Hermann Park can be seen at the top ...
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Buffalo Bayou is a slow-moving river which flows through Houston in Harris County, Texas.Formed 18,000 years ago, it has its source in the prairie surrounding Katy, Fort Bend County, and flows approximately 53 miles (85 km) east through the Houston Ship Channel into Galveston Bay and the Gulf of Mexico. [2]
This is significantly higher than the 35 inches of precipitation that the area typically receives in an entire year. In some areas, the multi-month rainfall was a 100-year or 1000-year flood .
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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]
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