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One-fourth of the state’s land — roughly 67,000 square miles — either falls within the 100-year floodplain or the 500-year floodplain, according to the plan.
However, a June 2007 update floodplain map now indicated most of the facility was inside of 100-year floodplain, including the storage warehouses, backup generators and electrical transformers for commercial power. A smaller area of the facility was within the 500-year floodplain. [3] The organic peroxides are stored in nine storage buildings ...
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 ...
In all, there are 655 structures within the 100-year floodplain. Most of the watershed, 71%, was developed before the 1991 Urban Watersheds Ordinance regulations. There are 54 roadways within the 100-year floodplain with 46 inundated by the 100-year, 41 inundated by the 25-year, 35 inundated by the 10-year, and 11 by the 2-year floods. [1] [note 2]
In April 2016, Houston, Texas was flooded with over one foot of rain in 24 hours. [68] The event was termed "the Tax Day flood" and pushed local creek and reservoir levels to new records. Until Hurricane Harvey in 2017, this was the worst flooding Houston had seen since 2001's Tropical Storm Allison. [69]
The October 1998 Texas Flooding was a flood event that occurred across parts of South Texas and Southeast Texas on the weekend of October 17 and October 18, 1998. The storm that caused it was one of the costliest in the recorded meteorological history of the United States, bringing rainfall of over 20 inches (510 mm) to some parts of Southeast Texas and causing over $ 1.19 billion in damages ...
According to officials from the Harris County Flood Control District, Harvey caused the third '500-year' flood in three years. [146] [147] [148] The National Climate Assessment states: The recent increases in activity are linked, in part, to higher sea surface temperatures in the region that Atlantic hurricanes form in and move through.
In some areas, the multi-month rainfall was a 100-year or 1000-year flood. I think something that's both profound and underappreciated: 1993 is STILL the most costly US flood*. The margin is ...