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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.
The earliest floodplain map located in the Chemical Safety Board investigation, was from September 1985, and indicated the plant was in "Zone C - Area of Minimal Flooding". A November 1996 update to the floodplain map, placed most of the facility into "Other Areas - Zone X - Areas determined to be outside the 500-year floodplain".
Two-thirds of the bayous and creeks in Harris County experienced 500-year flood events. Houston Intercontinental Airport, which typically receives 46.07 inches (1,170 mm) of rain in a year, experienced 35.7% of its expected total in the first nine days of June. [1] The deluge flooded 95,000 automobiles and 73,000 houses throughout Harris County ...
The state’s flood plan shows which Texans are most at risk of flooding and suggests billions of dollars more are needed for flood mitigation projects. Texas’ first-ever statewide flood plan ...
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. FIRMs are ...
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]
High risk days like this only happen on 4% of days each year, but account for more than 80% of all flood damage and more than a third of all flood deaths in the United States, according to the WPC.
A flood watch had been in effect for Houston until 7 p.m. Friday but was extended into Sunday afternoon, the National Weather Service in Houston said in a post on X. An additional 1 to 3 inches of ...