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On May 30, because of continued rain, the U.S. Army Corps of Engineers increased the outflow from the Coralville Reservoir to 14,000 cubic feet per second, leading Iowa City to declare a civil emergency and forcing the closure of low-lying portions of North Dubuque Street, a major route for commuter traffic into Iowa City. [27]
FIRMs display areas that fall within the 100-year flood boundary. Areas that fall within the boundary are called special flood hazard areas (SFHAs) and they are further divided into insurance risk zones. 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 ...
Hurricane Harvey was a devastating tropical cyclone that made landfall on Texas and Louisiana in August 2017, causing catastrophic flooding and more than 100 deaths. It is tied with 2005's Hurricane Katrina as the costliest tropical cyclone on record, [nb 1] inflicting $125 billion (2017 USD) in damage, primarily from catastrophic rainfall-triggered flooding in Greater Houston and Southeast ...
Updated maps from Williamson County show an increase of 6,000 structures in the 100-year flood plains. The last information available was from 1994.
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 Des Moines River at Humboldt, a small city about 105 miles north of Des Moines, was forecast to crest Wednesday at 17 feet, more than a foot higher than its record in 1969, according to the ...
In 2011, Waverly completed the construction of a 4.3 million dollar inflatable dam. The dam is designed to protect more than 400 homes and businesses in the event of a 100-year flood and will provide relief in 500-year flood events such as 2008. [44]
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.