The way the federal government analyzes intense rain events isn’t keeping up with the reality of climate change, and that has serious implications for infrastructure projects and the availability of, and rising cost of, flood insurance.
Severe rainstorms, sometimes described as “atmospheric rivers” or “torrential thunderstorms,” are making the concept of a “1-in-100-year flood event” obsolete, according to a report from First Street Foundation, an organization focused on weather risk research.
These events are occurring more frequently due to the impact of climate change, but federal rainfall analysis, managed by the National Oceanic and Atmospheric Administration, isn’t keeping up with the new weather conditions, First Street says.
Half the people in the U.S. live in a county where a 1-in-100-year flood is at least twice as likely now as it had been in the past, coming once every 50 years instead of every 100 years. In some areas, a so-called “1-in-100-year” rainfall could now happen far more frequently—as often as every 5 to 10 years.
The outdated analysis has serious implications for the way infrastructure projects are initiated and designed. And, because FEMA’s federal flood insurance program greatly underrepresents the number of people that could fall into FEMA’s Special Flood Hazard Areas, millions of Americans may be unaware of their current flood risk.
Inaccurate flood risk data due to underestimating the impact of rainfall also impacts the cost and availability of flood insurance—this is especially true for property that isn’t close to the ocean or inland bodies of water.
The government is working to remedy the situation, though. NOAA, as reported by CNN, says it is working on a revamped approach to its rainfall analysis that is expected to be completed in 2027.
Related Stories
Codes and Standards | Jul 26, 2017
New ISO standard on video fire detectors will help identify fires more quickly
The standard marks the first comprehensive international specification for this equipment.
Codes and Standards | Jul 25, 2017
Geotechnical solutions prevent building distress due to expansive clay soils
The condition is the most common geologic hazard in the U.S.
Codes and Standards | Jul 24, 2017
Non-union labor gaining ground in New York City
President of contractors’ group says competitive pricing is spurring more open shops.
Codes and Standards | Jul 20, 2017
New tallest tower west of the Mississippi built to stringent seismic standards
L.A.’s new 1,100-foot skyscraper dominates city’s skyline.
Codes and Standards | Jul 20, 2017
Chicago rises to the top of U.S. cities in percentage of LEED or Energy Star office buildings
Certified office buildings reach 66% in windy city.
Codes and Standards | Jul 19, 2017
Economic impacts of climate change will jump over next two decades
Average annual cost to buildings and infrastructure from eastern storms to rise by $7.3 billion.
Codes and Standards | Jul 18, 2017
Energy modeling yields accuracy within 4%, says new study
Results of the study support the usefulness of the practice.
Codes and Standards | Jul 13, 2017
Net Zero Energy rebranded as ‘Zero Energy’
ILF aims to make new certification the sole standard for highest performing buildings.
Codes and Standards | Jul 13, 2017
New York City creates $10 million fund to help women- and minority-owned firms win construction contracts
The money is earmarked for up to $500,000 surety bonds per contract.
Codes and Standards | Jul 12, 2017
New International Building Code allows weather-resistive barriers above 40 feet
Danger of propagating flames now deemed negligible.