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The outdated analysis has serious implications for the way infrastructure projects are initiated and designed.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 22, 2020
New version of IAPMO’s Water Demand Calculator is available
Enhanced features include selection between single- and multifamily buildings.
Codes and Standards | Jul 22, 2020
Mobile app calculates sound transmission for wood-framed assemblies
American Wood Council tool for floor-ceiling assemblies.
Codes and Standards | Jul 22, 2020
Architecture billings remain in negative territory, begin to stabilize
Fewer architecture firms report declining billings this month.
Codes and Standards | Jul 20, 2020
N.Y. construction firm to pay $1.5 million to settle sexual harassment claim
Managers said to demand sex for pay and OT opportunities.
Codes and Standards | Jul 16, 2020
Tips to make optimal use of salvaged materials
Integrated teams, staging warehouse, and looking early and often, among recommendations.
Codes and Standards | Jul 15, 2020
Georgia gives the go-ahead for tall mass timber construction
Standards review scheduled to be completed by July 2021.
Codes and Standards | Jul 15, 2020
Softwood-lumber duties boost expenses amid COVID-19 outbreak
Little hope this year for resolution of trade dispute with Canada.
Codes and Standards | Jul 14, 2020
Metal Construction Assn. releases three EPD updates
Pertain to Metal Composite Materials, Insulated Metal Panels, and Roll Formed Aluminum and Steel Cladding.
Codes and Standards | Jul 13, 2020
5 must reads for the AEC industry today: July 13, 2020
4 technologies for improving building sanitation and tech's ever-evolving impact on the multifamily space.
Codes and Standards | Jul 9, 2020
Funding opportunity for field validation of high-impact building technologies
Dept. of Energy program targets dynamic interactions with electric grid.
