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The outdated analysis has serious implications for the way infrastructure projects are initiated and designed.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 | Nov 9, 2016
Louisiana flood projections require urgent action, officials say
The 'no net loss’ prediction now seems unrealistic.
Codes and Standards | Nov 8, 2016
American Concrete Institute offers new guide for repair of concrete buildings
The guide provides assistance on assessment and rehab.
Codes and Standards | Nov 7, 2016
The AISC prequalified seismic moment connection standard is now available
You can download the 2016 version for free.
Codes and Standards | Nov 4, 2016
Obama Administration makes a push for denser, more affordable cities
The administration calls for zoning code changes and other measures to create more housing.
Codes and Standards | Nov 3, 2016
OSHA proposes safety standards changes to reduce employer costs
The changes include clarification on excavation standard and reporting job-related hearing loss.
Codes and Standards | Nov 2, 2016
New resources available to reduce plug loads using advanced power strips
A tenant education program can boost efficiency in office buildings.
Codes and Standards | Oct 26, 2016
Design industry lagging in meeting AIA 2030 Commitment goals, says AIA
Only 4% of projects have met the 70% energy savings target.
Codes and Standards | Oct 25, 2016
Concerns over megaquake in Oregon provoke debate over school building standards
According to advocates, communities should consider increased resiliency.
Codes and Standards | Oct 24, 2016
Building energy codes projected to save $126 billion in energy costs from 2010-2040
Commercial and residential structures are both included in the total.
Codes and Standards | Oct 24, 2016
Fall hazards, hazard communication lead 2016 OSHA top violations
The 2016 list bears a strong resemblance to the 2015 list.