Research Finds Dramatic Increase in Flooding on Coastal Roads

news image
Special Stories
12 Apr 2018 8:47 AM
[Driver ventures down flooded road made nearly impassable by coastal flooding in Rye, N.H. Photo credit: Kim Reed] From UNH High tide floods, or so-called “nuisance flooding,” that happen along shore roadways during seasonal high tides or minor wind events are occurring far more frequently than ever before. Researchers at the University of New Hampshire have found that in the past 20 years roads along the East Coast have experienced a 90 percent increase in flooding – often making the roads in these communities impassable, causing delays, as well as stress, and impacting transportation of goods and services. “This could be just the beginning of impact on these areas,” said Jennifer Jacobs, professor of civil and environmental engineering. “With the continued rise in sea levels, nuisance-flood frequency is projected to grow and the effect on the physical roads and the people that live along the coastline is concerning.” [Damaged infrastructure closes road along Rye Beach in Rye, NH after coastal storm in March, 2018. Photo Credit: Kim Reed] In their study, recently published in the journal Transportation Research Record, the researchers found that tidal nuisance flooding threatens over 7,500 miles of roadways along the entire East Coast, with over 400 miles of that being interstate roads. They estimate that this causes over 100 million hours of delays each year for drivers on those roads and that number could rise to more than 3.4 billion hours by 2100. “As tidal coastal flooding increases in the coming years, there will also be issues with the transportation infrastructure,” said Jacobs. “We’ve already seen billions of dollars in damage to coastal roadways from recent hurricanes. In the future, with rising sea levels, we expect to see more frequent issues, more damage, and impact to roadways even farther inland.” [Flooded roads around Prescott Park in Portsmouth, N.H. after coastal storm in March, 2018. Photo credit: Melissa Paly] Researchers note that these impacts are not limited to storm events. They say that critical transportation infrastructure is at risk from sea level rise alone; which numerous transportation agencies project to be between one to eight feet, along the U.S. Atlantic and Gulf Coasts. The researchers say that the goal of this study is to better understand the type and extent of roadway infrastructures that are vulnerable to high tide flooding and the transportation impacts now and in the future due to sea level rise. This study focuses on the East Coast of the United States and includes all coastal states from Maine to Florida, including the Gulf Coast of Florida and Key West. [Roads closed due to high tide floods in Portsmouth, N.H. Photo credit: Lisa Graichen/UNH] Vulnerable roads were identified using data from the Federal Highway Administration’s Highway Performance Monitoring System and National Oceanic and Atmospheric Administration’s Center for Operational Oceanographic Products and Services. They looked at flood frequency maps, tidal gauge historic observations, and future projections of annual minor tidal flood frequencies and durations. [Ocean Boulevard in Hampton, N.H. is closed due to high tide flooding after coastal storm in March, 2018. Photo credit: Kim Reed] Edited for WeatherNation by Meteorologist Mace Michaels
All Weather News
More
Heat Alerts Expanding Across the Western U.S.

Heat Alerts Expanding Across the Western U.S.

A stagnant ridge of high pressure has led to

21 Jul 2024 3:10 AM
60 MPH Gusts Blast the Great Plains, Storms Continue

60 MPH Gusts Blast the Great Plains, Storms Continue

An upper-level low diving through the Plains

21 Jul 2024 3:00 AM
Soggy Days Ahead For the South

Soggy Days Ahead For the South

A stalled out front is going to keep the next

21 Jul 2024 3:00 AM
Saharan Dust Arrives in the South This Weekend

Saharan Dust Arrives in the South This Weekend

Conditions are quiet in the tropical Atlantic

21 Jul 2024 2:45 AM
24 Tornadoes Confirmed by NWS, Most in Single Day

24 Tornadoes Confirmed by NWS, Most in Single Day

The National Weather Service (NWS) in Chicago

21 Jul 2024 1:30 AM
New Aircraft Set to Join Hurricane Hunter Fleet

New Aircraft Set to Join Hurricane Hunter Fleet

Artist's concept of the NOAA Gulfstream G550.

21 Jul 2024 1:00 AM
June Weather Recap: Active Start to the Summer

June Weather Recap: Active Start to the Summer

If you had the feeling the start of the summe

20 Jul 2024 9:00 AM