Marty Mozzo gets a gorgeous show each night when the sun sets over wetlands near his property on the bay side of a barrier island in New Jersey.
When he and his wife bought the house in 2008, she looked at the marsh, where the only sign of water was a tiny trickle nearly 1km away.
“Do you think this will flood?” she asked.
Illustration: Constance Chou
“How could it?” he replied. “Look how far away the water is.”
Within weeks of moving in, a storm stranded them for two days with water on all sides.
Theirs is one of several neighborhoods in Ocean City, where residents have adopted unofficial flood etiquette: Do not drive too fast through flooded streets or you will create wakes that slam into houses, scatter garbage cans and damage lawns and gardens.
They are among millions of people worldwide whose lives and land are being dampened by back-bay flooding — inundation of waterfront areas behind barrier islands where wind and tides can create flooding during storms or even on sunny days.
It is a type of flooding that tends to be overshadowed by oceanfront storm damage that grabs headlines — and government spending — with dramatic video of crashing waves and splintered houses.
“This insidious flooding is increasing, and it is an important social issue, but it is not getting enough attention paid to it,” said S. Jeffress Williams, a coastal scientist with the US Geological Survey. “Flooding is happening with increasing frequency in back-bay areas. It happens very rapidly; it’s just not as dramatic.”
Williams, who lives on Cape Cod in Massachusetts, said back-bay flooding is happening just as frequently, if not more so, than oceanfront flooding.
“Over the last 15 or 20 years I have seen, especially when you get a full moon and a high tide, roads, backyards and parks all get flooded, much more so than we ever had before,” he said.
Nearly five years after Hurricane Sandy delivered a wake-up call, the problem of back-bay flooding is coming into sharper focus.
Studies are under way, money is starting to flow toward the problem and the realization that destruction of wetlands for development along such shores is partly to blame is leading to discussion about building codes.
Sandy created a vast swath of destruction along the coasts of New Jersey and New York in 2012, but it also wreaked havoc along the back bays, where lagoons exposed thousands of waterfront homes to flooding damage.
Property owners in Toms River, New Jersey, received more than US$568 million in payments from the US Federal Emergency Management Agency after Sandy.
Neighboring Brick Township received more than US$267 million.
Both towns have limited oceanfront exposure, but extensive back-bay exposure, and they represented the largest damage totals in Ocean County, the region of New Jersey that took the hardest hit from Sandy.
US President Donald Trump’s budget proposal would cut a combined US$452 million from the US National Oceanographic and Atmospheric Administration (NOAA) and US Homeland Security for research grants, flood mapping and analysis.
If enacted by the US Congress, less money will be available to study back-bay flooding, many environmentalists say.
Jeff Gebert, chief of coastal planning for the US Army Corps of Engineers Philadelphia Division, acknowledged that before Sandy, back-bay flooding was not as high on the agency’s radar, due in part to the lack of easy engineering solutions.
As of January, the Army Corps map of recent storm protection and navigation projects in New Jersey showed 10 either completed or under way, with six more planned.
However, none were done in back bays.
The picture is largely the same nationwide, “because the solution to back-bay flooding is much more complicated” than simply pumping sand onto oceanfront beaches, he said.
A 2010 study by the NOAA found that more than 123 million people — or about 39 percent of the US population — lived in coastal zone counties, a number projected to grow by 8 percent by 2020.
The greater proportion of those people live on or near the bay sides of barrier islands than on the oceanfront, scientists say.
Unlike oceanfront flooding, where crashing waves from storm-driven seas pound the beaches, back bays flood gradually and comparatively quietly as water levels rise. The effect is worsened during storms that continue through numerous tide cycles in which water piles up in the back bays without being able to drain out to sea.
Tides and wind can inundate some of these areas even when the sun shines.
“The water sneaks up the backside of barrier islands and the flooding you get is sometimes actually greater than on the ocean sides due to the topography of the islands,” said Guy Nordenson, a structural engineer specializing in climate change adaptation whose firm has worked with the Army Corps on flood prevention projects. “That is the case all the way up and down the East Coast to Miami Beach.”
New Jersey has funded some smaller resiliency projects in areas including back bays, but none was designed specifically for flood control.
It hopes that the study under way will identify a range of possible solutions.
Sandy “woke people up,” Gebert said. “It galvanized attention on the vulnerability of back bay areas.”
The Army Corps and state officials began a three-year study of back-bay flooding in New Jersey in December last year that seeks cost-effective solutions that can be replicated elsewhere. Similar studies are under way or were recently completed in New York, Virginia, Texas, Connecticut, Rhode Island, Maryland, as well as in Washington DC.
Many traditional engineering solutions that are used along the oceanfront are of limited benefit against back-bay flooding.
Houses are being elevated and roadways repaved to make them higher. However, the bulkheads, sea walls and sand dunes used along the ocean can not be replicated in many back-bay areas because of limited space and resistance from homeowners who prize waterfront views.
“There’s just not as much you can do,” Williams said. “We used to have broad wetlands that could absorb this water, but we’ve built right up to the edge of the water in many places. Now you’re faced with armoring the waterfront or relocating, and relocating is popular with no one.”
Any new homes need to be built in these areas with sea level rise in mind, Princeton professor of geosciences Michael Oppenheimer said.
“They need to design buildings that are essentially floodable, where it’s OK that the first floor gets flooded every now and again,” he said. “These places do get wet on a regular basis.”
Globally, sea levels have been rising over the past century, the NOAA said, adding that the rate has increased in recent decades.
In New Jersey, seas have risen by 0.4m over the past 100 years, said Benjamin Horton, a Rutgers University professor and leading expert on climate change and sea level rise.
That is a faster pace than for the past 2,000 years combined, he said.
Horton and other Rutgers researchers project that by 2050, seas off New Jersey will rise by an additional 40cm.
Jim and Maryann O’Neill moved from Philadelphia to a section of Stafford Township, New Jersey, in 1994 for a quiet life near the water, but they are now much nearer to it than they bargained for.
In January last year, a coastal storm inundated the O’Neills’ neighborhood; a March storm submerged the roads and deposited fish on the pavement in front of their house. That was two years after the town raised the road by their house by 20cm.
They have had to build a boardwalk from their back stairs to the edge of their property because the yard has been under water or muddy — “like quicksand,” said Jim O’Neill — virtually every day for the past five years.
Maryann, 75, recently learned how to use an app that notifies her when the tides are rising.
The O’Neills routinely have to move their car to the highest spot around — the bridge leading to their neighborhood. They have already rusted through three pickup trucks and three cars in the past 13 years.
In Ocean City, officials are to spend US$40.3 million over the next five years on drainage improvements and road work that includes elevating roadways, new pipes and pumping stations.
Such work in his neighborhood has cut down on flooding, Mozzo said.
“We put [US]$20 million into back-bay dredging for five years,” Ocean City Mayor Jay Gillian said. “When you talk about [US]$20 million in one seaside resort for just one thing, that speaks volumes about how much these coastal places need.”
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