Sea Level Rise

A major new study says federal flood maps have far underestimated how many properties in New Hampshire and nationwide are at risk from substantial flooding, now and in the coming decades.

The report, out Monday, comes from a range of academic institutions and the nonprofit First Street Foundation.

State officials are using federal money to look at how rising seas will threaten major highways and connecting routes on the Seacoast.

The project, funded by the National Oceanic and Atmospheric Administration, will build a "vulnerability assessment" for the I-95, Route 1 and Route 1A corridors, and local connector roads, including Routes 101 and 286.

Unusually high king tides on parts of the Seacoast may cause flooding in the next few days.

The colloquial term refers to unusually high tides, over 10 feet on the Seacoast.  A series of those high tides are forecast through Wednesday. This can cause minor flooding on streets that border tidal areas, in towns like Hampton.

On Sunday, the beach town was also hit with rain and gusty winds. The tide inundated the back marsh of Hampton Beach, pushing some low-level flooding onto some streets.

A new state report says rising seas are on track to cause widespread problems in New Hampshire's coastal communities within decades.

Now, regulators want public input on how the latest scientific findings could guide local resilience planning in the future.

At town meeting in Hampton Tuesday, residents could take another big step in adapting to rising seas.

Voters will decide whether to require pilings under new structures in certain at-risk coastal areas.

Last weekend's winter storm caused only moderate flooding on New Hampshire's Seacoast. But it provided a window into how rising seas will make flooding more frequent, bringing challenges to the state's coastal communities.

A new report says sea level rise has already cost New Hampshire more than $15 million in coastal property valuation in recent years.

Researchers from Columbia University and the First Street Foundation, a national nonprofit, analyzed 2.5 million coastal homes in four New England states.

State legislators will consider how to prepare New Hampshire for the effects of climate change this session – including with one bill that would help coastal towns facing rising seas.

Seacoast-area state Senator David Watters spoke at the Seacoast Environmental Film Festival Saturday, after a documentary about sea level rise on the Chesapeake Bay.

Hundreds of people rallied for action on climate change in Keene and Portsmouth this weekend.

They were part of demonstrations nationwide, ahead of a global climate summit in San Francisco this week.

Seacoast families and students filled Portsmouth's Market Square with electric vehicles and signs denouncing fossil fuels and President Trump’s climate policies.

They listened as mock-time travelers told stories from two potential futures. One came after inaction on climate in the present day:

Local water regulators from around the state will be in Concord on Thursday to talk about risks facing New Hampshire's drinking water system.

The state organizes the annual conference, focused on sustaining and protecting the state’s groundwater, with the American Ground Water Trust, a national nonprofit based in Concord.

The group’s executive director, Andrew Stone, says New Hampshire relies more on private or community wells than almost any other state – which makes safeguarding water supplies tricky.

The New Hampshire Department of Environmental Services is offering grants to coastal communities looking to better prepare for the effects of climate change.

A total amount of $200,000 is available to towns, state agencies, and private groups.  

Winning projects in the past have included everything from infrastructure projects, to flood plain studies, to educational outreach programs.

On the Seacoast, crews are working to repair damage from winter storms in time for the summer tourist season.

At North Hampton State Beach, repairs are being made to a collapsed parking lot and sidewalk.

New research from UNH says nuisance flooding of roads on the East coast has increased by 90 percent over the last two decades.

Nuisance flooding occurs as a result of normal tidal activity. It's the kind of flooding that can happen on sunny day with calm weather.

The new report estimates that nuisance flooding is already causing over 100 million hours of delays for drivers each year. As oceans rise, the report says, so could that number.

By the end of this century, scientists predict the ocean on New Hampshire’s coast will rise anywhere between 4 and 6.5 feet above where it is today—a consequence of climate change. But when the sea rises, groundwater rises to keep up. That would spell trouble for roadways, even roads inland from the ocean, according to a new study from UNH.

Michael Sununu, brother to Gov. Chris Sununu, is criticizing the science behind a recent bipartisan state report on the impact of climate change on the Seacoast.

In a 25 page critique, Michael Sununu calls the Coastal Risks and Hazard Report “alarmist hand wringing” that would lead to wasteful spending of public money.