Local scientists, engineers and planners want to get a clearer picture on a less obvious vulnerability that’s becoming more prominent: sea-level induced groundwater rise and its effects on coastal water sources.
Coastal flooding closed several parts of Route 1A in Rye and North Hampton, New Hampshire on Friday, Dec. 23, 2022. Here, at Rye Harbor, a dingy floats up along the road.
“Saltwater is more dense than freshwater, allowing it to move further inland in the deeper geologic materials,” said Knott. Saltwater intrusion can be exacerbated by over pumping freshwater sources. Knott said the way to reduce the likelihood of this is through conserving the water in the aquifers.Brandon Kernen, administrator for the drinking water division of the Department of Environmental Services, said coastal areas don’t have access to many freshwater bodies, which has caused problems to arise in the past for communities such as Hampton and Seabrook.
The studies also predict how much sea level rise will change in the next 25 and 75 years, which can signal how frequently structures need to be maintained in order to weather these changes. Knott said following the conclusion of this vulnerability assessment, they are planning on installing 10 wells near the coast in Portsmouth to monitor how groundwater rises with sea level rise. They’ll also be measuring for increases in salinity over time.
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