GIS Event Calendar

Sea Level Rise in Coastal NH

Lead Agency:
Earth Systems Research Center

Primary Contact:
Cameron Wake

Start Date - End Date
01/01/2011 - 12/30/2012

The text below is modified and updated from the Sea Level Rise chapter in: Wake et al. (2011) Climate Change in the Piscataqua/Great Bay Region: Past, Present, and Future.

Sea Level Rise in Coastal NH

The results of the analysis discussed in detail below indicate that we can expect the 100-year flood elevation at Fort Point in New Castle, NH to increase from a current elevation of 11.2 feet to a range of 12.4 to 13.1 feet by 2050, and to a range of 14.0 to 17.8 feet by 2100. Therefore, even under low greenhouse gas emissions scenarios, we can expect the 100-year flood elevation to increase several feet over the next 90 years. This increase in the 100-year flood elevation will result in more severe flooding in coastal New Hampshire in the future.

To illustrate the impact of the higher 100-year flood elevations in the future, we have produced a series of ten maps that cover the NH seacoast, Piscataqua River, and Great Bay. These maps show stillwater flood depths over land for flood elevations of six feet, nine feet, and twelve feet above mean higher high water (MHHW). (MHHW is the average of the higher high water elevation of each tidal day; values are provided by NOAA.)

These maps are based on detailed LiDAR (Light Detection and Ranging) topographic data that was collected during the spring of 2011. Note that the maps are provided for discussion and research purposes only. It is not appropriate to use the maps for detailed analysis (i.e., at the parcel level). Please contact Cameron Wake at Climate Solutions New England for additional information on methodology and limitations.

Further, note that the map files are large - ranging from 27-32Mb.

Project SummaryDocument (.doc, .pdf)
GreatBaySLR_Dover_06ft_600dpiProject Map
GreatBaySLR_Dover_09ft_600dpiProject Map
GreatBaySLR_Dover_12ft_600dpiProject Map
GreatBaySLR_Durham_06ft_600dpiProject Map
GreatBaySLR_Durham_09ft_600dpiProject Map
GreatBaySLR_Durham_12ft_600dpiProject Map
GreatBaySLR_Exeter_06ft_600dpiProject Map
GreatBaySLR_Exeter_09ft_600dpiProject Map
GreatBaySLR_Exeter_12ft_600dpiProject Map
GreatBaySLR_GreatBay_06ft_600dpiProject Map
GreatBaySLR_GreatBay_09ft_600dpiProject Map
GreatBaySLR_GreatBay_12ft_600dpiProject Map
GreatBaySLR_Hampton_06ft_600dpiProject Map
GreatBaySLR_Hampton_09ft_600dpiProject Map
GreatBaySLR_Hampton_12ft_600dpiProject Map
GreatBaySLR_Kittery_06ft_600dpiProject Map
GreatBaySLR_Kittery_09ft_600dpiProject Map
GreatBaySLR_Kittery_12ft_600dpiProject Map
GreatBaySLR_Newington_06ft_600dpiProject Map
GreatBaySLR_Newington_09ft_600dpiProject Map
GreatBaySLR_Newington_12ft_600dpiProject Map
GreatBaySLR_Portsmouth_06ft_600dpiProject Map
GreatBaySLR_Portsmouth_09ft_600dpiProject Map
GreatBaySLR_Portsmouth_12ft_600dpiProject Map
GreatBaySLR_Rye_06ft_600dpiProject Map
GreatBaySLR_Rye_09ft_600dpiProject Map
GreatBaySLR_Rye_12ft_600dpiProject Map
GreatBaySLR_Seabrook_06ft_600dpiProject Map
GreatBaySLR_Seabrook_09ft_600dpiProject Map
GreatBaySLR_Seabrook_12ft_600dpiProject Map

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