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Layer: Vulnerable areas (<5 ft GWD) with 1 foot of SLR (0)

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Description: Groundwater modeling was used to simulate the effects of sea-level rise on groundwater levels in the New Hampshire Seacoast. The MODFLOW-USG Transport model (Panday, 2022) was used to simulate groundwater flow and saltwater intrusion in these communities. This map shows vulnerable areas where the groundwater depth is currently less than 5 ft. The colors show the projected magnitude of groundwater rise under 1 ft of sea-level rise. Shallow and surface infrastructure, including pavements in these areas, is the most vulnerable to rising groundwater from sea-level rise and from heavy rainfall events.

Service Item Id: ad22d1f9ed034b018c3f76440171f6e4

Copyright Text: Jayne F. Knott, Ph.D. of JFK Environmental Services LLC and Jennifer M. Jacobs, Ph.D. of Jennifer M. Jacobs & Associates LLC. This work was funded by the NH Department of Environmental Services.

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Layer: Vulnerable areas (<5 ft GWD) with 2 feet of SLR (1)

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Description: Groundwater modeling was used to simulate the effects of sea-level rise on groundwater levels in the New Hampshire Seacoast. The MODFLOW-USG Transport model (Panday, 2022) was used to simulate groundwater flow and saltwater intrusion in these communities. This map shows vulnerable areas where the groundwater depth is currently less than 5 ft. The colors show the projected magnitude of groundwater rise under 2 ft of sea-level rise. Shallow and surface infrastructure, including pavements in these areas, is the most vulnerable to rising groundwater from sea-level rise and from heavy rainfall events.

Service Item Id: ad22d1f9ed034b018c3f76440171f6e4

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Layer: Vulnerable areas (<5 ft GWD) with 4 feet of SLR (2)

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Description: Groundwater modeling was used to simulate the effects of sea-level rise on groundwater levels in the New Hampshire Seacoast. The MODFLOW-USG Transport model (Panday, 2022) was used to simulate groundwater flow and saltwater intrusion in these communities. This map shows vulnerable areas where the groundwater depth is currently less than 5 ft. The colors show the projected magnitude of groundwater rise under 4 ft of sea-level rise. Shallow and surface infrastructure, including pavements in these areas, is the most vulnerable to rising groundwater from sea-level rise and from heavy rainfall events.

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Layer: Vulnerable areas (<5 ft GWD) with 6 feet of SLR (3)

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Description: Groundwater modeling was used to simulate the effects of sea-level rise on groundwater levels in the New Hampshire Seacoast. The MODFLOW-USG Transport model (Panday, 2022) was used to simulate groundwater flow and saltwater intrusion in these communities. This map shows vulnerable areas where the groundwater depth is currently less than 5 ft. The colors show the projected magnitude of groundwater rise under 6 ft of sea-level rise. Shallow and surface infrastructure, including pavements in these areas, is the most vulnerable to rising groundwater from sea-level rise and from heavy rainfall events.

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Layer: Vulnerable areas (<5 ft GWD) with 8 feet of SLR (4)

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Description: Groundwater modeling was used to simulate the effects of sea-level rise on groundwater levels in the New Hampshire Seacoast. The MODFLOW-USG Transport model (Panday, 2022) was used to simulate groundwater flow and saltwater intrusion in these communities. This map shows vulnerable areas where the groundwater depth is currently less than 5 ft. The colors show the projected magnitude of groundwater rise under 8 ft of sea-level rise. Shallow and surface infrastructure, including pavements in these areas, is the most vulnerable to rising groundwater from sea-level rise and from heavy rainfall events.

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Layer: Vulnerable areas (<10 ft GWD) with 8 feet of SLR (9)

Name: Vulnerable areas (<10 ft GWD) with 8 feet of SLR

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Description: Groundwater modeling was used to simulate the effects of sea-level rise on groundwater levels in the New Hampshire Seacoast. The MODFLOW-USG Transport model (Panday, 2022) was used to simulate groundwater flow and saltwater intrusion in these communities. This map shows vulnerable areas where the groundwater depth is currently less than 10 ft. The colors show the projected magnitude of groundwater rise under 8 ft of sea-level rise. Subsurface infrastructure assets, including utilities, are the most vulnerable to rising groundwater from sea-level rise and heavy rainfall events in these areas.

Service Item Id: ad22d1f9ed034b018c3f76440171f6e4

Copyright Text: Jayne F. Knott, Ph.D. of JFK Environmental Services LLC and Jennifer M. Jacobs, Ph.D. of Jennifer M. Jacobs & Associates LLC. This work was funded by the NH Department of Environmental Services.

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