Assessing the Risk of 100-Year Freshwater Floods in the Lamprey River Watershed of New Hampshire Resulting from Changes in Climate and Land Use

This NOAA funded project is assessing flood risk associated with existing and future land use and climate change scenarios for the Lamprey River watershed of Great Bay, New Hampshire to support land use decision-making. Key products include maps at the watershed and municipality scale of the 100-year flood risk boundaries and river discharge at specific locations under selected land use and climate change scenarios.

The project will develop and refine a methodology for assessing flood risk associated with land use and climate change scenarios, implement the methodology for the Lamprey River watershed of Great Bay, NH, and demonstrate the use of associated products to support land use decision-making in coastal communities. The core analyses and outputs for this project will include maps at the watershed and municipality scale of the 100-year flood risk boundaries and river discharge at specific locations under selected scenarios.  As a result, decision-makers and the public within the watershed will have access to new information regarding local flood risk, and they will be educated about how past and potential future land use patterns and climate change will influence the frequency and spatial extent of flooding. 

A complementary project will explore the legal authority, measures and possible consequences associated with the use of new floodplain maps by coastal communities in New Hampshire based on current and projected land use patterns and precipitation amounts. The legal research will be carried out by faculty and students at Vermont Law School (VLS) and integrated with the existing project led and coordinated by a multi- disciplinary team at the University of New Hampshire. The UNH-led team is developing “new” floodplain maps for the Lamprey River basin, a sub-watershed within New Hampshire’s coastal watershed. The mapping project is funded by the NOAA/UNH Cooperative Institute for Coastal and Estuarine Environmental Technology (CICEET).

Publication Date: 2010

Related Organizations:

  • University of New Hampshire

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  • Assessment

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