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About the Coastal NH Floodplain Mapping Project

An overview of the Coastal NH Floodplain Mapping Project, summary of the project's history, and the project's partners.

Coastal NH's current FEMA flood hazard data for the Atlantic Coast and Great Bay watershed dates back to the 1970s and 1980s and no longer accurately represents the area's flood risk. Drainage patterns have changed due factors such as to land use, surface erosion, and other natural forces. As a result, the likelihood of flooding in some areas has increased significantly.

Moreover, the technology used to estimate flooding has improved. Up-to-date maps will more accurately represent the risk of flooding; therefore, representing an important tool for Coastal NH communities to use in the effort to reduce risk and create a more resilient community.

The maps also enable community planners, local officials, engineers, builders and others to determine where and how new structures and developments should be built, resulting in more resilient building practices. With the introduction of new flood maps, it is especially important for property owners, insurance agents, lenders, builders and real estate agents and brokers to understand what the changes are and what the effects will be.

Project History
Date Activity
December 2010 Project Kick-off
August 2011 Calls with communities regarding data availability and areas of concern
September 22, 2011 Discovery Meetings - UNH Alumni Center, Durham, NH
August 1, 2013 Community Work Map Meetings - UNH Alumni Center, Durham, NH
April 9, 2014 Preliminary Flood Insurance Rate Maps and Flood Insurance Study Released
May 8, 2014 Community Coordination Meetings Held in Dover and Hampton
September 2, 2014 90-Day Appeal Period Begins
December 1, 2014 90-Day Appeal Period Ends
Project Partners
Role Partner
Project Management University of New Hampshire (UNH) – Earth Systems Research Center, Durham, NH
Riverine Analysis – Hydrologic and Hydraulic Modeling U.S. Geological Survey – NH/VT Water Resources Center (Pembroke, NH)
Coastal Analysis AECOM (Boston, MA)
Database Compilation, DFIRM/FIS Production UNH
Outreach NH Office of Energy & Planning
Non-Regulatory Products UNH and AECOM

NH Office of Strategic Initiatives
Governor Hugh J. Gallen State Office Park
Johnson Hall, 3rd Floor  |  107 Pleasant Street  |  Concord, NH 03301
(603) 271-2155  |  fax: (603) 271-2615