A Flood Insurance Study (FIS) is developed in conjunction with the Flood Insurance Rate Map (FIRM). The FIS contains a narrative of the flood history of a community and discusses the engineering methods used to develop the FIRMs. The study also contains flood profiles for studied flooding sources and can be used to determine Base Flood Elevations for some areas.

All FISs can be viewed on FEMA's Map Service Center. PDF versions of the FISs for communities in Cheshire, Grafton, Hillsborough, Merrimack, Rockingham, Strafford, and Sullivan counties can be viewed and downloaded from UNH's GRANIT website.

NH Flood Studies and Data

Investigation of April 2007 Flood in Southern and Southeastern New Hampshire

• Scope of Work and Public Meeting Information

Suncook River Avulsion Study

• Suncook River Geomorphology-based Restoration Alternatives Study Documents

April 2007 Flood Data

• USGS News Release
• USGS Data Table
• USGS Map showing recurrence intervals
• USGS Graphs

May 2006 Flood Report

• Flood of May 2006 in New Hampshire (USGS Report 2007-1122)

October 2005 Flood Report and Data

• Flood Study of Warren Brook in Alstead and Cold River in Alstead, Langdon, and Walpole, NH, 2005 (USGS Report 2006-1313)
• Flood of October 8 and 9, 2005, on Cold River in Walpole, Langdon, and Alstead and on Warren Brook in Alstead, New Hampshire (USGS Report 2006-1221)
• USGS Data Table
  

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