Carbon Solutions New England

Maps & Resources

What is a 100 year flood?

Fact Sheets

Maps

Reports, Publications & Theses

Presentations

Graphs

Links to Other Resources

Flooding 101

 

Fact Sheets

Changing Flood Risk in the Lamprey River Watershed

Epping

Lee, Durham, and Newmarket

Raymond

Maps

1. Lamprey River Watershed

2. Our project has modeled and mapped existing and potential future 100-year floodplains in Lamprey River Watershed. Information in the maps can be used for municipal and regional planning, emergency management, zoning, master plan updates, and infrastructure projects.

A series of floodplain maps depicts the extent of 100 year floods for the following conditions:

1 percent change annual flood maps for several climate and land cover scenarios are available from NH Granit.

    Watershed Map - FIRM, 2005 Conditions, 2100 Conventional Buildout
    Watershed Map - FIRM, 2005 Conditions, 2100 Conventional Buildout with Aerial Photo Base
    Watershed Map - FIRM, 2005 Conditions, 2100 LID Buildout

    Durham - FIRM, 2005 Conditions, 2100 Conventional Buildout
    Durham - FIRM, 2005 Conditions, 2100 LID Buildout

    Epping - FIRM, 2005 Conditions, 2100 Conventional Buildout
    Epping - FIRM, 2005 Conditions, 2100 LID Buildout

    Lee - FIRM, 2005 Conditions, 2100 Conventional Buildout
    Lee - FIRM, 2005 Conditions, 2100 LID Buildout

    Newmarket - FIRM, 2005 Conditions, 2100 Conventional Buildout
    Newmarket - FIRM, 2005 Conditions, 2100 LID Buildout

    Raymond - FIRM, 2005 Conditions, 2100 Conventional Buildout
    Raymond - FIRM, 2005 Conditions, 2100 LID Buildout

Economic damage for different sized floods for several climate and land cover scenarios are also available from NH Granit.

3. Trends in Land Use

Future Land Use Scenarios

Click here to see a movie of the four maps above. The movie shows increasing development in the watershed over almost 50 years. Watch the red areas of land, which represent development, increase with time.

 

Reports, Publications & Theses

Presentations

 

Graphs

The following series of graphs shows land use and population change over the period of 1962-2005 (the same time period as the land use maps above) for the towns that comprise the Lamprey River Watershed.

Graph 1. Land use change over time, by town in the Lamprey River Watershed. (Cameron Wake)

Graph 2. Population change over time, by town in the Lamprey River Watershed. (Cameron Wake)

Graph 3. Land use and population change over time, by town in the Lamprey River Watershed. (Cameron Wake)

Links to Other Resources

Current water flows on the Lamprey River

Lamprey River Watershed Association

Lamprey River Advisory Committee

NH's Office of Strategic Initatives — Floodplain Management Program

FEMA Flood Insurance Rate maps (FIRMs)

USGS Factsheet on the effects of urban development on flooding

Explore what other NH communities are doing to reduce flood risk

Association of State Floodplain Managers — Allow "No Adverse Impact" principles to guide regulations

Maine Flood Resilience Checklist: A self-assessment tool for Maine's coastal communities to evaluate vulnerability to flood hazards and increase resilience.

National Council for Home Safety and Security — Disaster Preparedness Guide

New Hampshire Coastal Risk and Hazard Commission Report and Recommendations

Climate Change in Southern New Hampshire: Past, Present and, Future (2014) UNH Sustainability Institute Report

2017 National Climate Assessment (NCA4) — Climate Science Special Report