from tides to storms: preparing for new · +6.3 feet sea level +4.0 feet sea level +1.7 feet sea...
TRANSCRIPT
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Assessing the Risk and Vulnerability of NH Coastal Communities to Sea Level Rise and Storm Surge
FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
Seabrook - Hampton Falls – Hampton - North Hampton – Rye - New Castle - Portsmouth
This project is funded by New Hampshire Homeland
Security and Emergency Management (HSEM)
through a Pre-Disaster Mitigation Grant from the
Federal Emergency Management Agency (FEMA).
Julie LaBranche Senior Planner
NH Office of Energy and Planning Spring 2016 Planning and Zoning Conference
June 4, 2016
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
Portsmouth
New Castle
Rye
North Hampton
Hampton
Hampton Falls
Seabrook
Project Deliverables
• Maps and Data
• Regional and Municipal Vulnerability Assessment reports
Project Overview
• Evaluate impacts from sea-level rise and storm surge flooding
• Roadways, Critical Infrastructure, Natural Resources
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
Best-available science
Maps and Data
Municipal Coordination
Implementation Guidance
Vehicles for Informed Planning
Applicability
Tools and Applications
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
+6.3 feet sea level
+4.0 feet sea level
+1.7 feet sea level
Source: Wake CP, Kirshen P, Huber M, Knuuti K, and Stampone M (2014) Sea-level Rise, Storm Surges, and Extreme Precipitation in Coastal New Hampshire: Analysis of Past and Projected Future Trends.
Best Available Science- SLR Scenarios/Projections
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
Sea-level rise Sea-level rise + Storm surge
High-Resolution Mapping Flood Extents Impacts to assets and resources
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
High-Resolution Mapping Flood Extents Impacts to assets and resources
Example: Rye Harbor
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
0
10
20
30
40
50
60
MHHW+ 1.7feet SLR
MHHW+ 4.0feet SLR
MHHW+ 6.3feet SLR
storm surge +1.7 feet SLR
storm surge +4.0 feet SLR
storm surge +6.3 feet SLR
State and Local Roadways (miles)
Local State
Impacts by Asset type
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
0
5
10
15
20
25
Hampton HamptonFalls
NewCastle
NorthHampton Portsmouth
Rye Seabrook
Miles of Roadway by Municipality
SLR + 1.7 feet SLR + 4.0 feet SLR +6.3 feet
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
0
200
400
600
800
1,000
1,200
1,400
Upland - acres above mean higher high water
SLR + 1.7 feet SLR + 4.0 feet SLR +6.3 feet
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
0
200
400
600
800
1,000
1,200
1,400
1,600
Municipal Zoning Districts (acres)
SLR + 1.7 feet SLR + 4.0 feet SLR +6.3 feet
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
Implementation Guidance
• Designing for resiliency in the current 100-year floodplain will protect against long term sea-level rise
• Adaptation strategies need to be customized to address variable conditions
• Iterative actions, not a one-size-fits-all problem
• No-regrets policies and investments
• Periodic review and evaluation of climate science findings, adjust strategies accordingly
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
Municipal Coordination
Administration
Public Works
Planning
Building/Code Enforcement
Conservation
Public Outreach & Participation
Community Support For Actions
Regional & State Coordination
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• Critical Infrastructure
• State and Local Roads
• Utilities and Infrastructure
• Natural Resources - Environment
• Policy and Planning Recommendations
• Regulatory Strategies
• Non-Regulatory Approaches
Local Hazard Mitigation
Plans
State Agency Plans
Regional
Master Plan
Natural Resource Conservation
Vulnerability Assessment
Regional Planning Recommendations
FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
Vehicles for Informed Planning
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
How can the project results be useful?
o Inform recommendations in the CRHC Final Report
o Assist regional practitioners with technical assistance and outreach to municipalities
o Guide policy changes by state agencies
o Provide a solid rationale for grant proposals to fund infrastructure improvements, planning and community outreach
Project Applicability
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FROM TIDES TO STORMS: PREPARING FOR NEW HAMPSHIRE’S FUTURE COAST
• Regional Assessment and Maps
• Municipal Assessment and Maps http://www.rpc-nh.org/regional-community-planning/climate-change/resources
For information contact: Julie LaBranche Senior Planner Rockingham Planning Commission 156 Water Street, Exeter, NH 03833 Phone: (603) 778-0885 Email: [email protected]
Project Materials