Updating Georgia’s Coastal MapsUpdating Georgia’s Coastal Maps Collaboration on my Mind June 2,...
Transcript of Updating Georgia’s Coastal MapsUpdating Georgia’s Coastal Maps Collaboration on my Mind June 2,...
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Updating Georgia’s Coastal Maps Collaboration on my Mind
June 2, 2015
Onur Celik, PE, CFM,
CDM Smith
Todd Harris, PMP, CFM
Georgia Department of Natural Resources
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Outline
• Project Overview
– History
– Scope
– Collaborating Parties
– Outreach
• Analyses and Mapping Approach
– Coastal Analysis
– Riverine Analysis
– Mapping/Regulatory Products
– Non-Regulatory Products
• Conclusion – Q/A
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History – Georgia Flood M.A.P. Program
• Increase focus on risk assessment and planning
• Continue partnerships with Federal, State, and Local Agencies
• Acquire and utilize high accuracy topo data
• Deliver risk products and datasets
Enhanced Outreach Program
• Outreach Guidebooks
• Increased Community Engagement
• Robust Website (www.georgiadfirm.com)
Transitioning State Program to align with FEMA’s Risk MAP Program
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History
• Effective Coastal Studies are dated– Current surge analysis is 20 to 40+ years old!
Chatham County – ESSA’S JPM Method (1970)
Climate data from 1965 to 1981
Glynn and Camden Counties – SURGE model update in 1989
• Riverine Studies are partially up-to dateBryan, Charlton, Effingham, Liberty, Long, Chatham partially updated in 2014
Camden, Glynn, McIntosh analyses were older and did not utilize the current LiDAR data or latest hydraulic models
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History
– FEMA Funded Risk MAP projects for
10 Counties in Eastern/Coastal Georgia:
• Bryan
• Camden
• Charlton
• Chatham
• Effingham
• Glynn
• Liberty
• Long
• McIntosh
• Newton
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Scope
Complete (Inland):
– Completed:
In Progress (Coastal):
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Collaborating Parties
– FEMA contracted AECOM/Baker for Coastal Analyses
– Georgia DNR contracted CDM Smith and Dewberry for Riverine Analyses, Production
– Inland Riverine Analyses completed and
inland counties became effective in 2014
– Coastal Analyses are complete in Spring
- Preliminary Maps will be issued tentatively
in September
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Outreach
DiscoveryMulti-Agency Coordination
Meeting
Kick-off (Coastal Update) Meeting
H&H-Coastal Modeling
Flood Risk Review
Meetings
Preliminary
FIRMs & FIS
MARCH 2012 FEB. 2013 FALL 2014 AUG. 2015 SEP. 2015MAY 2014
FALL 2015
PRELIMINARY PROCESSING
POST PRELIMINARY PROCESSING
FEMA issues Letter of Final Determination
Six Month Compliance
Period (Ordinance Updates)
Resilience Meeting
CCO Meeting90-Day Appeal
Period
FEMA & GA DNR resolve appeals &
protests
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Outreach – Upcoming Flood Study Review Meetings
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Outreach – Property Notification Tool
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Analyses and Mapping Approach
• Study Types:
– Coastal
– VE or AE Zones
– LiMWA
– Riverine
– Detailed/Limited Detailed
– Redelineation
– Approximate
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Coastal Analyses
Determined from storm surge model
Components of Coastal Flooding:
1. Storm Surge Stillwater Elevation (SWEL)
2. Wave Setup
3. Wave Height
4. Wave Runup
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Coastal Analyses – Storm Surge
• Set up “mesh” for hurricane/surge model
• Validated hurricane/surge model
• Ran hundreds of hypothetical storms
• Resulting storm surge still water elevations for the 1% annual chance event
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Coastal Analyses
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Coastal Analyses – Mapping
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Riverine Analyses
37131.0500
35257.9400
35037.9400
– Types of Analyses
– Detailed/Limited Detailed
– Redelineation
– Approximate
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Riverine Analyses
1200 1400 1600 1800 2000 2200 2400 2600
76
78
80
82
84
Beaverdam Swamp- Approximate Study RS = 54448.14
Station (ft)
Ele
vatio
n (
ft)
Legend
WS 100yr
Ground
Ineff
Bank Sta
.12 .06
.12
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Regulatory Products
• Upcoming FIRM and FIS Report will follow new Specifications:
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Regulatory Products – FIS Report
• Database Driven and more User Friendly
Old Format New Format
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Regulatory Products – FIS Report
• Map Index in the report for easy reference
• Information for 4% (25 Year) Flood (where available):
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Regulatory Products – FIS Report
• Future Conditions
(if applicable)
• Protection Measures:
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Regulatory Products – FIRM
• Additional Information (Elevations at 1/10’ increments etc)
• New Look, more streamlined legend
Old Format New Format
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Regulatory Products – FIRM
• User Friendly
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Regulatory Products – FIRM
• Additional Information (Elevations at 1/10’ increments etc)
• New Look, more streamlined legend
Old Format New Format
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Non-Regulatory Product – Changes Since Last FIRM
• First Time in Georgia
• Provides information to be used for Mitigation/Outreach Activities
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Non-Regulatory Product – Flood Depth Grid
• First Time in Georgia
• Provides information to be used for Mitigation/Outreach Activities
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Non-Regulatory Product – Wave Height Grid
• First Time in Georgia
• Provides information to be used for Mitigation/Outreach Activities
Example: Wave Height Grid
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Non-Regulatory Product – Risk Assessment Grid
• First Time in Georgia
• Provides information to be used for Mitigation/Outreach Activities
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Non-Regulatory Product – AOMI
• First Time in Georgia
• Provides information to be used for Mitigation/Outreach Activities
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Conclusion
Preliminary by
September 30
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Questions/Comments???
Todd Harris, GADNR, [email protected]
Onur Celik, CDM Smith, [email protected]