us army engineer research and development center coastal outreach advisory team kick-off meeting...
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US Army Engineer Research and Development Center
COASTAL OUTREACH ADVISORY TEAM
Kick-off MeetingNovember 19, 2010
FEMA Region III Coastal Mapping Project
US Army Engineer Research and Development Center
Today’s Agenda
Map Modernization to Risk MAPRegion III Coastal StudyPreliminary DFIRM schedulesOutreach Coastal Outreach Advisory Team (COAT)Questions/Discussion
US Army Engineer Research and Development Center
Map Mod to Risk MAPNationwide, 5-year, $1 billion program Updated FEMA’s Flood Insurance Rate Maps
(FIRMs): 70 percent were over 15 years oldProduced seamless digital flood data on a
countywide basisReduced map production timeReduced cost/time for future updates
US Army Engineer Research and Development Center
New digital FIRMs more accurately represent current flood risk
Countywide DFIRMS – easier to use and update
Map Mod to Risk MAP
US Army Engineer Research and Development Center
Risk Mapping, Assessment and Planning, or Risk MAP: 2010-2014
Builds on Map Mod successesWill deliver quality data that
increases public awareness and leads to action that reduces risk to life and property.
Watershed approachCoastal re-mappingStronger communication
support
Map Mod to Risk MAP
US Army Engineer Research and Development Center
Why a Region III Coastal Study ProjectCoastal flood risk information is out-of-dateNew Coastal Guidelines need to be
implemented Update base data such as topographic
dataset and aerial imagery to high resolution products and seamless Digital Elevation Model (DEM)
Use newer proven coastal hazard methodologies developed during the FEMA Mississippi Coastal Restudy
US Army Engineer Research and Development Center
Why a Region III Coastal Study ProjectTake advantage of higher performance
numerical modelingTake advantage of improvement in GIS
technologies to allow for more accurate FIRMs
US Army Engineer Research and Development Center
Where Will the Study Occur?
All of Region III coastal counties/cities (Atlantic Ocean Chesapeake Bay, Delaware Bay and their tributaries)
US Army Engineer Research and Development Center
Coastal Study ProcessTERRAIN PROCESSING
STORM SURGE ANALYSIS
STARTING WAVE CONDITION ANALYSIS
FIELD RECONNAISSANCE
FRONTAL DUNE DELINEATION
STORM-INDUCED EROSION
OVERLAND WAVE HEIGHT & RUNUP ANALYSIS
FLOODPLAIN BOUNDARY & FLOOD HAZARD ZONE MAPPING
US Army Engineer Research and Development Center
Base Flood Elevation on FIRM includes 4 components:1. Storm surge stillwater elevation (SWEL)2. Amount of wave setup3. Wave height above storm surge (stillwater)
elevation4. Wave runup above storm surge elevation
(where present)
Basic Elements of a Coastal Floodplain Study
US Army Engineer Research and Development Center
Region III Storm Surge ModelingCurrent stillwater elevations
(SWELs) on FIRMs date back 25-35 years
SWELs will be updated for 50 coastal counties covering approx. 2280 miles of shoreline
State-of-the art modeling setup by using ADCIRC soft coupled with the 2D wave model SWAN
US Army Engineer Research and Development Center
Region III Storm Surge Modeling (cont’d)
Obtain updated 10%, 2%, 1% and 0.2% annual chance stillwater elevations, wave setup and wave conditions for nearshore open-coast and back-bay shorelines
Model results validatedBeing performed by USACE;
due Spring 2011
US Army Engineer Research and Development Center
Coastal Hazard Analyses ComponentsTransect layoutField Reconnaissance
(land use, obstructions, shoreline conditions, structures)
Starting wave conditions (wave height and period) from 2D wave modeling
US Army Engineer Research and Development Center
Coastal Hazard Analyses ComponentsErosion analysisDevelopment of a
seamless Digital Elevation Model
Overland wave height computation (using WHAFIS)
Wave Runup
US Army Engineer Research and Development Center
Elements of a Coastal Floodplain
US Army Engineer Research and Development Center
Something New – LiMWALimit of Moderate Wave Action
FEMA Procedure Memorandum No. 50, 2008
At present, not a regulatory requirement
No Federal Insurance requirements tied to LiMWA
CRS benefit for communities requiring VE Zone construction standards in areas defined by LiMWA or areas subject to waves greater then 1.5 ft
US Army Engineer Research and Development Center
Region III Coastal Study Timeline
Surge Study Results•Spring 2011
Coastal Hazard Analysis Results•Summer 2011-Fall 2012
Preliminary DFIRMs• Winter 2011 – Spring 2013
Public Comment Period•Winter 2011– Spring 2013
Letter of Final Determination•Fall 2012– Winter 2013
New Effective Coastal DFIRMs•Spring 2013 – Summer 2014
US Army Engineer Research and Development Center
OUTREACH
US Army Engineer Research and Development Center
Outreach is Critical Goal: Maximize public and private sector
awareness of and engagement in the flood study process
Increase public awareness and understanding of risk and vulnerability to floods plus options for minimizing their risk;
Keep citizens, public officials and stakeholders informed;
Increase engagement of county and city elected officials;
Foster stakeholder awareness Provide communities with outreach tools
US Army Engineer Research and Development Center
Multiple SourcesOutreach must be constant and consistent to allInternal (“In-Reach”)
Elected OfficialsCity/County Managers & staff
StakeholdersLocal industry; Interest GroupsChamber, Civic organizations
MediaLocal newspaper, radio
PublicOpen House, Library Local Government TV & websiteHomeowner Association Meetings
US Army Engineer Research and Development Center
Coastal Study Outreach SupportCoastal Outreach StrategyWebsite – www.r3coastal.com Outreach factsheetsOutreach meetings
Initial outreach (scoping) meetings for each county/city
Regional technical storm surge study meetings
Flood study review meetings for some counties/cities
Final community meetings for each county/city
Open houses for some counties/citiesStakeholder Meetings – COAT
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Coastal Outreach Advisory TeamYour Role is Important
Share local data or new information
Relate study information and status to other stakeholders
Provide input on outreach methods, target groups, etc.
Identify potential contentious issues
Provide input on coastal study methodology
US Army Engineer Research and Development Center
Coastal Outreach Advisory TeamMeeting Frequency & Content
Every other month or as neededOne hour in lengthTypical Agenda
Study status and outreach update Request updates (e.g., outreach, new studies, issues)
from team members Share any new outreach material; ask for feedback Discuss any changes to methodology of coastal analysis;
ask for feedback Identify other possible members that should be invited
US Army Engineer Research and Development Center
New Coastal Study Results Mean…• More accurate picture of our coastal flood risks • Better, more comprehensive planning for economic development, mitigation & emergency response
• Better tools to manage flood risks, land-use, water resources, disaster recovery & other responsibilities more effectively
• Safer building practices based on current risk information
• More informed financial decisions by residents and business owners who understand their flood risk and apply their knowledge to financially protect their home or business
US Army Engineer Research and Development Center
Questions/Discussion
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