Discovery Partnership Meeting - Arkansas ANRC State... · “inventory” • Organizes, stores,...
Transcript of Discovery Partnership Meeting - Arkansas ANRC State... · “inventory” • Organizes, stores,...
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2nd Annual Arkansas State Discovery Partnership Meeting
April 17, 2013Jacksonville, ARJacksonville, AR
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YOUR HOSTS TODAY
Mike Borengasser, ANRCLinda Johnson & MaryBeth Breed,
FTN AssociatesFTN AssociatesStephen Noe & Alicia Williams,
AMEC E i & I fAMEC Environment & InfrastructureMatthew DuBois, FEMA Region 6
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A k N t l R C i iArkansas Natural Resources Commission becomes a Cooperating Technical Partner
ith FEMA i S t b 2011with FEMA in September 2011
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ANRC’s CTP Program DRAFT Vision Statement
It is the intent of the State of Arkansas, through the CTP Program, to work with FEMA through the Risk MAP
Program to identify manage and mitigate the naturalProgram to identify, manage, and mitigate the natural hazard risks in our state through sound science and
engineering practices and effective communication so that all of our citizens are aware of the potential risks in
their communities.
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FEMA’s Risk MAP Program
Risk MAPMatthew DuBois FEMA Region 6
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Watershed Based ApproachHydrologic Unit Code (HUC) 8y g ( )
FEMA Implements Watershed-Based Studies to develop a complete, consistent, and connected flood
engineer analysis within a watershed ~PM59 (FY2010)
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Arkansas Watersheds
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Overview of new flood risk product datasets
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FEMA Vision for Risk MAP
• FEMA Risk Mapping, Assessment, and Planning (MAP) Program
– Implement watershed-based studies that create a more accurate, holistic picture of risk
– Ensure 80% of the Nation’s flood hazards are current
– Maximize the number of communities that use Risk MAP data and products to develop, implement and/or update their p, p phazard mitigation plans
– Deliver quality flood data that increases public awareness and leads to action that reduces risk to life and propertythat reduces risk to life and property
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Changes Since Last FIRM Data– Polygon areas of change for 1% and 0.2%
annual chance floodplains and floodways. Polygons attributed for regulatory zone h d t ib ti i ichanges and contributing engineering
factors (e.g. changes to peak discharges, modeling methodology).
Possible enhancements (data must be– Possible enhancements (data must be locally supplied):
• Structures: the total estimated count of affected buildings within the area of changeg
• Population: the total estimated affected population within the area of change
– FRR shows summaries of the increases, decreases, and net change of SFHAs and buildings and population affected
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Previous Mapped Floodplain
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Newly Mapped Floodplain
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Changes Since Last FIRM
UnchangedUnchanged
SFHA Increase
SFHA DecreaseUnchanged
13
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Flood Depth GridsRaster (grid) of water depthDepth is calculated as the difference (in feet) between the water
surface elevation and the groundsurface elevation and the groundProduced for 10%, 4%, 2%, 1%, and 0.2% annual chance events
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Flood Depth Grids
AerialAerialImagerImagerImageryImagery
Point APoint A
Point C
Point BPoint B
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Flood Depth Grids, 100 year
1%1%1% Depth1% Depth
5.4 ft5.4 ft
0.0 ft
2.3 ft2.3 ft
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Flood Depth Grids, 25 Year
4% Depth4% Depth
3.5 ft3.5 ft3.5 ft3.5 ft
0.0 ft
0.4 ft0.4 ft
17
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Percent Annual Chance of Flooding
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Percent 30 Year Grids
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Percent Chance of Flooding Over 30-Yrs
% Chance% ChanceOver 30Over 30--yrsyrs
96% +96% +96% 96%
7%
78%78%
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Velocity GridVelocity Gridyy
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Flood Risk Assessment
– Flood Risk Assessment Products (where 10% 4% 2% 1% 0 2%(where 10%, 4%, 2%, 1%, 0.2%, input for Average Annual Loss)
• Area (Risk, Very Low to Very High)High)
• Factors– Classification (Residential,
C i l Oth )Commercial, Other)– Average Value
(buildings/census block)– Population– Total Loss– Building Lossg– Content Loss
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Areas of Mitigation Interest• Examples: channel improvements, home buy-outs, urbanization, non-regulated
flood structures, undersized culverts, pinch points, etc.
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Flood Risk Map
• Watershed level base data
• 2010 Level One HAZUS Provided by FEMA available statewide
• Areas of New Studies will have updated HAZUS results
• Areas of mitigation interest – Hazard Mitigation Plan Data and Community g yInput
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Flood Risk Report
• Provides a summary of all flood risk information in a single source.
• Developed exclusively from data that resides within the Flood Risk Database (FRD).
G hi d t bl ill b di tl• Graphics and tables will be directly derived from the FRD.
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“It’s Really Simple”Topography Hydrology HydraulicsTopography, Hydrology, Hydraulics,
and Mapping!
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Risk MAP Experts
Often Left Scratching their Heads
GISManager
Dr. HydraulicsHydrologistHydrologist
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Topography Data Developmentp g p y p
• Local DataLocal Data• USACE Data
LiDAR• LiDAR(Statewide - goal)
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Field Survey
• Hydrographic• Bathometric• Conveyance Structures
DCS C li• DCS Compliant• NAVD88
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Point Cloud Surveysy
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Hydrology – Typically up to 1 sq mile DA
• Detailed calibration processp
• Storage/Peak sensitivesensitive Checks
• Steady vs• Steady vs Unsteady flow modelingflow modeling
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10% Drainage Point NetworkMulti-Frequency (10, 25, 50, 100 and 500 Year Events)
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Hydraulics – HEC-RAS
• Potential Unsteady Flow Analysis
• Usually the Streams are Backwaterare Backwater sensitive
• Water surface elevations calibrated to gage locations if at all possibleall possible.
• Detailed Geometry descriptions
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Depth GridspUpdated Local Plans (5) Rolled up to State Plan (3)
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Partnering
THANK YOU FOR JOINING US TODAY
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Benefits of Partnering
Prioritization / CNMSData Sharing
Leverage gCollaboration
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Coordinated Needs Management Strategy (CNMS)gy ( )
“CNMS defines an approach and structureCNMS defines an approach and structure for the identification and management of
flood hazard mapping needs that will provide support to data-driven planning and the
flood map update investment process in a geospatial environment “geospatial environment.
-CNMS Database User’s Guide V 4.2
-DRAFT CNMS Database User’s Guide V 5.3 currently under review
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What is CNMS?
• FEMA’s geospatial Special Flood Hazard mappingFEMAs geospatial Special Flood Hazard mapping “inventory”
• Organizes, stores, and analyzes flood hazard mapping needs information for communities
• Influences map update decisions (priorities)Standardizes how we collect map update data before• Standardizes how we collect map update data before, during, and after map production
• “Living” Databaseg– AR CTP will facilitate database updates
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What is CNMS?
• VALID: Model backed zero critical and fewer than fourStream Assigned a VALIDATION STATUS
VALID: Model backed, zero critical and fewer than four secondary elements identified.
• UNVERIFIED: Model backed with least one critical, or four or more secondary elements identified; or not model backed
• UNKNOWN: An evaluation is planned or in queue or• UNKNOWN: An evaluation is planned or in queue, or no definitive determination of the validity
• ASSESSED: If a flooding source in an unmapped area is considered for a new study,
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What is CNMS?
• Critical Elements:– Major change in hydrology data (major flood event, updated
peak discharges, outdated methodology)– Addition / removal of major flood structure (dam)– Channel reconfiguration / major fill or scour– Five or more new / removed hydraulic structures
• Secondary Elements (not all inclusive list):• Secondary Elements (not all inclusive list):– Repetitive losses– 1 to 4 new / removed hydraulic structures– Isolated channel improvements– Better topography– Change in land-use (>50%), vegetation, land-useg ( ) g
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What is CNMS?
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Where are we with CNMS?
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Data Sharing
DFIRM Data (49 / 75 modernized or in (
progress)
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Arkansas DFIRM Status
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Data Sharing
Hazard Mitigation Plans(45 have a plan, ( p ,7 plans expired,
2 plans pending adoption2 plans pending adoption, 21 have no plan)
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Arkansas Hazard Mitigation Plan Status
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Data Sharing / LiDAR
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Arkansas 303d Listed Waters
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LEVERAGE
COST SHARINGIN-KIND SERVICESIN KIND SERVICES
DATA PROCUREMENTPROCUREMENT
OPTIONS
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LEVERAGE
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NEXT STEPS
• 2014 - 3rd ANNUAL ARKANSAS STATE PARTNERSHIP MEETING– Mid April 2013 (precedes AFMA Spring Conf.)p (p p g )
• OUR PROJECTS• YOUR PROJECTS?• YOUR PROJECTS?
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OUR PROJECTS / CURRENT
• LOWER AR – MAUMELLE (AR / FEMA)LOWER AR MAUMELLE (AR / FEMA)– Discovery Closeout / On-hold due to Levees
• BAYOU BOEUF (LA)• BAYOU BOEUF (LA)– Discovery Closeout / Project Selection
UPPER SALINE• UPPER SALINE – Discovery Meetings (04/23-24/2013)
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OUR PROJECTS / CURRENT
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OUR PROJECTS / PROPOSED
• FY2013 PRIORITY WATERSHEDS– Lower Black– Bayou Metoy– Lake Conway – Point Remove– CacheCache– Lower St. Francis– L’AnguilleL Anguille– Dardanelle Reservoir
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OUR PROJECTS / PROPOSED
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OUR PROJECTS / PROPOSED
• Lower Black• Lower Black• Bayou Meto• Lake Conway – Point Remove• Cache• Lower St. Francis• L’Anguille• L Anguille
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OUR PROJECTS / PROPOSED
#1 Lower Black– AR Silver Jackets collaborative project– City of Pochahontas / Randolph County levee y p y
work– Flood losses– Other partnering opportunities
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OUR PROJECTS / PROPOSED
#2 Bayou Metoy– Elevation data availability– Recent flood losses / infrastructure impacts p
(Sherwood, Jacksonville, Cabot, Pulaski County)
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OUR PROJECTS / PROPOSED
#3 Lake Conway – Point Removey– Elevation data availability– Partnering opportunitiesg pp– Proximity to Bayou Meto Watershed (cost-
savings through efficiencies in meetings)g g g )
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OUR PROJECTS / PROPOSED
#4 Cache– AR Silver Jackets collaborative project– Flood losses / infrastructure impacts– Elevation data availability– Other partnering opportunities– Proximity to Lower Black Watershed (cost-
savings through efficiencies in meetings)
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OUR PROJECTS / PROPOSED
#5 Lower St. Francis– Flood losses– Elevation data availabilityy– Partnering opportunities– Proximity to Cache Watershed (cost-savingsProximity to Cache Watershed (cost savings
through efficiencies in meetings)
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OUR PROJECTS / PROPOSED
#6 L’Anguilleg– Flood losses– Elevation data availabilityy– Partnering opportunities– Proximity to Lower Black and CacheProximity to Lower Black and Cache
Watersheds (cost-savings through efficiencies in meetings)
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Your Projects?
• Flood Mitigation• Data Collection Efforts (LiDAR, Topography,
Aerial Photography, GIS based data)• Engineering Studies / Drainage Reports• Transportation ImprovementsTransportation Improvements
Bridge Replacement Regional Detention
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Coordinated Needs Management Strategy
Your flooding sources “Hot Line”Your flooding sources “Hot Line”
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PARTNERING DISCUSSIONS