Transcript Flood Risk Products & Datasets Training

FLOOD STUDY
Chemung County, NY
FEMA REGION II
November 18, 2010
Agenda
 Introductions
 Objectives
 Map Modernization (MapMod) Program Overview
 Chemung County MapMod Update
 Risk Mapping, Assessment, and Planning (Risk MAP)
Program Overview
 Chemung Watershed Study Introduction
 Milestones
 Community Engagement
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Introductions
 FEMA Region II
• Scott Duell, Risk Analysis Branch Chief
• Mary Colvin, Floodplain Management and Flood Insurance Branch Chief
• Alan Springett, Senior Engineer, Risk Analysis Risk Assessment Lead
• Adie Koby, Program Specialist
• Bo Juza, Regional Program Management Lead
• Andrew Martin, Regional Support Center Coordinator
• Tolga Yilmaz, Regional Support Center Deputy Coordinator
• John Dromsky-Reed, Mapping Partner, MapMod
• Milver Valenzuela, Mapping Partner, Risk MAP
 U.S. Army Corps of Engineers – Baltimore District
• Dan Risley, Hydraulic Engineer, Engineering Division
• George Bielen, Operations Manager, Susquehanna River Project, Operations Division
• Leon Skinner, Construction Service Representative, Operations Division
 New York State Department of Environmental Conservation (NYSDEC)
• William Nechamen, New York State Floodplain Coordinator
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Objectives
 Objectives
• To provide an overview of Chemung County’s mapping
project status and deliver draft maps
• To transition from MapMod to Risk MAP (Mapping,
Assessment, Planning)
• To promote community engagement and enhance
capability to effectively manage flood risk
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MapMod Program Overview
 Prior to 2003, more than 70 percent of the nation’s
flood maps were at least 10 years old. In Chemung
County, with few exceptions, the communities' flood
maps dated back to the 1980s
 Congress appropriated funds in 2003 and directed
FEMA to develop and implement the MapMod
program, which:
• Created county-wide digital maps
• Utilized more current data to update maps
• Developed a new platform to convert from paper to
digital format
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Chemung County MapMod Update
 Original scope of Chemung County study
• County-wide DFIRM (78 panels), including 17 incorporated communities
• Development of county-wide digital topography from LiDAR (2003 and
2005 collections)
• Re-delineation/re-use of 110 stream miles of effective profiles
• New approximate analysis for 153 stream miles
• Field survey of Elmira Levee System and levee freeboard analysis
• Preliminary DFIRM delivery scheduled for November 30, 2010
 Adjusted scope of Chemung County study
• Production of draft “work” maps instead of preliminary maps (non-
regulatory)
 Region II delivering draft maps to Chemung County communities
providing update on current status of project
• Facilitates project transition to Risk MAP
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Risk MAP Program Overview
 Risk Mapping, Assessment, and Planning (Risk MAP) is a new
FEMA program that provides communities with flood
information and tools they can use to enhance their mitigation
plans and better protect their citizens
 The Risk MAP program aims to achieve these goals through new
strategies and products that address:
 Project prioritization – State and local input (2005 scoping
meetings; 2008 letter Southern Tier Central Regional Planning &
Development Board; and 2010 community meetings)
 Elevation data acquisition
 Watershed study approach
 Engineering and mapping
 Risk assessment, mitigation planning support
 Risk communications
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Risk MAP
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Risk MAP Vision
Through collaboration with State,
Tribal, and local entities, Risk
MAP will delivery quality data that
increases public awareness and
leads to action that reduces risk to
life and property. Risk MAP will
focus on products and services
beyond the traditional Flood
Insurance Rate Map (FIRM).
FEMA will work with officials to
help use flood risk data and tools
to effectively communicate risk to
citizens and enable communities
to enhance their corresponding
mitigation plans.
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Chemung Watershed Overview
 Chemung Watershed Study
• Community involvement led to better understanding of the community needs
• Formal growth, maturity, and additional resources of the program allowed
modification of the existing project to deliver Risk MAP
 Current FIS Status
• Draft-prelim DFIRMs are available as work maps for review by community officials
• FEMA has initiated additional detailed studies of 57 stream miles in Chemung
County as a result of the levees’ status and other concerns presented by the
County
• The FIS has been placed on hold pending completion and incorporation of the data
from the additional studies
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Chemung Watershed Study
Proposed Study
Streams within
Chemung County
Bentley Creek
Chemung River
Cuthrie Run
Newtown Creek
Prospect Creek
Seeley Creek
Sing Sing Creek
Mileage
Affected Communities
Town of Ashland, Village of
1.5 Wellsburg
Town of Ashland, Town of
Elmira, City of Elmira, Town of
12.8 Southport, Village of Wellsburg
3.5 Town of Big Flats
Town of Horseheads, Village of
13.4 Horseheads
Town of Horseheads, Village of
3.3 Horseheads
Town of Ashland, Town of
10.7 Southport
10.4 Town of Big Flats, Town of Catlin
Planned Pending Finalization (FY11 streams)
South Creek
1.8 Town of Southport
North Branch
Town of Horseheads and Town
Newtown Creek
1.8 of Veteran
Newtown Creek
0.7 Town of Horseheads
Town of Big Flats, City of Elmira,
Hoffman Brook
5 Town of Elmira
Legend
Proposed Study
New Approximate Study
New Detailed Study
Redelineation
Planned - Pending Finalization
Chemung Affected Panels
County Boundary
Watershed Boundary
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Chemung Watershed Study
Elevation Data Acquisition
Chemung County LIDAR
collected in 2005
Remainder of watershed
will be collected in 2011
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Discovery
 Discovery is the process of data mining, collection, and analysis with
the goal of initiating a flood risk or mitigation project or risk
discussions within a watershed, which includes:
• Data Collection
 Historical flooding information
 Existing flood hazard data
 Mitigation activities
 Hazard risk assessments, for example, vulnerable assets
 Mitigation strategies
• Collaboration
 Communities
 Regional planning entities
 Non-governmental organizations
 State agencies
 Other Federal agencies
 Chemung Watershed’s Discovery process will be initiated in early 2011
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Flood Risk Assessment
 Risk MAP will provide state and community officials with three Flood
Risk Products:
• Flood Risk Report
• Flood Risk Database
• Flood Risk Map
 These are designed to help communities:
• Gain a better understanding of flood risk and its potential impact on communities
and individuals
• Take mitigation actions to reduce risk
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Program Product Comparisons
Traditional Regulatory Products
Non-Regulatory Products
DFIRM Database
Traditional products are
regulatory and subject to statutory
due-process requirements
Risk MAP products are nonregulatory and are not subject to
statutory due-process requirements
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Changes Since
Last FIRM
Data Fields Include
Example Data Values
Old Study DateUnchanged e.g. 1985
Unchanged
SFHA Increase
SFHA Decrease
Old Model Type(s)
e.g. HEC-1 / HEC-2
Old Zone Type
Increase
e.g. Zone SFHA
A
Old Topography
e.g. USGS 10-ft
New Study Info/Methods
Dates, Models, etc.
New Study Zone
e.g. Zone AE
New Topography
e.g. LiDAR 2-ft
New Study Engineering
Factors / Changes
e.g. new structures,
gages, topo, landuse,
etc.
Estimated Structures
e.g. 9
Unchanged
Estimated Population
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e.g. 27
Flood Depth Grids
 Depth Grid Calculated as Difference between WSE and Ground
XS
XS
Depth
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10% Depth
(10-Year)
2 ft
1% Annual Chance
Floodplain Boundary
0 ft
0 ft
0 ft
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1% Depth
(100-Year)
5 ft
0 ft
1 ft
0 ft
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HAZUS
Multi-Hazard Estimation of Losses
 Dollar Losses
• Residential Loss
• Commercial Loss
• Other Asset Loss
 Percent Damage
• Evaluates Building Stock
• Structure and Content
Considerations
 Business Disruption
• Considers Total Occupancy Tables
• Considers Lost Income and Wages
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Hazard Mitigation Planning
 Risk Map and Mitigation Planning
Coordinated
and
participative
• Local hazard mitigation plans must be
updated every five (5) years.
Planning
Process
Refer to
the Plan &
• Use new Risk Map information to update
local HMP.
Identify
hazards that
can affect the
jurisdiction
Keep it
Current
• Flood Hazard Profile
• Risk Assessment
Mitigation
Planning
Cycle
Adopt the
plan and
implement
the
mitigation
strategy
• Mitigation Strategy
Assess the
risks from
these
hazards
Develop
strategy to
mitigate
the risks
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Risk Communication
 Federal/State/Local goals:
• To ensure safer communities and reduce risk to life and property
• To effectively communicate risk and increase public awareness,
leading citizens to make informed decisions regarding their risk
 Key factors contributing to successful achievement of these goals
are:
• Community engagement and exchange of flood risk information
• Effective collaboration through partnerships
• Strategic communications plan development
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Risk MAP Review
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Milestones
 Fall 2006: Chemung County-wide Flood
Insurance Study/Flood Insurance Rate Maps
funded
 Fall 2010: Draft Chemung County Flood Maps
delivered
 Summer 2012: Preliminary Risk MAP products
tentatively scheduled for delivery
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Community Engagement
 FEMA is committed to:
• Collaborating closely with communities within Chemung County to accurately
portray risk
• Engaging the community throughout the project timeline
• Using the best and most recent data and information available
 Opportunities for collaboration:
• Project Charter/Cooperating Technical Partnership
• GIS capabilities
• Public/private partnerships
• Education and outreach
 Strategic communications plan development
 Information materials development and dissemination
 Media relations
 Training
 Web site and social media links
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Resources
 FEMA: www.fema.gov
 Floodsmart, the official site of the National Flood Insurance Program
(NFIP): www.floodsmart.gov
 Risk Assessment, Mapping and Planning Partners:
www.RAMPP-team.com
 NFIP Reform: www.fema.gov/business/nfip/nfip_reform.shtm
 National Committee on Levee Safety: www.nfrmp.us/ncls
 New York State Department of Environmental Conservation NFIP
Coordinator
 New York State Office of Emergency Management
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