Post on 26-Dec-2015
FLOOD STUDYChemung County, NYFEMA REGION IINovember 18, 2010
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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
Chemung Affected Panels
Planned - Pending Finalization
LegendProposed Study
County Boundary
Watershed Boundary
RedelineationNew Detailed StudyNew Approximate Study
Proposed Study Streams within
Chemung County Mileage Affected Communities
Bentley Creek 1.5Town of Ashland, Village of Wellsburg
Chemung River 12.8
Town of Ashland, Town of Elmira, City of Elmira, Town of Southport, Village of Wellsburg
Cuthrie Run 3.5 Town of Big Flats
Newtown Creek 13.4Town of Horseheads, Village of Horseheads
Prospect Creek 3.3Town of Horseheads, Village of Horseheads
Seeley Creek 10.7Town of Ashland, Town of Southport
Sing Sing Creek 10.4 Town of Big Flats, Town of Catlin
Planned Pending Finalization (FY11 streams)
South Creek 1.8 Town of SouthportNorth Branch Newtown Creek 1.8
Town of Horseheads and Town of Veteran
Newtown Creek 0.7 Town of Horseheads
Hoffman Brook 5Town of Big Flats, City of Elmira, Town of Elmira
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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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Traditional products are regulatory and subject to statutory due-process requirements
Risk MAP products are non-regulatory and are not subject to statutory due-process requirements
Program Product ComparisonsTraditional Regulatory ProductsTraditional Regulatory Products Non-Regulatory ProductsNon-Regulatory Products
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Data Fields Include Example Data Values
Old Study Date e.g. 1985
Old Model Type(s) e.g. HEC-1 / HEC-2
Old Zone Type e.g. Zone 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
Estimated Population e.g. 27
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Flood Depth Grids Depth Grid Calculated as Difference between WSE and Ground
XSXS
XSXS
DepthDepth
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HAZUSMulti-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 Coordinated
and participativ
e Planning Process
Identify hazards that can affect the
jurisdiction
Assess the risks from
these hazards
Develop strategy
to mitigate the risks
Adopt the plan and
implement the
mitigation strategy
Refer to the Plan &
Keep it Current
Risk Map and Mitigation Planning • Local hazard mitigation plans must be
updated every five (5) years.
• Use new Risk Map information to update local HMP.
• Flood Hazard Profile
• Risk Assessment
• Mitigation StrategyMitigation Planning
Cycle
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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