Chemung HUC-8 Watershed Project. February 1, 2011

Transcription

1 Chemung HUC-8 Watershed Project Kickoff Bi Fl t NY Big Flats, NY February 1, 2011

2 Introductions FEMA Region II Alan Springett, Senior Engineer, FEMA Risk Analysis Risk Assessment Lead Robert Schaefer, Engineer, FEMA Risk Analysis Branch Jason Fenn, Program Specialist, FEMA Floodplain Management and Flood Insurance Andrew Martin, Regional Support Center Coordinator Crystal Smith, Regional Support Center Outreach Lead Milver Valenzuela, Project Manager, RAMPP 2

3 Objectives Why are we here? To introduce the Chemung Watershed Project Flood Map History in the Watershed (1970 s 2002) MapMod (Chemung County) Risk MAP To provide an approximate timeline for project milestones To invite communities to engage in the Discovery Process To promote communications between local stakeholders and FEMA 3

4 Future Meetings Discovery Meeting Meeting with STCRP to discuss technical comments to Chemung County work maps Levee Accreditation 4

5 Pre-Digital Chemung Watershed Mapping Efforts & Chemung County MapMod Update Prior to MapMOD, FEMA conducted Flood Studies on a community by community basis Schuyler, Steuben, and Chemung communities received map updates from the late 1970 s through 2002 Scope of Chemung County MapMOD County-wide 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 5

6 The Paradigm Shift: Map Mod to Risk MAP 6

7 Hazard Mitigation Planning Risk Map and Mitigation Planning Refer to the Plan & Keep it Current Adopt the plan and implement the mitigation strategy Coordinated and participative Planning Process Mitigation Planning Cycle Identify hazards that can affect the jurisdiction Assess the risks from these hazards 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 Strategy Develop strategy to mitigate the risks 7

8 Risk MAP Program Overview Risk Mapping, Assessment, and Planning (Risk MAP) provides communities with flood information and tools they can use to enhance their mitigation plans and better educate & protect their citizens 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 8

9 Draft Chemung Watershed Scope of Study Proposed Study Streams within Chemung County Mileage Affected Communities Town of Ashland, Village of Bentley Creek Wellsburg Town of Ashland, Town of Elmira, City of Elmira, Town of Chemung River 12.8 Southport, Village of Wellsburg Cuthrie Run 3.5 Town of Big Flats Town of Horseheads, Village of Newtown Creek 13.4 Horseheads Town of Horseheads, Village of Prospect Creek 3.3 Horseheads Town of Ashland, Town of Seeley Creek 10.7 Southport Sing Sing Creek 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 07T 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 9

10 Draft Chemung Watershed Scope of Study 10

11 Chemung Watershed Study Elevation Data Acquisition Chemung County LIDAR collected in 2005 Remainder of watershed will be collected in

12 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 12

13 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 non- regulatory and are not subject to statutory due-process requirements 13

14 Changes Since Last FIRM Unchanged SFHA Increase SFHA Decrease Data Fields Include Example Data Values Old Study DateUnchanged e.g Old Model Type(s) e.g. HEC-1 / HEC-2 Old Zone Type e.g. Zone SFHA A Increase Old Topography eg e.g. USGS10-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 e.g. new structures, Factors / Changes gages, topo, landuse, etc. Estimated Structures e.g. 9 Unchanged Estimated Population e.g

15 Flood Depth Grids Depth Grid Calculated as Difference between WSE and Ground XS XS Depth 15

16 10% Depth (10-Year) 2ft 1% Annual Chance Floodplain Boundary 0 ft 0ft 0 ft 16

17 1% Depth (100-Year) 5ft 0 ft 1ft 0 ft 17

18 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 18

19 Discovery Discovery is an interactive process of engaging stakeholders to develop the best possible flood risk product within the budget cost constraints. Key elements: Collaboration Data collection & analysis Presenting analysis findings and proposing a draft scope of work for the watershed Working together to finalize the scope of work for the watershed Agreeing to work together, as a team, throughout the project lifecycle and beyond through a Project Charter 19

20 Discovery Why is it important to participate in the Discovery process? To get the best picture of a community s flood risk, FEMA needs your help. The data FEMA has available at the national and regional level only tells part of the story. Flood hazards change over time. A complete, current picture of your flood hazards and risks will help you better: Plan for the risk Take action to protect your communities Communicate the risk to your citizens 20

21 Discovery What kinds of data are we looking for? Historical flooding information Existing flood hazard data Mitigation activities Comprehensive plans Stormwater management activities Infrastructure information; especially for levees, new bridges, bridge removals, dams, culverts, and road improvements Building footprints or parcel data Elevation data Flood study needs Regional watershed plans 21

22 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 22

23 Milestones Fall 2010: Draft Chemung County Flood Maps delivered Winter Spring 2011: Chemung Watershed Discovery Summer 2011: Engineering work begins with finalized scope of work Spring 2013: Preliminary Risk MAP products tentatively scheduled for delivery 23

24 Evaluation Forms Please take a couple minutes to fill out the evaluation sheet that was handed to you when you walked in. We appreciate your feedback to make future meetings more effective. 24

25 Contact Information FEMA Region II Paul Weberg, Senior Engineer, FEMA Risk Analysis Mapping Lead (212) Alan Springett, Senior Engineer, FEMA Risk Analysis Risk Assessment Lead (212) Robert Schaefer, Engineer, FEMA Risk Analysis Branch (212) Jason Fenn, Program Specialist, FEMA Floodplain Management and Flood Insurance (212) RAMPP Project Team Andrew Martin, Regional Support Center Coordinator (646) Crystal Smith, Regional Support Center Outreach Lead (646) Milver Valenzuela, Project Manager, RAMPP (703)

26 Resources FEMA: Floodsmart, the official site of the National Flood Insurance Program (NFIP): Risk Assessment, Mapping and Planning Partners: NFIP Reform: National Committee on Levee Safety: New York State Department of Environmental Conservation Karis Manning, NYSDEC Region 8 New York State Office of Emergency Management 26