Risk MAP in Louisiana Louisiana Floodplain Management Association. Shona Gibson, PE Risk Analysis FEMA Region VI April 29, 2010

Transcription

1 in Louisiana Louisiana Floodplain Management Association Shona Gibson, PE Risk Analysis FEMA Region VI April 29, 2010

2 Overview Paradigm Shift Vision Program Goals and Measures Project Selection Process Cooperating Technical Partners Elevation Data Watershed Approach Levees in Mitigation Planning Louisiana Mapping Update 2

3 The Paradigm Shift: Map Mod to Map Modernization used increasinglyavailable technology to increase the quality, reliability, and availability of flood hazard maps and data It focused on creating digital maps to provide timely, accurate information to community planners further enhances the maps, involves communities during the assessment and planning stages, and guides and encourages them to communicate risk to their constituents 3

4 Risk Mapping, Assessment, & Planning Vision Through collaboration with State, Local, and Tribal entities, will deliver quality data that increases public awareness and leads to action that reduces risk to life and property. 4

5 : Program Goals and Measures Goals Measures 5

6 : Alignment The Solution strategies provide the foundation for motivating action to reduce risk Vision will deliver quality data that increases public awareness and leads to action that reduces risk to life and property Multi-Year Plan Program Measures Goal 1: Data Gaps Goal 2: Awareness & Understanding Goal 3: Mitigation Planning Goal 4: Digital Platform Goal 5: Synergize Programs Address gaps in flood hazard data Measurably increase public s awareness & understanding Lead effective engagement in Mitigation Planning Provide an enhanced digital platform Align Risk Analysis programs and develop synergies Solution Project Planning Elevation Data Acquisition Watershed Approach Engineering and Mapping Risk Assessment Mitigation Planning Support Risk Communication 6

7 : Project Selection Process Focus Areas 2010 Coastal, Levee and Other Engineering Funding will be based on Trifecta Risk Need Availability of Elevation Coverage Focus Areas 2011 Funding will be based on Superfecta Risk + Need + Elevation Coverage Partner Contribution

8 : Risk Profile (FY10) Currently based on 10 Factors Majority are population centric Repetitive Loss Number of declared disasters Elevation coverage needed to prepare studies 8

9 : Risk Profile (FY11 and beyond) Annualized Loss Estimation Nationwide HAZUS Level 1 analysis May assist in indication of unmapped areas of Risk Levees will elevate risk profile in Louisiana communities Larger population centers may still remain at the upper end of risk profile for State Partner Contribution may help community profile 9

10 : Need Profile (FY10) New, Validated, Updated Engineering (NVUE) Coordinated Needs Management System (CNMS) Specific Local Needs and Other historical data available at the Regional level 10 Provisional Accredited Levee (PAL) agreements expire Watershed approach implementation 10

11 : Need Profile Coordinated Needs Management System (CNMS) Catalog of stream centerlines Validation review results Community requests 17 factors reviewed Study Methodology Land Use Changes Development 11

12 : Need Profile (FY11 and beyond) Need to be based solely on information in CNMS Review land use, aerial imagery Review of gage records Review of currency of H&H analysis Addition/Removal of structures Repetitive loss information in the area 18 PAL agreements expire in 2011 Protected areas will need to be reviewed and analyzed. 12

13 : Strategies Quality Data - Need adequate topographic information to produce studies in Review of Annualized Loss Estimate Study Assessment of need in unmapped areas Prepare and update Mitigation Plans against updated products Risk communication to constituents consistent messages from FEMA, State and Local officials 13

14 : CTPs Cooperating Technical Partners (CTPs) Region VI would like to focus efforts to align with long term partners whom are Interested ability and willingness to take ownership of risk reduction activities in their communities Capable In-house staff capabilities to complete both management and technical aspects of the program. Partner Contribution crucial in FY2011 and beyond 14

15 : Elevation Data Acquisition Leverage available data and acquire limited new data Identify existing value-added sources of data and announce that FEMA seeks to cost share for high-quality data Permit data acquisition as separate element of work Acquire on watershed basis taking into account economies of scale

16 : Elevation Data Acquisition FEMA working to update and assure 80% of flood risk is valid. New analysis on updated elevation data Efforts to coordinate with federal, state, tribal and local partners to identify and use the increasing supply of existing high-quality geospatial data Partner contributions can be used to collect elevation data 16

17 : Watershed Approach Encourage work across community boundaries and consideration of impact on surrounding communities Increase FEMA s ability to collaborate with other federal agencies that already use watershed approach Improve usability and overall data value by setting the stage for new analyses Better depict flood hazards, known to follow streams within watersheds Enable FEMA to better identify the need for study efforts Levee studies for systems versus community and county level 17

18 : Watershed Approach Some principal factors drive need for flood hazard updates Physical changes (man-made and natural) Engineering methodology (improved analysis) Failing to keep pace with the changing and dynamic nature of watersheds ultimately leads to unwise decisions that place homeowners and communities at increased risk of flooding. 58 watersheds in the State of Louisiana 34 shared with adjacent states 18

19 : Levees During, FEMA will: Ensure the appropriate flood hazards are depicted on Digital Flood Insurance Rate Maps (DFIRMs) for counties with levees, including those impacted by expiring Provisionally Accredited Levee status. Increase the awareness of the flood risk for areas affected by levees through the completion of the Mid-Term Levee Inventory. These efforts are in coordination with the United States Army Corps of Engineers (USACE) development and population of the National Levee Database. 19

20 : Levees The determination on whether a levee-affected area needs to be analyzed and potentially remapped will be based on whether levee owners provide the necessary technical data needed to accredit the levee system. To update the flood hazard maps affected by levees, FEMA will perform updated hydraulic analysis and issue updated DFIRMs. With and without levee analysis 10 PALs expire in PALs expire in

21 : Levees Both levees in place Determines in-channel elevation 21

22 : Levees Left levee removed Determines landward elevation for left levee 22

23 : Levees Right levee removed Determines landward elevation for right levee 23

24 : Levees Three scenarios for mapping Elevations calculated used to map SFHA De-Accredited Levees Shaded Zone X Landward risk is high 24

25 : Levees Accredited Levees Shaded Zone X Landward risk is moderate 25

26 : Mitigation Planning Mitigation planning is the foundation of effective risk reduction, and therefore necessitates integration at all levels. In the Mitigation Planning program area, FEMA will seek opportunities to create synergies with flood hazard mapping and flood risk assessments, as well as other related functions and missions. 26

27 How can you help? Forward local knowledge to State Contact at FEMA Region VI Office Assist locals in providing CNMS ready information Stream Name and Location of Need Community Name and Contact Person Increase State-Local Partnering to increase viability of projects (Elevation Availability) 27

28 Project Status 28

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