Piloting LAMP from Stream to Sea

Transcription

1 Piloting LAMP from Stream to Sea FEMA s New Analysis and Mapping Procedures for Non-Accredited Levee Systems Presented by: Eric Simmons, CFM Senior Engineer, FEMA Region IX

2 Presentation Outline Levee Issues Kaunakakai Study Mapping Process Remapping Results Lessons Learned Conclusion 2

3 The Levee Issue Most levee systems accredited by FEMA are not certified in accordance with 44 CFR Regulations and mapping specifications require that the protection afforded by these levees not be recognized on a new or revised FIRM. Political, economic and media concerns resulting from large flood zone changes without adequate outreach will delay map updates, hamper risk communication and stymie hazard mitigation work. 3

4 Kaunakakai Jan. 2008, PAL agreement signed Sept. 2009, New Maui County FIRM effective March 2011, FEMA initiates effort to revisit approach to analyze and map along levees that cannot be shown as providing protection from base flood July 2013, FEMA issues guidance titled: Approach to Analyzing and Mapping Procedures for Non-Accredited levees July 2013, FEMA initiates 25 Pilot Projects 4

5 Kaunakakai Replace with high res graphic of effective FIRM 5

6 Kaunakakai South Central Coast of Molokai Flood Control Project constructed in 1950 LB levee - 3,800 and extends from north of the Town of Kaunakakai to the Pacific Ocean RB levee 1,050 and extends past the Kaunakakai Homestead Approx. population 1,200 people Approx. structures 455 6

7 Data Collection & Analysis Top of Levee (National Levee Database) O&M Plan (County of Maui) Topographic Data (FEMA and USACE) Inspection Report (USACE) Hydraulic Model (USACE) Analysis & Mapping Plan (LLPT) 7

8 Hydraulic Analysis Natural Valley Procedure HEC-RAS 4.10 Topography Mauna Loa Hwy 8

9 Re-Mapping Results Insert Riverine Only 9

10 Re-Mapping Results Insert Hurricane Only 10

11 Re-Mapping Results Insert Both Riverine and Hurricane Mapping 11

12 Re-Mapping Results Floodway & V Zone Minimal Impact Proposed SFHA Major Impact Riverine & Coastal Mapping Tie-in Using engineering judgment, not just GIS Communicating people can be flooded by multiple flooding sources 12

13 Achieving Resilient Communities Science Social Updated engineering analysis LiDAR New processes (LAMP) Outreach & partnerships Risk perception Community preparedness Personal impacts Political climate Impacts to business, homes, etc. post disaster Cost of mitigation Impacts due to new legislation Federal policy Economic 13

14 Science New topographic data (LIDAR) New Riverine Analysis New Coastal (Hurricane) Analysis New approach to analyzing and mapping along levees that cannot be shown as providing protection from the base flood 14

15 Economic 15

16 Economic Structures Impacted Effective Added Removed Proposed Riverine Coastal Totals Note: Counts do not necessarily sum because riverine and coastal floodplains overlap 16

17 Social Hard work is at the local level to Communicate risk Identify and drive mitigation opportunities Ensure and enable disaster preparedness Success can be achieved by using a communityoriented model Businesses, neighborhoods, faith-based organizations, ethnic groups, civic organizations, etc. Collaboration between and across ongoing efforts Land use planning and building codes Economic development efforts Capital improvement plans Critical infrastructure 17

18 Lessons Learned We are going to identify hazards and risk that is huge and in hundreds of areas it will take at least decades to bring flood risk into a tolerable range Many people don t care about existing flood risk, just what is depicted on a regulatory map as a result the opposition to new flood mapping will be large 18

19 Outreach Lessons Learned Public safety must be primary Coordination with elected officials is key Start outreach early it takes time Partner early and often; involving others is important and needed for success Put draft data online More outreach will be needed when revised flood zones go effective, not when issued in draft or preliminary format 19

20 Engineering Lessons Learned Less important than non-technical LAMP and PAL processes are helpful, albeit complicated, tools definitely not a cure-all Don t let the documentation and technical issues distract from the mapping Focus on identifying the floodplain Its About the Floodplain! 20

21 Other Lessons Learned Mapping raises the entire realm of levee issues A levee needs to be considered as part of a levee system for mapping Nothing Risk MAP does will reduce flood losses more than correctly identifying flood hazards behind deficient levees The effort necessary to correctly map flood hazards around levees is not too hard LAMP gives us all a uniform process and analysis procedures 21

22 Risk Communication We all will continue to struggle to effectively communicate hazards and flood risk But technology helps; 3-D viewers allow us to better understand flood hazards and flood risk; And therefore make appropriate floodplain management decisions in the future 22

23 Conclusion Levee deaccreditation is a challenging but necessary step if the we are to start reducing flood losses Public safety (not $$ and flood insurance implications) must drive decisions As we continue to build in floodplains we need to ensure accurate hazard and risk data is available to understand the consequences of this new development 23