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Morganza to the Gulf of Mexico Project State & Local Views and Path Forward

Morganza to the Gulf of Mexico Project State & Local Views and Path Forward. Jerome Zeringue CPRA. Morganza Technical Review Panel. CPRA Convened a Panel of Experts to Evaluate and Report Findings on Morganza Project

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Morganza to the Gulf of Mexico Project State & Local Views and Path Forward

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  1. Morganza to the Gulf of Mexico ProjectState & Local ViewsandPath Forward Jerome Zeringue CPRA

  2. Morganza Technical Review Panel CPRA Convened a Panel of Experts to Evaluate and Report Findings on Morganza Project Consider Projects Reliability to Provide Flood Reduction and Environmental Benefits that can be Provided by the Authorized Project

  3. Morganza Technical Review PanelRecommendations • IMPLEMENTATION • Continue Work on Levees, Floodgates & Environmental Structures – Authorized Alignment • Continue Work on the HNC Lock Complex • Integrate proactive wetlands restoration approach • Routinely (~ every 5 years) Evaluate Project to reassess • Risk to Communities • Ecosystem Sustainability

  4. Morganza Technical Review PanelRecommendations • PLANNING • Initiate Comprehensive Community Based Planning Process • Increase Efforts to Inform Business Community & General Public – Level of Protection and Risk Reduction • Implement Comprehensive Flood Management Approach • Non-Structural • Incentivize options for businesses & general public • Conservation Easements, Land Use Plans, Zoning

  5. If you are asked, I would just encourage parish officials who are interested in using some of their Gustav/Ike parish allocation for coastal/restoration projects to begin drafting descriptions of projects they are considering and providing those to us (Myself, Pat Forbes, KVO, Robin, Lynn or Sandra). We have not received approval of our action plan yet so we can not say with certainty what will be eligible. Then we will conduct outreach over the next few months to outline for parishes what coastal protection work can be funded by CDBG. If you are asked, I would just encourage parish officials who are interested in using some of their Gustav/Ike parish allocation for coastal/restoration projects to begin drafting descriptions of projects they are considering and providing those to us (Myself, Pat Forbes, KVO, Robin, Lynn or Sandra). We have not received approval of our action plan yet so we can not say with certainty what will be eligible. Then we will conduct outreach over the next few months to outline for parishes what coastal protection work can be funded by CDBG. Morganza Technical Review PanelRecommendations • TOOLS & ANALYSIS • Develop System wide Model • Ecosystem sustainability (operation of environ. structures) • Hold Workshop/Convene Panel • Develop knowledge of effects of flooding & salinity changes • Evaluate project impacts to wetlands • Apply Planning Tools • Consideration/Planning: future economic, social and environmental scenarios • Guide future phases of project construction, prioritization

  6. Morganza to the Gulf of Mexico Risk Reduction Project New Orleans District Briefing on Analysis of Alternative Alignments Carl Anderson, Senior Project Manager 14 January 2009

  7. Hurricane Katrina/Rita Impacts • Design Criteria • New Hydraulic Analysis for 100-year Surge Levels and Waves • New Hydraulic Standards for Wave Run-Up and Overtopping • New Geotechnical and Structural Design Standards • Borrow Composition and Compaction Standards • New Method for Stability Analysis; Higher Factor of Safety • Wider Levee Base, Increased Footprint • More than an 60% Increase in Elevations • More than a 300% Increase in Base Widths • Increase in Quantities • Borrow Material • Mitigation • Real Estate • Unit Price Increases

  8. Comparison of Similar Levee Cross-Sections Current 100-year Cross-Section superimposed on Authorized Cross Section Levee Cross-Section – changes due to Katrina/Rita – > 60% increase in height - 15’ to 28’ – > 300% increase in base width - 200’ to 725’

  9. Environmental Analysis • Considerations: • Estimated direct impacts on bottomland hardwoods and marsh for each of the 4 alternative footprints • All alternatives utilized top 5 ft organic material from adjacent borrow pits to create marsh; resulted in surplus marsh creation over mitigation requirement • More detailed wetland impact study needed for Revised Programmatic Environmental Impact Statement

  10. Alternative # 1: Authorized Alignment at Post-Katrina 100-year Elevations Levee Length – 64.6 miles 10

  11. Alternative# 2: Feasibility Alternative #5 at Post-Katrina 100-year Elevations Levee Length – 55.2 miles

  12. Alternative 3: Multiple Lines of Defense (NGO Plan) at Post-Katrina 100-year Elevations Levee Length – 63.0 miles

  13. Alternative # 4: Authorized Alignment at Post-Katrina 25-year Elevations (Pre-Katrina 100-year Elevations) Levee Length – 64.6 miles

  14. Project Cost for Alternatives by Account

  15. Comparison of Alternatives

  16. Findings • Results of Analysis (2008) • Authorized alignment: • Follows the Congressional authorized alignment • Provides risk reduction • Reduces salt water intrusion for the largest project area; therefore, incorporating the most residences and businesses within the system. • 80% of the authorized alignment overlays existing hydrologic barriers so the levee system will cause fewer impacts to the existing water circulation • Confirmed as the best possible alignment • Terrebonne Levee and Conservation District supports construction of authorized project at Post-Katrina 25-year elevations (Alternative 4) • Analysis supports justification for proceeding to Post Authorization Change Report

  17. Summary and Follow on Actions • Prepare Post Authorization Change Report • Revise Programmatic Environmental Impact Statement (RPEIS) • Proceed with 100% Plans & Specifications on the Houma Navigation Canal Lock Complex prior to completing PAC • Obtain Congressional Re-Authorization and Appropriation

  18. HOUMA BOURG LAROSE GULF INTRACOASTAL WATERWAY REACH J-1 CUT OFF BAYOU TERREBONNE REACH J-2 7/1/2009 BAYOU POINT AUX CHENES MONTEGUT LAKE THERIOT BAYOU GRAND CAILLOU REACH E 2/1/2010 CHAUVIN THERIOT HOUMA NAVIGATION CANAL BAYOU DULARGE BAYOU LITTLE CAILLOU DULAC POINTE AUX CHENES LAKE BOUDREAUX LAKE DECADE REACH G 2/1/2010 BAYOU POINT AUX CHENES 12/1/2009 REACH J-3 2/1/2010 BUSH CANAL 12/1/2009 REACH F 2/1/2010 REACH H3 1/15/2009 BAYOU GRAND CAILLOU 12/1/2009 HOUMA NAVIGATION CANAL 12/1/2009 PLACID CANAL 12/1/2009 REACH H2 2/1/2010 REACH H1 2/1/2010

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