1 New Orleans District Morganza to the Gulf 23 May 2008 Carl Anderson, Senior Project Manager, USACE

2 Morganza to the Gulf Purpose Reduce flood damages (10,000 homes flooded during Hurricane Rita, 3,000 severely damaged)Reduce flood damages (10,000 homes flooded during Hurricane Rita, 3,000 severely damaged) Reduce coastal wetlands lossReduce coastal wetlands loss Minimize adverse impacts on navigation and industryMinimize adverse impacts on navigation and industry Reduce flood damages (10,000 homes flooded during Hurricane Rita, 3,000 severely damaged)Reduce flood damages (10,000 homes flooded during Hurricane Rita, 3,000 severely damaged) Reduce coastal wetlands lossReduce coastal wetlands loss Minimize adverse impacts on navigation and industryMinimize adverse impacts on navigation and industry Hurricane Flood Damage

3 Morganza to the Gulf Authorized by Congress in WRDA 2007 Total Project Cost = $912M (Oct price levels) Cost-sharing 65%-35%Cost-sharing 65%-35% –LADOTD will be construction sponsor –TLCD will sponsor OMRRR

4 Morganza to the Gulf Project Features 64 Miles of Earthen Levee64 Miles of Earthen Levee 13 Sector Gate Structures for Flood Control13 Sector Gate Structures for Flood Control 13 Tidal Exchange Structures13 Tidal Exchange Structures Houma Navigation Canal Lock ComplexHouma Navigation Canal Lock Complex Mitigation for direct impacts would require creatingMitigation for direct impacts would require creating 1,352 acres of new marsh

5 Existing Hydrologic Barriers

6 System Wide Circulation Model

7 Larose GIWW Cocodrie B. Grand Caillou B. Lafourche GIWW Presquile Boudreaux B. Petit Caillou Lafourche Parish Lafourche Parish Terrebonne Parish Terrebonne Parish N N Bourg Ashland 56 Chauvin Dulac Morganza to the Gulf of Mexico Project Morganza to the Gulf of Mexico Project REACH A REACH B Sector Gates Houma Navigation Canal Lock and Sector Gate Houma Navigation Canal Lock and Sector Gate Work in Kind (WIK) Levees Recommended Alignment Montegut REACH E REACH F REACH H REACH G REACH I REACH K REACH L Houma REACH J-1 B. Terrebonne REACHJ-2REACHJ-2 REACHJ-3REACHJ-3 55

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9 Proposed Houma Navigation Canal Lock Complex Proposed Houma Navigation Canal Lock Complex Proposed Floodgate Right-of-Way Boundary B. GRAND CAILLOU Proposed Bypass Channel Proposed Closure Proposed Flood Gate Provides flood control, salinity control and enhanced navigation opportunitiesProvides flood control, salinity control and enhanced navigation opportunities Currently in detailed design of the lock complex which consists of a 110’ x 800’ lock and 250’ floodgateCurrently in detailed design of the lock complex which consists of a 110’ x 800’ lock and 250’ floodgate Proposed HNC Lock Proposed Access Road

10 Louisiana Coastal Area The Multi-purpose operation of Houma Navigation Canal (HNC) Lock is listed as a near term critical restoration feature in the final programmatic EIS for Louisiana Coastal Area Ecosystem Restoration Study for Subprovince 3.The Multi-purpose operation of Houma Navigation Canal (HNC) Lock is listed as a near term critical restoration feature in the final programmatic EIS for Louisiana Coastal Area Ecosystem Restoration Study for Subprovince 3. A Record of Decision for this FPEIS was signed in January 2005 and was authorized in Water Resources Development Act of 2007.A Record of Decision for this FPEIS was signed in January 2005 and was authorized in Water Resources Development Act of 2007.

11 LaCPR Draft Technical Report Lists the two primary structural alternative strategies considered for this area as the Morganza to the Gulf alternatives which are variations on the currently proposed 100-year Morganza to the Gulf project Lists the two primary structural alternative strategies considered for this area as the Morganza to the Gulf alternatives which are variations on the currently proposed 100-year Morganza to the Gulf project Also includes a set of GIWW alternatives, which would provide a second line of defense further inland along the Gulf Intracoastal Waterway Also includes a set of GIWW alternatives, which would provide a second line of defense further inland along the Gulf Intracoastal Waterway

12 Summary of Benefits Flood ProtectionFlood Protection –100-yr level of protection to be provided –Safeguard approximately 150,000 residents Safe HarborSafe Harbor –System would reduce damages, transportation and storage costs and increase navigation opportunities

13 Summary of Benefits Ecosystem ProtectionEcosystem Protection –Reduce saltwater intrusion and the frequency of wetland flooding for 83,000 acres of existing wetlands –Potential for managing freshwater flow and improving rapidly deteriorating wetlands Water SupplyWater Supply –Reduce annual water treatment costs, equipment replacement and maintenance costs –Reduce the need for capital projects Dredging/expansion of current reservoir or purchasing purification systemsDredging/expansion of current reservoir or purchasing purification systems

14 Current Efforts Hydraulic ModelingHydraulic Modeling –System wide analysis –Storm surge and wave modeling DesignDesign –HNC Lock Complex & adjacent features (50% design by summer 2008)

15 Current Efforts Revised Programmatic Environmental Impact Statement (RPEIS)Revised Programmatic Environmental Impact Statement (RPEIS) – Includes lock as constructible feature – Completion expected in summer 2009 Post Authorization Change Report (PAC)Post Authorization Change Report (PAC) –Completion expected in summer 2009

16 Work by Sponsor Construction of Levee Reach J-1Construction of Levee Reach J-1 Design of Levee Reaches J-2, H-2, H-3, & Point aux ChenesDesign of Levee Reaches J-2, H-2, H-3, & Point aux Chenes Design of access road for lockDesign of access road for lock Coordinating with federal and state agenciesCoordinating with federal and state agencies

17 Project Web Page /prj/mtog/