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New Orleans DistrictNew Orleans District

Morganza to the GulfMorganza to the Gulf

23 May 200823 May 2008

Carl Anderson, Senior Project Manager, USACE

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Morganza to the GulfMorganza to the GulfPurposePurpose

Morganza to the GulfMorganza to the GulfPurposePurpose

• Reduce flood damages Reduce flood damages (10,000 homes flooded (10,000 homes flooded during Hurricane Rita, during Hurricane Rita, 3,000 severely 3,000 severely damaged)damaged)

• Reduce coastal Reduce coastal wetlands losswetlands loss

• Minimize adverse Minimize adverse impacts on navigation impacts on navigation and industryand industry

• Reduce flood damages Reduce flood damages (10,000 homes flooded (10,000 homes flooded during Hurricane Rita, during Hurricane Rita, 3,000 severely 3,000 severely damaged)damaged)

• Reduce coastal Reduce coastal wetlands losswetlands loss

• Minimize adverse Minimize adverse impacts on navigation impacts on navigation and industryand industry

Hurricane Flood DamageHurricane Flood Damage

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Morganza to the GulfMorganza to the Gulf

Authorized by Congress in WRDA 2007Authorized by Congress in WRDA 2007

Total Project Cost = $912M Total Project Cost = $912M (Oct. 2007 price levels)(Oct. 2007 price levels)

• Cost-sharing 65%-35%Cost-sharing 65%-35%– LADOTD will be construction sponsorLADOTD will be construction sponsor

– TLCD will sponsor OMRRR TLCD will sponsor OMRRR

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Morganza to the GulfMorganza to the Gulf

Project FeaturesProject 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 creating Mitigation for direct impacts would require creating

1,352 acres of new marsh1,352 acres of new marsh

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Existing Hydrologic BarriersExisting Hydrologic Barriers

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System Wide Circulation ModelSystem Wide Circulation Model

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LaroseLaroseGIWWGIWW

CocodrieCocodrieB. G

rand

Cai

llou

B. G

rand

Cai

llou

B. L

afou

rche

B. L

afou

rche

GIWWGIWWPresquilePresquile

BoudreauxBoudreaux

B. P

etit

Cai

llou

B. P

etit

Cai

llou

Lafourche Parish

Lafourche Parish

Terrebonne Parish

Terrebonne Parish

NNBourgBourg

AshlandAshland 56

ChauvinChauvin

57

315

DulacDulac

Morganza to the Gulf of Mexico

Project

Morganza to the Gulf of Mexico

Project

REACH AREACH AREACH AREACH A

REACH BREACH BREACH BREACH B

Sector GatesSector GatesSector GatesSector Gates

Houma Navigation Canal Lock Houma Navigation Canal Lock and Sector Gateand Sector GateHouma Navigation Canal Lock Houma Navigation Canal Lock and Sector Gateand Sector Gate

Work in Kind (WIK) LeveesWork in Kind (WIK) LeveesWork in Kind (WIK) LeveesWork in Kind (WIK) Levees

Recommended AlignmentRecommended AlignmentRecommended AlignmentRecommended Alignment

MontegutMontegut

REACH EREACH EREACH EREACH E

REACH FREACH FREACH FREACH F

REACH HREACH HREACH HREACH H

REACH GREACH GREACH GREACH G

REACH IREACH IREACH IREACH I

REACH KREACH KREACH KREACH K

REACH LREACH LREACH LREACH L

HoumaHouma

REACHJ-1

B. T

erre

bo

nn

e

B. T

erre

bo

nn

e REACHREACHJ-2J-2

REACHREACHJ-2J-2

REACHREACHJ-3J-3

REACHREACHJ-3J-3

55

8

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Proposed Houma NavigationProposed Houma NavigationCanal Lock ComplexCanal Lock Complex

Proposed Houma NavigationProposed Houma NavigationCanal Lock ComplexCanal Lock Complex

Proposed Proposed FloodgateFloodgate

Right-of-Way Right-of-Way BoundaryBoundary

B. G

RA

ND

CA

ILLO

U

B. G

RA

ND

CA

ILLO

U

Proposed Proposed Bypass Bypass ChannelChannel

Proposed Proposed ClosureClosureProposed Proposed

Flood GateFlood Gate

• Provides flood control, Provides flood control, salinity control and salinity control and enhanced navigation enhanced navigation opportunitiesopportunities

• Currently in detailed Currently in detailed design of the lock design of the lock complex which consists complex which consists of a 110’ x 800’ lock of a 110’ x 800’ lock and 250’ floodgateand 250’ floodgate

Proposed Proposed HNC LockHNC Lock

Proposed Proposed Access Access RoadRoad

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Louisiana Coastal AreaLouisiana Coastal Area

• The Multi-purpose operation of Houma The Multi-purpose operation of Houma Navigation Canal (HNC) Lock is listed as a Navigation Canal (HNC) Lock is listed as a near term critical restoration feature in the near term critical restoration feature in the final programmatic EIS for Louisiana final programmatic EIS for Louisiana Coastal Area Ecosystem Restoration Study Coastal Area Ecosystem Restoration Study for Subprovince 3.for Subprovince 3.

• A Record of Decision for this FPEIS was A Record of Decision for this FPEIS was signed in January 2005 and was signed in January 2005 and was authorized in authorized in Water Resources Water Resources Development Act of 2007.Development Act of 2007.

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LaCPR Draft Technical ReportLaCPR Draft Technical Report

• Lists the two primary structural alternative Lists the two primary structural alternative strategies considered for this area as the strategies considered for this area as the Morganza to the Gulf alternatives which are Morganza to the Gulf alternatives which are variations on the currently proposed 100-year variations on the currently proposed 100-year Morganza to the Gulf project Morganza to the Gulf project

• Also includes a set of GIWW alternatives, which Also includes a set of GIWW alternatives, which would provide a second line of defense further would provide a second line of defense further inland along the Gulf Intracoastal Waterwayinland along the Gulf Intracoastal Waterway

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Summary of Benefits

• Flood ProtectionFlood Protection– 100-yr level of protection to be provided100-yr level of protection to be provided– Safeguard approximately 150,000 residentsSafeguard approximately 150,000 residents

• Safe HarborSafe Harbor– System would reduce damages, transportation System would reduce damages, transportation

and storage costs and increase navigation and storage costs and increase navigation opportunitiesopportunities

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Summary of BenefitsSummary of Benefits

• Ecosystem ProtectionEcosystem Protection– Reduce saltwater intrusion and the frequency of Reduce saltwater intrusion and the frequency of

wetland flooding for 83,000 acres of existing wetland flooding for 83,000 acres of existing wetlandswetlands

– Potential for managing freshwater flow and Potential for managing freshwater flow and improving rapidly deteriorating wetlandsimproving rapidly deteriorating wetlands

• Water Supply Water Supply – Reduce annual water treatment costs, equipment Reduce annual water treatment costs, equipment

replacement and maintenance costsreplacement and maintenance costs

– Reduce the need for capital projectsReduce the need for capital projects• Dredging/expansion of current reservoir or purchasing Dredging/expansion of current reservoir or purchasing

purification systemspurification systems

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Current EffortsCurrent Efforts

• Hydraulic ModelingHydraulic Modeling– System wide analysisSystem wide analysis

– Storm surge and wave modelingStorm surge and wave modeling

• DesignDesign– HNC Lock Complex & adjacent features HNC Lock Complex & adjacent features

(50% design by summer 2008)(50% design by summer 2008)

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Current EffortsCurrent Efforts

• Revised Programmatic Environmental Revised Programmatic Environmental Impact Statement (RPEIS)Impact Statement (RPEIS)– Includes lock as constructible featureIncludes lock as constructible feature– Completion expected in summer 2009Completion expected in summer 2009

• Post Authorization Change Report Post Authorization Change Report (PAC)(PAC)– Completion expected in summer 2009Completion expected in summer 2009

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Work by SponsorWork by Sponsor

• Construction of Levee Reach J-1Construction of Levee Reach J-1

• Design of Levee Reaches J-2, H-2, H-3, Design of Levee Reaches J-2, H-2, H-3, & Point aux Chenes& Point aux Chenes

• Design of access road for lockDesign of access road for lock

• Coordinating with federal and state Coordinating with federal and state agenciesagencies

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Project Web PageProject Web Page

http://www.mvn.usace.army.milhttp://www.mvn.usace.army.mil/prj/mtog//prj/mtog/