Donaldsonville, LA to the Gulf of Mexico Feasibility Study

Existing Conditions Interior Drainage and Hurricane Surge by Reynold Broussard Existing Conditions Interior Drainage and Hurricane Surge by Reynold Broussard U.S. Army Corps of Engineers New Orleans District 06/07/07

Donaldsonville, Louisiana to the Gulf of Mexico Donaldsonville, Louisiana to the Gulf of Mexico New Orleans District Boundary LakePontchartrainLakePontchartrain Gulf of Mexico Study Area Baton Rouge New Orleans Donaldsonville AlexandriaAlexandria

Donaldsonville, LA to the Gulf of Mexico TopicsTopics Typical Existing Conditions Typical Existing Conditions - Reach and Stage Data for Economic Analysis - Reach and Stage Data for Economic Analysis Hurricane Surge Hurricane Surge - ADCIRC Modeling - ADCIRC Modeling Future Activities Future Activities - Levee Alternatives - Levee Alternatives - Water and Sediment Diversion Structures - Water and Sediment Diversion Structures

Study Objectives Study Objectives Hurricane Protection Hurricane Protection Interior Drainage Interior Drainage Eco-system Restoration Eco-system Restoration Corps of Engineers New Orleans District

Donaldsonville, LA to the Gulf of Mexico

HEC – RAS Drainage Areas

Donaldsonville, LA to the Gulf of Mexico

ADCIRC Modeling

Donaldsonville, LA to the Gulf of Mexico Existing Conditions Stages Existing Conditions Stages (ft., NAVD ) (ft., NAVD ) Existing Conditions Stages Existing Conditions Stages (ft., NAVD ) (ft., NAVD )

Donaldsonville, LA to the Gulf of Mexico Current Levee Alignments Being Studied

Terrebonne Parish Terrebonne Parish Houma Donaldsonville Thibodaux Laplace Des Allemands Metairie GIWW Lake Salvador Lake Salvador Lake Cataouatche Lake Cataouatche Lac Des Allemands Lac Des Allemands ISSIPPI RIVER BAYOU LAFOURCHE Lafourche Parish Lafourche Parish St. Charles Parish St. Charles Parish St. James Parish St. James Parish Donaldsonville, LA to the Gulf of Mexico Possible Hurricane Levee Alignments Jefferson Parish Jefferson Parish Bayou Lafourche Hwy 90 Pipeline Canal GIWW Existing Hurricane Protection Levee Bayou Lafourche Hwy 90 Pipeline Canal GIWW Existing Hurricane Protection Levee Larose to Golden Meadow Hurricane Protection Larose to Golden Meadow Hurricane Protection West Bank & Vicinity Hurricane Protection West Bank & Vicinity Hurricane Protection St. John Parish St. John Parish Luling Larose MISS

Terrebonne Parish Terrebonne Parish Houma Donaldsonville Thibodaux Laplace Des Allemands Metairie GIWW Lake Salvador Lake Salvador Lake Cataouatche Lake Cataouatche Lac Des Allemands Lac Des Allemands Mississippi River Bayou Lafourche Parish Lafourche Parish St. Charles Parish St. Charles Parish St. James Parish St. James Parish St. John Parish St. John Parish Donaldsonville, LA to the Gulf of Mexico Possible GIWW Levee Alignments Jefferson Parish Jefferson Parish Luling GIWW Alignment Existing Hurricane Protection Levee GIWW Alignment Existing Hurricane Protection Levee Larose Larose to Golden Meadow Hurricane Protection Larose to Golden Meadow Hurricane Protection West Bank & Vicinity Hurricane Protection West Bank & Vicinity Hurricane Protection Plaquemines Parish Non-Fed Levees Plaquemines Parish Non-Fed Levees

West Bank & Vicinity, New Orleans, LA, Hurricane Protection Project West Bank & Vicinity, New Orleans, LA, Hurricane Protection Project 90 AMES P.S. OAK COVE P.S. New Orleans COUSINS P.S. LAKE CATAOUATCHE NEW WESTWEGO P.S. OLD WESTWEGO P.S. B. SEGNETTE HERO CANAL ALGIERS HARVEY CANAL ALGIERS LOCK CANAL HARVEY LOCK MISSISSIPPI RIVER ESTELLE P.S. LAKE SALVADOR Existing Pumping Stations Project Levees/Floodwalls Road Floodgate Structure MT. KENNEDY P.S. N.O. S&WB P.S. #11 SEGNETTE P.S. HARVEY P.S. 45 NEW ESTELLE P.S. HERO P.S. HERO P.S. PLANTERS P.S. PLANTERS P.S. BELLE CHASSE #2 P.S. N.O. S&WB P.S. #13 LakeCataouatcheAreaLakeCataouatcheArea EastofHarvey Canal Area EastofHarvey Westwego to Harvey Canal Area Westwego to Harvey Canal Area PLAQUEMINES P.S. 23

Donaldsonville, LA to the Gulf of Mexico Option ft. wide floodgate/navigation structures ft. wide floodgate/navigation structures Head loss at structure and max. head for alignment Head loss at structure and max. head for alignment Velocity Velocity Option 2 - Structures from Option 1 plus tidal exchange (TEX) structures - Structures from Option 1 plus tidal exchange (TEX) structures Velocity ~ 2.6 fps Velocity ~ 2.6 fps Option 3 - Structures from Options 1 and 2 plus additional TEX structures - Structures from Options 1 and 2 plus additional TEX structures Head loss ~ 0.5 ft Head loss ~ 0.5 ft Option ft. wide floodgate/navigation structures ft. wide floodgate/navigation structures Head loss at structure and max. head for alignment Head loss at structure and max. head for alignment Velocity Velocity Option 2 - Structures from Option 1 plus tidal exchange (TEX) structures - Structures from Option 1 plus tidal exchange (TEX) structures Velocity ~ 2.6 fps Velocity ~ 2.6 fps Option 3 - Structures from Options 1 and 2 plus additional TEX structures - Structures from Options 1 and 2 plus additional TEX structures Head loss ~ 0.5 ft Head loss ~ 0.5 ft

Terrebonne Parish Terrebonne Parish Houma Donaldsonville Thibodaux GIWW Lake Salvador Lake Salvador Lake Cataouatche Lake Cataouatche Lac Des Allemands Lac Des Allemands Lafourche Parish Lafourche Parish St. Charles Parish St. Charles Parish St. James Parish St. James Parish Jefferson Parish Jefferson Parish Hwy 90 Alignment Existing Hurricane Protection Levee Hwy 90 Alignment Existing Hurricane Protection Levee Larose to Golden Meadow Hurricane Protection Larose to Golden Meadow Hurricane Protection West Bank & Vicinity Hurricane Protection West Bank & Vicinity Hurricane Protection Plaquemines Parish Non-Fed Levees Plaquemines Parish Non-Fed Levees RIVER MISS ISS BAYOU LAFOURCHE IPPI D ES A LLEMANDS ft wide navigational gate Maximum head loss: 0.01 ft. Maximum velocity: 0.73 ft./s D ES A LLEMANDS ft wide navigational gate Maximum head loss: 0.01 ft. Maximum velocity: 0.73 ft./s Larose Luling

Houma Donaldsonville Thibodaux GIWW Hwy 90 Alignment Existing Hurricane Protection Levee Hwy 90 Alignment Existing Hurricane Protection Levee Larose to Golden Meadow Hurricane Protection Larose to Golden Meadow Hurricane Protection RIVER MISS ISS BAYOU LAFOURCHE IPPI D ES A LLEMANDS ft wide navigational gate 3-20 ft wide gates Maximum head loss: 0.01 ft. Maximum velocity: 0.47 ft./s D ES A LLEMANDS ft wide navigational gate 3-20 ft wide gates Maximum head loss: 0.01 ft. Maximum velocity: 0.47 ft./s Larose P ARADIS 3-10 ft wide gates Maximum head loss: 0.03 ft. Maximum velocity: 4.02 ft./s P ARADIS 3-10 ft wide gates Maximum head loss: 0.03 ft. Maximum velocity: 4.02 ft./s West Bank & Vicinity Hurricane Protection West Bank & Vicinity Hurricane Protection Plaquemines Parish Non-Fed Levees Plaquemines Parish Non-Fed Levees C OMPANY C ANAL 1-15 ft wide gate Maximum head loss: 0.02 ft. Maximum velocity: 2.09 ft./s C OMPANY C ANAL 1-15 ft wide gate Maximum head loss: 0.02 ft. Maximum velocity: 2.09 ft./s B AYOU V ACHERIE 1-10 ft wide gate Maximum head loss: 0.02 ft. Maximum velocity: 1.62 ft./s B AYOU V ACHERIE 1-10 ft wide gate Maximum head loss: 0.02 ft. Maximum velocity: 1.62 ft./s T ISAMOND F ORET C ANAL 3-10 ft wide gates Maximum head loss: 0.34 ft. Maximum velocity: 0.83 ft./s T ISAMOND F ORET C ANAL 3-10 ft wide gates Maximum head loss: 0.34 ft. Maximum velocity: 0.83 ft./s Luling P ARADIS 3-10 ft wide gates Maximum head loss: 0.00 ft. Maximum velocity: 0.00 ft./s P ARADIS 3-10 ft wide gates Maximum head loss: 0.00 ft. Maximum velocity: 0.00 ft./s

Houma Donaldsonville Thibodaux GIWW Lake Salvador Lake Salvador Lac Des Allemands Lac Des Allemands Pipeline Alignment Existing Hurricane Protection Levee Pipeline Alignment Existing Hurricane Protection Levee Larose to Golden Meadow Hurricane Protection Larose to Golden Meadow Hurricane Protection West Bank & Vicinity Hurricane Protection West Bank & Vicinity Hurricane Protection Plaquemines Parish Non-Fed Levees Plaquemines Parish Non-Fed Levees RIVER MISS ISS BAYOU LAFOURCHE IPPI Larose Lafourche Parish Lafourche Parish Luling B AYOU G AUCHE ft wide navigational gate Maximum head loss: 0.01 ft. Maximum velocity: 1.40 ft./s B AYOU G AUCHE ft wide navigational gate Maximum head loss: 0.01 ft. Maximum velocity: 1.40 ft./s D ES A LLEMANDS ft wide navigational gate Maximum head loss: 0.01 ft. Maximum velocity: 2.11 ft./s D ES A LLEMANDS ft wide navigational gate Maximum head loss: 0.01 ft. Maximum velocity: 2.11 ft./s

Houma Donaldsonville Thibodaux GIWW Lake Salvador Lake Salvador Lac Des Allemands Lac Des Allemands Pipeline Alignment Existing Hurricane Protection Levee Pipeline Alignment Existing Hurricane Protection Levee Larose to Golden Meadow Hurricane Protection Larose to Golden Meadow Hurricane Protection West Bank & Vicinity Hurricane Protection West Bank & Vicinity Hurricane Protection Plaquemines Parish Non-Fed Levees Plaquemines Parish Non-Fed Levees RIVER MISS ISS BAYOU LAFOURCHE IPPI Larose Luling D ES A LLEMANDS ft wide navigational gate Maximum head loss: 0.02 ft. Maximum velocity: 2.07 ft./s D ES A LLEMANDS ft wide navigational gate Maximum head loss: 0.02 ft. Maximum velocity: 2.07 ft./s T ISAMOND F ORET C ANAL 3-10 ft wide navigational gate Maximum head loss: 0.34 ft. Maximum velocity: 0.83 ft./s T ISAMOND F ORET C ANAL 3-10 ft wide navigational gate Maximum head loss: 0.34 ft. Maximum velocity: 0.83 ft./s C OMPANY C ANAL 1-15 ft wide gate Maximum head loss: 0.02 ft. Maximum velocity: 2.09 ft./s C OMPANY C ANAL 1-15 ft wide gate Maximum head loss: 0.02 ft. Maximum velocity: 2.09 ft./s B AYOU G AUCHE ft wide navigational gate Maximum head loss: 0.01 ft. Maximum velocity: 1.38 ft./s B AYOU G AUCHE ft wide navigational gate Maximum head loss: 0.01 ft. Maximum velocity: 1.38 ft./s B AYOU V ACHERIE 1-10 ft wide gate Maximum head loss: 0.02 ft. Maximum velocity: 1.62 ft./s B AYOU V ACHERIE 1-10 ft wide gate Maximum head loss: 0.02 ft. Maximum velocity: 1.62 ft./s

Terrebonne Parish Terrebonne Parish Houma Donaldsonville Thibodaux GIWW Lake Salvador Lake Salvador Lake Cataouatche Lake Cataouatche Lac Des Allemands Lac Des Allemands Lafourche Parish Lafourche Parish Luling GIWW Alignment Existing Hurricane Protection Levee GIWW Alignment Existing Hurricane Protection Levee Larose to Golden Meadow Hurricane Protection Larose to Golden Meadow Hurricane Protection West Bank & Vicinity Hurricane Protection West Bank & Vicinity Hurricane Protection Plaquemines Parish Non-Fed Levees Plaquemines Parish Non-Fed Levees RIVER MISS ISS BAYOU LAFOURCHE IPPI B ARTARIA B AY W ATERWAY ft wide navigational gate Maximum head loss: 0.01 ft. Maximum velocity: 4.39 ft./s B ARTARIA B AY W ATERWAY ft wide navigational gate Maximum head loss: 0.01 ft. Maximum velocity: 4.39 ft./s B AYOU P EROT ft wide navigational gate Maximum head loss: 0.02 ft. Maximum velocity: 7.98 ft./s B AYOU P EROT ft wide navigational gate Maximum head loss: 0.02 ft. Maximum velocity: 7.98 ft./s Larose

Terrebonne Parish Terrebonne Parish Houma Donaldsonville Thibodaux GIWW Lake Salvador Lake Salvador Lake Cataouatche Lake Cataouatche Lac Des Allemands Lac Des Allemands Lafourche Parish Lafourche Parish Luling GIWW Alignment Existing Hurricane Protection Levee GIWW Alignment Existing Hurricane Protection Levee Larose to Golden Meadow Hurricane Protection Larose to Golden Meadow Hurricane Protection West Bank & Vicinity Hurricane Protection West Bank & Vicinity Hurricane Protection Plaquemines Parish Non-Fed Levees Plaquemines Parish Non-Fed Levees RIVER MISS ISS BAYOU LAFOURCHE IPPI B AYOU P EROT ft wide structure AND ft wide tidal interchange structures Maximum head loss: 0.01 ft. Maximum velocity: 2.63 ft./s B AYOU P EROT ft wide structure AND ft wide tidal interchange structures Maximum head loss: 0.01 ft. Maximum velocity: 2.63 ft./s Larose B ARTARIA B AY W ATERWAY ft wide structure AND 6-20 ft wide tidal interchange structures Maximum head loss: 0.00 ft. Maximum velocity: 2.37 ft./s ft wide structure AND 6-20 ft wide tidal interchange structures Maximum head loss: 0.00 ft. Maximum velocity: 2.37 ft./s

Donaldsonville, LA to the Gulf of Mexico Water and Sediment Diversion Structures

Donaldsonville Laplace Des Allemands Metairie Lake Salvador Lake Salvador Lake Cataouatche Lake Cataouatche Lac Des Allemands Lac Des Allemands Mississippi River Lafourche Terrebonne Parish Terrebonne Parish Jefferson Parish Jefferson Parish St. Charles Parish St. Charles Parish St. James Parish St. James Parish St. John Parish St. John Parish Larose Luling Bayou Donaldsonville, LA to the Gulf of Mexico Water & Sediment Diversion Structures Houma Thibodaux Lafourche Parish GIWW Water Diversion Structures Water Diversion Structures

Donaldsonville, LA to the Gulf of Mexico Reynold Broussard Hydraulics and Hydrologic Branch (504) (504) fax Frank Duarte Project Manager (504) (504) fax Study Website: Below the List of Projects click on “Mississippi River & Tributaries (MRT)” click on “Donaldsonville to the Gulf of Mexico”