Donaldsonville, LA to the Gulf of Mexico Feasibility Study

Existing Conditions Interior Drainage and Hurricane Surge Donaldsonville, LA to the Gulf of Mexico Feasibility Study U.S. Army Corps of Engineers New Orleans District 05/16/06

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 Interior Drainage Interior Drainage - HEC-HMS Schematic - HEC-HMS Schematic - HEC-RAS Drainage Area - HEC-RAS Drainage Area - Hurricane Allison Calibration - Hurricane Allison Calibration Hurricane Surge Hurricane Surge - ADCIRC Modeling - ADCIRC Modeling Typical Existing Conditions Typical Existing Conditions - Stage Frequency Curves - Stage Frequency Curves - Reach and Stage Data for Economic Analysis - Reach and Stage Data for Economic Analysis 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 Interior Drainage HEC – HMS and HEC –RAS Modeling HEC – HMS and HEC –RAS Modeling Interior Hydraulic Model of Existing Conditions Interior Hydraulic Model of Existing Conditions - Flows in bayous - Flows in bayous - Identify flow obstructions in current system - Identify flow obstructions in current system - Existing pump stations - Existing pump stations - Need for additional pump stations - Need for additional pump stations - Effects of additional freshwater diversions - Effects of additional freshwater diversions Analyze Future Conditions Analyze Future Conditions

Donaldsonville, LA to the Gulf of Mexico

HEC – HMS Schematic

Donaldsonville, LA to the Gulf of Mexico

SubbasinDrainage Area NumberDescriptionSquare Miles 1Between Pipeline Canals Raceland/Thibodaux, Bayou Boeuf/ Grand Bayou, SA2 Lake Boeuf 3Elmer/Choupique/Chegby Bayou Lac DesAllemands Bayou Chevreuil/Bayou Citamon Baker Canal South Baker Canal East Plattenville, Baker Canal North Donaldsonville, Bayou Napoleon Welcome, St. James Canal Bayou Verret SubbasinDrainage Area NumberDescriptionSquare Miles 11Lower Vacherie, Vacherie Canal Vacherie, Bayou Lassene/Brazan Canal Wallace Bayou Becnel Johnson Edgard, Bayou Lasseigne Killona, Bayou Fortier/ St. Charles Canal/ Providence Canal SA1Lake Des Allemands Mathews/Raceland/Des Allemands, Godchaux Canal, Hwy 90 20Baie Des Deux Chenes1.489 Sub-Watershed Areas

Donaldsonville, LA to the Gulf of Mexico SubbasinDrainage Area NumberDescriptionSquare Miles 21Hahnville, Eighty Arpent Canal, Paradis Canal 22Sunset Drainage District LaRose/Lockport, Tismond Foret Canal BayouVacherie, Company Canal 23Luling/Boutte, Cousins Canal, Davis Pond Freshwater Diversion Project 25Marrero/Westwego, Bayou Segnette SubbasinDrainage Area NumberDescriptionSquare Miles SA3Lake Cataoutche SA4Lake Salvador Avondale/Waggaman Near V-line levee Harvey/Gretna/Terrytown Belle Chase Algiers Stanton6.094

Donaldsonville, LA to the Gulf of Mexico HYD-35 TP=40 TP-49 Frequency5-min15-min1-hour2-hour3-hour6-hour12-hour24-hour2-day4-day7-day10-day 1-YR 2-YR YR YR YR YR YR YR YR YR Rainfall Depth – Duration Frequency

Donaldsonville, LA to the Gulf of Mexico ClassificationABC# D# Fresh Marsh Intermediate Marsh Brackish Marsh Saline Marsh Wetland Forest-Dec Wetland Forest-Ever Wetland Forest-Mix Upland Forest-Dec Upland Forest-Ever Upland Forest-Mix Dense Pine Thicket Wetland Scrub/Dec Wetland Scrub/Ever Wetland Scrub/Mix Upland Scrub/Dec Upland Scrub/Ever Habitat and Land Use Classification Curve Numbers

Donaldsonville, LA to the Gulf of Mexico ClassificationABC# D# Upland Scrub/Mix Agri-Cropland-Grass Vegetated Urban Non-Vegetated Urban Upland Barren Wetland Barren Wetland Complex85 Water100 Habitat and Land Use Classification Curve Numbers

Donaldsonville, LA to the Gulf of Mexico

HEC – RAS Drainage Areas

Donaldsonville, LA to the Gulf of Mexico

BAKER CANAL EAST BAKER CANAL NORTH BAKER CANAL SOUTH BAYOU BARATARIA BAYOU BECNEL BAYOU BOEUF BAYOU CHEVREUIL BAYOU CITAMON BAYOU DES ALLEMANDS BAYOU FORTIER BAYOU LASSEIGNE BAYOU LASSENE BAYOU PEROT BAYOU VACHERIE BAYOU VERRET BAYOU SEC / Bayou Verret South BRAZAN CANAL COMPANY CANAL COMPANY CANAL NORTH EIGHTY ARPENT CANAL FORTY ARPENT CANAL GIWW GODCHAUX CANAL GRAND BAYOU HALPIN CANAL LAC DES ALLEMANDS OLD & NEW U.S. HWY 90 PARADIS CANAL PIPELINE CANAL PIPELINE LOCATION CANALS / Monterey & Bowie Canals PROVIDENCE CANAL RL1 – CHOUPIQUE RL2 – CHACKBAY, CHEGBY BAYOUS & CANALS SURVEYS

Donaldsonville, LA to the Gulf of Mexico RL3 – CHOCTEAU RD. RL4 – LAUREL VALLEY RD. RL5 – LA PEANS RL6 – BAYOU BATON PILOU RL7 – KRAEMER RL8 – BAYOU ROND POMPON RL9 – BOEUF RL10 – BAYOU BOEUF RL11 – LOWER VACHERIE SAM FORET CANAL ST. CHARLES CANAL ST. JAMES CANAL EAST ST. JAMES CANAL SOUTH ST. JAMES CANAL NORTH THERIOT CANAL TISAMOND FORET CANAL VACHERIE CANAL BAYOU DES ALLEMANDS STRUCTURE LAKE BOEUF LAKE CATAOUATCHE LAKE SALVADOR BAYOU PEROT GIWW BAYOU SEGNETTE WATERWAY BAYOU BARATARIA WATERWAY ALGIERS CANAL HARVEY CANAL BAYOUS & CANALS SURVEYS CONTINUATION

Donaldsonville, LA to the Gulf of Mexico Tropical Storm Allison Calibration

Donaldsonville, LA to the Gulf of Mexico COMPARISON OF TROPICAL STORM ALLISON* HISTORICAL STAGES VS. HEC-RAS COMPUTED STAGES FOR SELECTED GAGE LOCATIONS (FT. NGVD) GAGE LOCATIONALLISON STAGEHEC-RAS STAGE Barataria Lafitte, LA Bayou Des Des Allemands, LA Bayou Lapalco Blvd., LA Intracoastal Harvey Lock, LA Intracoastal Algiers Lock, LA * Tropical Storm Allison 4 to 12 June, 2001.

Donaldsonville, LA to the Gulf of Mexico Hurricane Surge ADCIRC Modeling ADCIRC Modeling Hurricane Surge Model of Existing Conditions Hurricane Surge Model of Existing Conditions - Identify Hurricane Surge Heights - Identify Hurricane Surge Heights - Water Level Boundary Conditions for Interior Drainage - Water Level Boundary Conditions for Interior Drainage Analyze Future Conditions Analyze Future Conditions

Donaldsonville, LA to the Gulf of Mexico ADCIRC Modeling

Donaldsonville, LA to the Gulf of Mexico Typical Existing Conditions Stage – Frequency Curves HEC – RAC and ADCIRC Typical Existing Conditions Stage – Frequency Curves HEC – RAC and ADCIRC

Donaldsonville, LA to the Gulf of Mexico

Reach and Stage Data for Economic Analysis Reach and Stage Data for Economic Analysis

Donaldsonville, LA to the Gulf of Mexico

Frequency Existing Conditions Existing Alternatives (years)Stage (ft NAVD) RASADCIRC 1X XXXXX Location = Between Pipeline Canals Storage area = SA-1A Reach = 1A Type = Lowland Land Use = Wetland Forest – Deciduous & Fresh Marsh

Donaldsonville, LA to the Gulf of Mexico Frequency Existing Conditions Existing Alternatives (years)Stage (ft NAVD) RASADCIRC 1X XXXXX Location = Bayou Perot, Barataria Waterway Storage Area = Gulf Stream = GIWW Type = Lowland Land Use = Fresh Marsh& Wetlands; Forest – Deciduos & Water

Donaldsonville, LA to the Gulf of Mexico Future Activities

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

- Bayou Lafourche - Hwy 90 - Pipeline Canal - GIWW - West Bank & Vicinity Hurricane Protection West Bank HP Project

West Bank HP Project

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 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 30’ – 60’ Channel Cross-Section 1500 ’ Bayou Donaldsonville, LA to the Gulf of Mexico Water & Sediment Diversion Structures Houma Thibodaux Lafourche Parish GIWW Third Delta Conveyance Channel Third Delta Conveyance Channel 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”