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Feasibility Study Overview

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Louisiana Coastal Area. Ecosystem Restoration. 19 September 2000. USACE Recon Report: ... Diversion at Bastian Bay. R2-22. Restore/maintain. Barrier Shoreline, ... – PowerPoint PPT presentation

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Title: Feasibility Study Overview


1
Feasibility Study Overview
Louisiana Coastal AreaEcosystem Restoration 19
September 2000
2
Louisiana Coastal Area (LCA) Feasibility Study
  • USACE Recon Report
  • Supports Coast 2050 Plan
  • Approved for feasibility study start May 99
  • General Investigations study authorization
  • LCA 1967 multi-purpose authority
  • Current use ecosystem restoration (no B/C ratio)
  • LA Dept. of Natural Resources non-Fed Sponsor
  • Feb 00 study start 50/50 cost share
  • Project authorization and funding vehicle
    Water Resources Development Act (WRDA)

3
Red River
Louisiana Coastal Area (LCA) Authorized Study Area
Texas
Louisiana
Mississippi
Mississippi River
Atchafalya River
I-10
I-12
I-10
Causeway
I-10
Hwy 1
Hwy 27
GIWW
GIWW
Hwy 27
Hwy 90
GIWW
Hwy 90
Hwy 46
Hwy 82
Bayou Lafourche
Hwy 301
GIWW
Hwy 23
Hwy 1
Gulf of Mexico
4
LCA Study Organization
  • DNR/COE Partnering
  • Executive Committee
  • Senior Management Committee
  • Project Management Committee
  • Multi-agency and stakeholder representation
  • Technical Advisory Committee
  • Study Data and Information Management
  • USGS National Wetlands Research Center (NWRC)

5
LCA Study EIS Partnering
  • Agencies
  • FWS, NMFS, WLF, MMS, DNR, EPA, COE
  • Laws
  • NEPA compliance
  • FW Coordination Act
  • Endangered Species Act
  • Essential Fish Habitat
  • Use of U.S. offshore sand resources
  • Coastal Zone Management

6
LCA Study Steps -- General
  • Start with Coast 2050 Plan
  • Develop Purpose and Need Statements for critical
    strategies
  • Conduct public scoping to shape study
  • Perform data collection
  • Formulate alternative restoration plans
  • Analyze alternative restoration plans
  • Compare plans
  • Recommendation Plan(s)

7
LCA Study Interaction Process
  • DNR/COE organizes/prepares for each step
  • Ensures all facets to conduct work in place
  • Keeps study on course
  • Conduct Technical Advisory Committee workshops
  • Team interaction on technical level
  • Shapes study direction
  • Conduct meetings with Barataria-Terrebonne
    National Estuary Program
  • Receive valuable input on regional issues
  • Shapes study direction
  • Conduct public meetings
  • Receive valuable input on public
    concerns/interests
  • Shapes study direction

8
Going Hi-Tech with NWRC
  • GIS/Database Support
  • Reservoir for data/info storage/recall
  • Analytical tool for organized data/info queries
  • Web Site Support
  • 24-hr interface with public
  • Study info posted
  • Receipt of comments
  • 24-hr interface with Technical Advisory Committee
  • Draft study data posted
  • Two-way transfer medium -- technical info

9
Approach for Barataria Study
  • Phase I Report
  • Focus -- Coastal perimeter
  • Wetland creation and restoration
  • Barrier shoreline restoration
  • River diversion
  • Ecosystem Restoration Objectives
  • Rebuild, protect shoreline, back marshes
  • Provide support to basin interior for restoration

10
Approach for Barataria Study
  • Prep for Phase II Study
  • Develop Hydrodynamic basin model
  • Existing conditions
  • Objective
  • Prepare to analyze water-related
    interior basin strategies

11
Barrier Island Restoration, Marsh Creation, and
River Diversion, Barataria Basin
Phase I Study - current
Potential Addition
R2-11. Delta Building Diversion at Bastian Bay
R2-16. Dedicated Dredging for Marsh Creation
along Hwy. 1
R2-17. Dedicated Dredging for Marsh Building in
Caminada Bay
R2-22. Restore/maintain Barrier Shoreline,
Port Fourchon to Sandy Point
12
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13
Alternatives for InvestigationMarsh Creation
Strategies
  • Marsh Creation Alternatives
  • Dredged materials placement
  • Terracing
  • Vegetative Plantings
  • Borrow site alternatives
  • Adjacent lakes and bays
  • Offshore
  • Three scales of analysis each alternative

14
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15
Alternatives for Investigation Barrier Island
Restoration Strategy
  • Barrier Island Restoration Alternatives
  • Dredge and place (e.g. beach, dune, back marsh)
  • Coastal structures (e.g. breakwaters, groins,
    revetments, geotubes)
  • Borrow site sand alternatives
  • Ship Shoal
  • Mississippi River
  • Barataria Basin ebb-tide shoals and relic
    distributaries
  • Three scales of analysis each alternative

16
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17
Alternatives for Investigation Diversion Strategy
  • Location on lower river
  • Converge LCA Study with prior study work
  • Miss. River Sediment, Nutrient, and Freshwater
    Redistribution Study (MRSNFR)
  • Barrier Shoreline Feasibility Study (BSFS)

18
Study StatusBarataria Basin Phase I
  • Data collection nearing completion
  • Early stage of planning plan formulation workshops

Barataria Basin Phase II
  • Early stage of initiating model development for
    existing conditions

19
Study Websitewww.coast2050.gov
20
Barataria Basin Study Strategies
Phase II Study
Phase I Study - current
Phase I Study - to be added
R2-6. Enrich Existing Diversions with Sediment
R2-19. Gap Spoil Banks/Plug Canals in Lower Bay
Marshes
R2-4. Divert Through Existing Locks R2-5.
Manage Outfall of Existing Diversions R2-25.
Maintain Shoreline Integrity
R2-1. Small River Diversion
R2-26. Dedicated Dredging
R2-24. Preserve Land Bridge
R2-3a. Provide Diversion Related Flood Protection
R2-10. Delta Building Diversion at Myrtle Grove
R2-8 Small Diversions
R2-2. Restore Natural Drainage Patterns
R2-3b. Remove Flood Waters from the Upper Basin
R2-11. Delta Building Diversion at Bastion Bay
R2-18. Parallel Conveyance Channel and Delta
Lobe
R2-9. Sediment Trap for Marsh Creation
R2-20. Wave Absorbers and Reef Zone (R2-1)
R2-16. Dedicated Dredging for Marsh Creation
along Hwy. 1
R2-17. Dedicated Dredging for Marsh Building in
Caminada Bay
R2-22. Restore/maintain Barrier Shoreline,
Port Fourchon to Sandy Point
R2-23. Extend Barrier Shoreline, Sandy Point
to Southwest Pass
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