AL Aquatic ecosystem restoration by zlr11756

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									          ALABAMA SECTION 204
AQUATIC ECOSYSTEM RESTORATION PROJECTS




                  Gulf of Mexico Alliance
      Regional Restoration Coordination Team Workshop
                      March 6-9, 2007
        Mobile District, U.S. Army Corps of Engineers
         Section 204 Authority Overview
• Authority to restore, protect and create aquatic and wetland
  habitats in connection with construction or maintenance
  dredging of an authorized project
• Water Resources Development Act (WRDA) of 1992
• Benefits public interest and cost effective
• Non-Federal sponsor required
• Cost share program
   • 75% Federal
   • 25% Non-Federal
      • Cash contribution
      • Lands credits
Section 204 Sites
            Partnerships and Stakeholders
• Alabama Department of Conservation and Natural Resources
•   Mobile Bay National Estuary Program
•   Mississippi - Alabama Sea Grant Consortium
•   Dauphin Island Sea Lab
•   U.S. Fish and Wildlife Service, Daphne
•   U.S. National Marine Fisheries Service
•   City of Mobile
•   University of South Alabama
Helen Wood Park
                   Helen Wood Park
Problem The loss of more 10 acres of tidal marsh within
the limits of the proposed project since 1955
Causes
 •   Shoreline erosion at a rate of 1 to 2.5 feet/year
 •   Coastal development
 •   Aquatic nuisance species

                                                     Common Reed &
                                                     Popcorn Trees



     Bulkhead
                   Helen Wood Park
Restoration Solutions




                                         sh
                                       ar
                                      M
                                      d
                                    te
                                  an
                                Pl
                                              Breakwater




         New Parking Area   Boardwalk &
                            Gazebo
                 Helen Wood Park
Restoration Solutions
• Current Improvements Underway:
    • Control of nonnative vegetation
    • Replacement of asphalt paving with permeable material
    • Safety lighting and benches
    • Boardwalk on a perimeter of the parking area
    • Gazebo
Issues:
  Lack of suitable fill material
  Submerged Aquatic Vegetation
Dauphin Island Parkway




                      Heron Bay Bridge




                Dauphin Island Bridge
                Dauphin Island Parkway

Problems The loss of more 12
acres of subtital and intertidal
vegetation since the 1950s
Causes
•   Historic shoreline erosion at
    an estimated rate of 2.0 ft/yr
    (1955-1985)
•   Coastal development
             Dauphin Island Parkway
Restoration Solutions
• Beneficial use of material from the Tenn Tom Navigation
  Channel to achieve suitable elevation for the establishment of
  tidal marsh vegetation
• Planting of 8 to 10 acres of emergent marsh vegetation
• Placement of more than 2 acres suitable oyster substrate
• Construction of a 2,600 ft segmented offshore breakwater to
  protect the newly planted marsh
 Issues:
   Lack of cost effective source of suitable material
Isle Aux Herbes
                     Isle Aux Herbes
Objectives
•   Retard shoreline erosion and restore tidal wetlands
•   Increase nesting habitat for colonial and migratory birds
•   Increase suitable oyster habitat
•   Build partnerships and share resources as to better meet
    the above objectives
                      Isle Aux Herbes
 Problem
The loss of more 87 acres of tidal marsh
on Isle Aux Herbes since
1955 (>10% of the island)
Causes:
•   Shoreline erosion at a rate of
    3 to 6 ft/yr
Isle Aux Herbes
                    Isle Aux Herbes

• Authority:
   – Section 204 of the Continuing Authority Program (CAP)

• Current Status:
     Preliminary Policy Report (PPR) undergoing policy compliance
     review at South Atlantic Division.

• What’s Next:
   – Initiate Feasibility Phase ($100K {initially 100% Fed}, to be cost
     shared during construction).
                   Isle Aux Herbes
Restoration Solutions
• Construction of an offshore breakwater to protect existing
  and newly planted wetland areas
• Confined placement of fined grained beneficial use
  material from the Bayou La Batre Channel to:
   • Restore historic marsh area (~10 acres)
   • Provide suitable relief for bird nesting habitat
• Creation of fringing hard bottom (oyster reef)
• Creation of Mississippi Diamondback terrapin nesting habitat

              ALL THIS IS ONE PROJECT!
                 Isle Aux Herbes
Restoration Solutions
     A

                                       A




                                       B
     C


                                   C
                 Isle Aux Herbes
Restoration Solutions



         Insert Plan View
              204 Restoration Projects
Benefits of these 204 Projects to Alabama
• Increased Fish, Wildlife and Plant Habitat
• Natural Water Quality Improvements
• Shoreline Erosion Protection
• Increase in Recreation, Education, Research Opportunities
• Opportunities to Share Resources and Build Partnerships
  for the Benefit of Aquatic Ecosystems
Questions




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