cwppra terracing and marsh creation south of big mar project ba 24
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CWPPRA Terracing and Marsh Creation South of Big Mar Project (BA-24). Project Kickoff Meeting April 17, 2013. Meeting Goals. Review project background Discuss project features and potential changes or additional features to investigate

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cwppra terracing and marsh creation south of big mar project ba 24
CWPPRA Terracing and Marsh Creation South of Big Mar Project(BA-24)

Project Kickoff Meeting

April 17, 2013

meeting goals
Meeting Goals
  • Review project background
  • Discuss project features and potential changes or additional features to investigate
  • Discuss engineering and design tasks necessary to reach 30% design milestone
  • Discuss other Phase 1 tasks – landrights, permits, NEPA
  • Develop a schedule for Phase 1 tasks to reach 30% design
background
Background
  • Developed to restore the marsh platform scoured by Hurricane Katrina
  • Will work in concert with the Lake Lery Shoreline Protection Project (BS-16) to reinforce the historic Lake Lery Shoreline
  • Terraces will reduce wave fetch in the large open water areas and promote conditions conducive to growth of marsh vegetation and submerged aquatic vegetation.
  • Will also benefit from freshwater, sediments, and nutrients provided by the Caernarvon Freshwater Diversion Project.
project features
Project Features

Marsh Creation

335 acres of marsh created and restored

  • Terracing
  • ~65,000 linear feet of terraces (50 acres)
project features cont
Project Features(Cont.)
  • Marsh Creation
  • Approximately 2.5 M cubic yards of material would be dredged from a borrow site proposed in Lake Lery
  • Retention levees gapped/degraded to support estuarine fisheries access and to achieve a functional marsh
  • Pipeline layout initial design:
project features cont1
Project Features(Cont.)

Terraces

  • Terraces LF was not based on the standard >>> 250 ft apart, 70.2 LF per acre
    • which would result in 67,883 LF comprising 967 acres of terraces
  • GIS effort was conducted that placed the terraces 300-400 feet apart with 65,000 LF of terraces in approximately 1,000 acres.

Terraces based on:

xxx LF/acre and xxx\' spacing

benefits costs
Benefits/Costs
  • Benefits: 307 net acres of intermediate marsh over 20 years.
  • Fully funded cost = $23,843,953
  • Phase 1 cost = $2,258,696
  • Approved for Phase 1 funding by the CWPPRA Task Force on January 24, 2013.
design considerations
Design Considerations
  • Configuration of terracing
  • Borrow Area/Dredge pipe route
  • Dewater locations
  • Gapping vs. degrading
  • Tidal creeks
  • Identify additional /alternative areas that would benefit from terraces or marsh creation
engineering design and other phase 1 tasks
Engineering & Design and other Phase 1 Tasks
  • Surveys
  • Wave analysis – same borrow area
  • Geotechnical Investigation
  • Gage Installation
  • Landrights
  • NEPA
  • Permit Application
  • Cultural Resources
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