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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