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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. 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)

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  1. CWPPRA Terracing and Marsh Creation South of Big Mar Project(BA-24) Project Kickoff Meeting April 17, 2013

  2. 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

  3. 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.

  4. Address other projects in the area

  5. Project Features Marsh Creation 335 acres of marsh created and restored • Terracing • ~65,000 linear feet of terraces (50 acres)

  6. 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:

  7. 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

  8. 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.

  9. 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

  10. CRMS Locations

  11. Engineering & Design and other Phase 1 Tasks • Surveys • Wave analysis – same borrow area • Geotechnical Investigation • Gage Installation • Landrights • NEPA • Permit Application • Cultural Resources

  12. Discussion

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