BEACH AND INLET PROJECTS UPDATE

Transcription

1 BEACH AND INLET PROJECTS UPDATE

2 Topics Post-Matthew FEMA Emergency Dune Restoration Project Revised Permit Based on Updated Survey Adjust Design Due to Post-Storm Recovery/Erosion USACE Delta Project Expected Project Extents and Potential Timeline Turtle Habitat FEMA Restoration Project Expected Project Extents and Potential Path(s) Forward Potential Lockwoods Folly Projects SDI-5 / Ongoing Inlet Maintenance / AIWW Crossing Project Master Plan Beginning Phases and First Steps

3 POST-MATTHEW FEMA EMERGENCY DUNE RESTORATION PROJECT

4 Post-Matthew FEMA Emergency Dune Project Start Date November 20 th Completion Date March 2 nd Update Design Based on Most Current Survey Data Available Realign Dune Farther Landward Where Possible to Limit Losses to Extent Practicable Issues with Sand Color Necessitated Change Order Multiple Design Revisions Required to Keep Project in Budget and Within Available Volume for Borrow Pit

5 Post-Matthew FEMA Emergency Dune Project Typical Profile Meets Requirement for FEMA Reimbursement ~5-yr Surge Level

6 Post-Matthew FEMA Emergency Dune Project

7 Post-Matthew FEMA Emergency Dune Project

8 Post-Matthew FEMA Emergency Dune Project Dune Crest Width - 6 ft Constant Elevation Across Each Reach Vegetation of the Dune Limited to the Back Side and Crest Offshore Onshore Vegetation

9 Post-Matthew FEMA Emergency Dune Project

10 Post-Matthew FEMA Emergency Dune Project Project Budget Original FEMA Authorization of $ 2,669,028 (75% of Cost) State/Town Expected Contribution of $ 889,676 Total Project Expected Cost = $ 3,558,704 Revised FEMA Authorization of $ 3,957,700 (75% of Cost) State/Town Expected Contribution of $ 1,319,233 Total Project Expected Cost = $ 5,276,933 Total Project Expenditures Expected - $ 4,806,781 Additional Sifting and Sand Moving Work Expected Expected to Stay Within Budget

11 USACE DELTA PROJECT

12 USACE Delta Project Project Extents

13 Elevation Elevation (ft NAVD88) (ft NAVD88) USACE Delta Project Project Cross-Section ft 125 ft Post-Matthew Post-Matthew Profile Profile 85 ft 110 ft Pre- Project Pre- Project MHW MHW Station Station Post- Project Post- Project MHW MHW Beach Fill Beach Template Fill Berm Template Only Mean High Water Mean High Water Ocean Ocean Sta Berm 38.4 cy/ft Only ~40 cy/ft -18 Sta Distance to Baseline (ft)

14 USACE Delta Project Project Extents and Timeline USACE Is Showing a ~ ft Berm from Town Line to SE 58 th Street Base Project is from Town Line to SE 77 th (4,000 ) = 163,345 CY Delta Project is From SE 77 th to SE 58 th (6,000 ) = 251,526 CY Both Have ~ 40 cy/ft Placement Rate If Bids Come In Within Budget, Unit Rate = $11.93/CY Town Has Allotted Up to $3 Million for This Project No Bids Were Received on November 30 th, 2017 USACE Currently Planning to Readvertise This Month Plans Not Online As of March 12 If an Awardable Bid Is Received, Construction May Occur During Summer If Not, Project Should Be Rebid In Fall

15 FEMA TURTLE HABITAT PROJECT

16 FEMA Turtle Habitat Restoration Project Project Extents

17 FEMA Turtle Habitat Restoration Project

18 FEMA Turtle Habitat Restoration Project Project Extents FEMA Turtle Habitat USACE Delta Project

19 FEMA Turtle Habitat Restoration Project Project Budget FEMA Authorization of $ 6,026,365 (75% of Cost) Permitting State/Town Expected Contribution of $ 2,008,788 Total Project Expected Cost = $ 8,035,153 Project Volume = 364,033 cy Discussions with USACE and NCDCM to See If Can Piggyback Onto Wilmington Harbor Navigation Project Issues with Funding Source Is A Limiting Factor (Still In Discussion for Fall if Harbor Maintenance Project Delayed) Need to Look at Yellow Banks, Offshore Site, Inland Truck Haul Depending on Schedule

20 POTENTIAL LOCKWOODS FOLLY PROJECTS

21 Potential Lockwoods Folly Projects

22 Potential Lockwoods Folly Projects

23 Potential Lockwoods Folly Projects Town Is In Process of Acquiring Its Own Permit to Dredge Lockwoods Folly (SDI-5) Next Few Months Town Has Been in Discussions with USACE, County and Town of Holden Beach Concerning Upcoming Nearshore Placements Current Project Not Feasible Due to Limited Schedule for USACE Dredge Plant Town Has Asked that Next Quarterly Project Be Placed Near West End Hotspot Town Will Likely Have to Pay Additional Costs for Increased Travel Time Town Has Also Asked to Be Included In Discussions for USACE AIWW Crossing Project This Fall

24 MASTER PLAN BEGINNING PHASES AND FIRST STEPS

25 Master Plan Beginning Phases and Initial Steps Verify Sediment Need for Initial Project and Over Next 50 Years (2-3 Mcy for Initial Project / 1 Mcy Every 6 Years) USACE Delta and FEMA Turtle Habitat Project Can Hopefully Reduce Volume Need or Allow for Piggybacking Opportunity May Need to Build In Phases Begin Field Investigations Geotechnical Vibracoring for Sediment Compatibility Velocity Studies of Lockwoods Folly Inlet to Models to Develop Inlet Maintenance Plan

26 Master Plan Beginning Phases and Initial Steps Preliminary Offshore Sediment Resources Based on NCBIMP, USACE and NCGS Datasets Jaybird Shoals USGS R1a Central Reach (Holden Beach 2012) Wilmington Harbor ODMDS Frying Pan Shoals

27 Master Plan Beginning Phases and Initial Steps Preliminary Inshore Sediment Resources Based on NCBIMP, USACE and NCGS Datasets Yellow Banks AIWW Crossing Eastern Channel Lockwoods Folly Inlet

28 Master Plan Beginning Phases and Initial Steps Project Extents

29 Discussion Thank You!