Goals and Strategies Goals Long-term Beach and Shoreline Management Program Qualify for and Maintain Static-line Exception Qualify for and Maintain FEMA Engineered Beach Lockwoods Folly Inlet Management Plan Davis Creek Area Enhancement Plan Strategies Develop Cost and Time Efficiencies by: Collaborate with USACE on Cape Fear Inlet Management SMP Utilize Available Data from the USACE BCB 50-yr Project Partner with Town of Holden Beach on joint Lockwoods Folly Inlet Management Innovative Permitting Approaches
Task 1 - Review Existing Data and Identify Field Data Collection Needs Use existing USACE and Town data to the extent possible (USACE, Cleary, etc.) Define representative reaches based on available data (subject to change) Identify data gaps for additional field work needed (topo/bathy surveys, geotechnical data) and likely permitting approaches Task 2 Field Investigations Topo/bathy surveys of representative profiles needed (~40 profiles) Preliminary sediment sampling of native beach also to be completed Above will provide general morphologic understanding of island, basis for limited modeling and compatibility assessment
Elevation (ft NAVD88) Project Scope of Work 25 20 Profile Volume Analysis-Profile Calculation Lenses Foredune (Landward Most Dune Crest) 15 10 Subaerial Beach (Top of Dune to MHW=+1.1 ft NAVD88) 5 0-5 -10-15 -20-25 -30 Recreational Beach (MHW to -5 ft NAVD88) Offshore (-20 ft NAVD88 to -30 ft NAVD88) Outer Bar (-5 ft NAVD88 to -12 ft NAVD88) Offshore (-12 ft NAVD88 to -20 ft NAVD88) MHW (+1.1 ft NAVD88) Wading Depth (-5ft NAVD88) Outer Bar (-12ft NAVD88) -20 ft NAVD88-30 ft NAVD88-35 -40 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 2,800 3,000 Distance from Baseline (ft)
Task 3 Coastal Engineering/Geology and Planning Evaluation Analytical analysis to develop preliminary estimates of sand need Build on USACE vulnerability analysis in the GRR and use DCM shoreline and USACE profile change data to develop estimates of sand need Sand source assessment Build on USACE GRR work (including Yellow Banks, inlet and offshore locations) Reassess the potential use of multiple sources Leverage beneficial use as possible (Eastern Channel, Lockwoods Folly Inlet) and complete analytical assessments of these options (increased flushing, water quality improvement, improved navigation) with expanded/optimal permitted dimensions Storm protection assessment Complete SBEACH modeling of representative sections to determine level of protection provided and likely templates needed to provide additional storm protection Short-term and long-term strategies will be developed as well as resulting funding needs/potential funding sources Incorporate static line exception and FEMA engineered beach criteria
Volume Change (cy) Task 3 Coastal Engineering/Geology and Planning Evaluation Volumetric Change February 2005 to December 2009 10000 5000 0 300 290 280 270 260 250 240 230 220 210 200 190 180 170 160 150 140 130 120 110-5000 -10000-15000 -20000-25000 Station -30000 Total Above -15 ft NGVD Above - 2 ft NGVD
Elevation (ft NAVD88) Project Scope of Work Task 3 Coastal Engineering/Geology and Planning Evaluation 25 20 Profile Volume Analysis-Profile Calculation Lenses Foredune (Landward Most Dune Crest) 15 10 Subaerial Beach (Top of Dune to MHW=+1.1 ft NAVD88) 5 0-5 -10-15 -20-25 -30 Recreational Beach (MHW to -5 ft NAVD88) Offshore (-20 ft NAVD88 to -30 ft NAVD88) Outer Bar (-5 ft NAVD88 to -12 ft NAVD88) Offshore (-12 ft NAVD88 to -20 ft NAVD88) MHW (+1.1 ft NAVD88) Wading Depth (-5ft NAVD88) Outer Bar (-12ft NAVD88) -20 ft NAVD88-30 ft NAVD88-35 -40 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200 2,400 2,600 2,800 3,000 Distance from Baseline (ft)
Task 3 Coastal Engineering/Geology and Planning Evaluation
Task 3 Coastal Engineering/Geology and Planning Evaluation 50-yr
Task 3 Coastal Engineering/Geology and Planning Evaluation ` Reach Length (ft) 50-yr -12 ft Trigger (cy) 25-yr -12 ft Trigger (cy) Adjusted 25- yr -12 ft Trigger (cy) Preliminary FEMA -12 ft Trigger (cy) -12 ft 2011 Volume (cy) Bogue Inlet (1-8) 7,432 238 103 238 389 235 Emerald Isle West - West (9-11) 4,056 282 230 230 277 Emerald Isle West - Central (12-22) 14,283 319 272 272 295 266 Emerald Isle West - East (23-25) 4,005 323 242 242 303 Emerald Isle Central - West (26-32) 10,428 237 213 213 292 211 Emerald Isle Central - East (33-36) 5,374 277 207 207 262 Emerald Isle East - West (37-44) 8,814 268 214 214 242 221 Emerald Isle East - East (45-48) 4,406 299 235 235 264 Indian Beach/Salter Path - West (49-52) 5,275 243 216 216 263 224 Indian Beach/Salter Path - East (53-58) 7,575 241 229 229 298 Pine Knoll Shores - West (59-65) 9,063 235 196 196 253 Pine Knoll Shores - East - West (66-70) 6,564 271 222 222 215 240 Pine Knoll Shores East - East (71-76) 8,251 276 230 230 262 Atlantic Beach - West (77-81) 5,388 269 225 225 281 Atlantic Beach - Central (82-89, 91-96) 13,771 368 256 256 291 243 Atlantic Beach - Circle (90) 1,006 408 364 364 330 Atlantic Beach - East (97-102) 6,011 304 209 209 384 TOTAL 121,702 AVERAGE 286 227 235 232 290 Weighted
Profile Volume Above -12 ft (cy/ft) Project Scope of Work Task 3 Coastal Engineering/Geology and Planning Evaluation 400 395 390 385 380 375 370 365 360 355 350 345 340 335 330 325 320 315 310 305 300 295 290 285 280 275 270 265 260 255 250 245 240 235 230 225 220 215 210 205 200 195 190 185 180 175 170 165 160 155 150 West Profile Volume Above -12 ft NAVD - EI East EI East - West EI East - East 37 38 39 40 41 42 43 44 45 46 47 48 Transect East 1999 2000 2003 2004 2005 2006 2007 2008 2009 2010 2011 Post-Irene 2012
Task 3 Coastal Engineering/Geology and Planning Evaluation
Task 3 Coastal Engineering/Geology and Planning Evaluation Environmental planning and permitting evaluation Agency meetings Review of existing data and identify data gaps for future data collection Identify permitting options (USACE GP291, EA, Supplemental EIS to GRR) Assess potential regulatory/mitigation/monitoring requirements Environmental planning and permitting evaluation Draft and final feasibility report NEPA SEPA
Task 4 Davis Canal Management Review existing surveys and prior investigations Identify additional data collection efforts needed for design and permitting Bathymetric surveys, water quality and other environmental data Develop conceptual dredging plan and potential funding options Develop permitting path in conjunction with Task 3 Review original permit and investigate USACE GP291 option Assess potential variance for dredging in Primary Nursery Area Investigate/Document historical navigation use Task 5 Project Management Town/Regulatory Coordination, Four (4) Meetings Additional Services Under Separate Authorization Represent Town of Oak Island in USACE SMP, USACE GRR and meetings concerning Lockwoods Folly Inlet Management
Project Fee Task 1 Review Data/Identify Data Collection Needs - $12,960 Task 2 Field Investigations - $18,220 Task 3 Coastal Engineering/Environmental Evaluation - $98,230 Task 4 Davis Canal Management - $6,960 Task 5 Project Management - $12,500 Incidentals $1,030 Additional Services Under Separate Authorization TBD TOTAL PROJECT - $149,900
Project Schedule Complete by End of 2014/Beginning of 2015 6-7 Months After Receipt of Available Data from USACE TASK APR MAY JUN JUL AUG SEP OCT NOV DEC JAN 1. Review Data/Identify Data Collection Needs Submit Data Request to USACE and Receive Data Data Collection/Review 2. Field Investigations Topo/Bathy Representative Profile Surveys Sediment Sampling and Reporting 3. Coastal Engineering Environmental Evaluation Analytical Analyses Sand Source Assessment Storm Protection Assessment and Modeling Environmental Planning and Permitting Assessment Draft and Final Report 4. Davis Canal Management Engineering Assessment and Plan Development Environmental Assessment and Planning 5. Project Management Client Coordination Meetings 2014
Current Scope Allows for Tiered Approach A. Complete a Feasibility Level Study to Determine Estimates of Project Needs and Costs ( 65% Answer ) 1) Beach Protection and Shoreline Needs 2) Lockwoods Folly Inlet Management 3) Davis Creek Enhancement 4) Determine if Feasible to Move Forward with a Small Investment B. If Town Desires, Move to Next Steps with a Detailed Study and Documentation Needed to Gain Permit Approval 65% Design Multiple Phased Approach for each Plan Board review and approve next steps Board review and approve next steps Master Plan 100% Design Implement Individual Projects Permit Approvals Plans and Specs Implement Construction