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ACOE Reformulation study for Jamaica Bay


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Army Corps of Engineers Reformulation study for Jamaica Bay

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ACOE Reformulation study for Jamaica Bay

  1. 1. US Army Corps of Engineers BUILDING STRONG® Atlantic Coast of New York East Rockaway Inlet to Rockaway Inlet and Jamaica Bay, NY Reformulation Jamaica Bay Overview
  2. 2. BUILDING STRONG® Authorized Study Area 2
  3. 3. BUILDING STRONG® Scale of the Problem Blue illustrates current 1% annual chance of flooding Purple illustrates 1.3 feet of RSLC in 2070, (mid-range SLC) added to the 1% Annual chance of flooding 3
  5. 5. BUILDING STRONG® 1965 Authorized Project Features
  6. 6. BUILDING STRONG® June 21, 1965 “…the Chief of Engineers has recommended that field studies and hydraulic model investigations are to be conducted in connection with the final design of the project to determine the specific effects of the proposed hurricane barrier on water quality, fish, and wildlife, and currents in Jamaica Bay…” 6
  7. 7. BUILDING STRONG® Reformulation Study Recommendation of the Federal Project is based on benefit/cost ratio Primary purpose for P.L. 113-2 is the reduction in future coastal flooding damages 7
  8. 8. BUILDING STRONG® Reduce vulnerability to storm surge impacts Reduce future flood risk in ways that will support the long- term sustainability of the coastal ecosystem and communities Reduce the economic costs and risks associated with large- scale flood and storm events Improve community resiliency, including infrastructure and service recovery from storm effects Enhance natural storm surge buffers and improve ecosystem resiliency Other Opportunities 8
  9. 9. BUILDING STRONG® Constraints  Do not negatively impact ongoing recovery, ecosystem restoration, and risk management efforts by others  Do not negatively impact navigation access through Rockaway Inlet  Do not induce flooding in areas not currently vulnerable to flooding and do not induce additional flooding in flood-prone areas  Do not reduce community access and egress during emergencies  Do not impact operations at John F. Kennedy International Airport  Do not negatively affect plants, animals, or critical habitat of species that are listed under the Federal on NYS Endangered Species Act
  10. 10. BUILDING STRONG®10
  11. 11. BUILDING STRONG® Jamaica Bay Measures Nonstructural Acquisition Managed Retreat Floodplain zoning Floodproofing/raising Flood warning system Structural Hurricane barrier Local Tide Gates Levee Floodwall Bulkhead/Seawall Breakwater Natural or Nature Based Living shoreline Coastal wetland Maritime and coastal forest Reef Dune and Beach Swale/Channel Other Bay shallowing Stormwater improvement Wastewater treatment Park access and recreation Evacuation routes 11
  12. 12. BUILDING STRONG® Measure Screening 12 Blue=Effective Green=Effective only for high frequency events
  13. 13. BUILDING STRONG®13
  14. 14. BUILDING STRONG®14
  15. 15. BUILDING STRONG®15
  18. 18. BUILDING STRONG®18 Table 27: Percentage of Existing Tidal Amplitude Opening Width Plan C-1 Plan C-2 Plan C-3 1,000 feet 58% 73% 58% 2,000 feet 91% 90% 70% 3,000 feet N/A 93% 79% 4,000 feet N/A 95% 81% 5,000 feet N/A N/A 90% Note: N/A indicates that the opening width is not feasible for this alignment
  19. 19. BUILDING STRONG® Structural Alternative Plan Evaluation Jamaica Bay Alternatives Preliminary Average Annual Net Benefits (AAEQ) Plan Name Total Annual Cost Benefits Net Benefits BCR Barrier C-1b $148,012,000 $265,833,000 $117,821,000 1.80 Barrier C-2b $118,669,000 $265,833,000 $147,164,000 2.24 Barrier C-2c $141,900,000 $265,833,000 $123,933,000 1.87 Barrier C-2d $165,131,000 $265,833,000 $100,702,000 1.61 Barrier C-3e $214,430,000 $265,833,000 $51,403,000 1.24 Head of Bay $36,550,000 $71,036,000 $34,486,000 1.94 Rock Back Bay $18,809,000 $67,896,000 $49,087,000 3.61 BC Breakwater $45,124,000 $13,390,000 ($31,734,000) 0.30 Jam Bay NW $101,986,000 $113,511,000 $11,545,000 1.11 Note: EADs and AAEQ costs calculated at FY14 price levels, 3.5% discount rate, and 50-year period of analysis
  20. 20. BUILDING STRONG® Jamaica Bay Alternatives  No Action Alternative  Non-Structural Alternative (can be mixed with other Alts)  Rockaway Inlet Hurricane Barrier ► Provides Benefits to all Economic Reaches  Jamaica Bay Perimeter Walls w/ Living Shorelines where appropriate (Perimeter Plan) ► Individual Plan Developed for each Economic Reach ► Negative BCR for Broad Channel, and not applicable for JFK area 20
  21. 21. BUILDING STRONG®21
  22. 22. BUILDING STRONG® Preliminary Focused Array Comparison (without Real Estate or Mitigation costs) Plan Name Total Costs Annualized Costs Annualized Benefits BCR “Best” Inlet Barrier $2,743,300,000 $118,669,000 $265,833,000 2.24 Head of Bay $834,250,000 $36,550,000 $71,036,000 1.94 Rockaway Back Bay $313,168,000 $18,809,000 $67,896,000 3.61 NW Jam Bay $2,300,156,500 $101,966,087 $113,511,000 1.11 Perimeter Total $3,447,574,500 $157,325,087 $252,443,000 1.60 22
  23. 23. BUILDING STRONG® Choosing A Path Forward  Further develop Jamaica Bay alternatives, including operational considerations (O&M can be expensive)  Estimate real estate and hazardous waste costs  Integrate ocean and bay alternatives  Define tie in features  Refine hydrodynamic modeling of Jamaica Bay  Improve quantification of environmental effects (WQ & habitats)  Collaboration with regulatory agencies to inform environmental thresholds, prioritize analysis  Detail and broaden analysis of plan benefits  Emphasize natural and nature based features and resiliency 23