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Home My WebLink AboutI. C. Coastal Storm Market Risk Management Update 2.11.2025CITY COUNCIL UPDATE February 11, 2025 Heather Lockwood, Project Manager Programs & Civil Works Branch Michelle Hamor, Chief Planning & Policy Branch CITY OF VIRGINIA BEACH COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY Photos from Virginia Beach Sea Level Wise Adaption Strategy Report COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH The map displays model outputs in 2089 with USACE high sea level change curve Study Purpose The purpose of the study is to investigate solutions to reduce potential damages and risk to human life, health, and safety caused by coastal storms in the City of Virginia Beach. Impacts from sea level change are expected to increase risk and vulnerability in the region.Managing coastal storm risk will improve the city’s resilience to the impacts of coastal storms and flooding. COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Potential Measures to Manage Risk STRUCTURAL MEASURES Physical structures that are designed to reduce the frequency of damaging levels of coastal storm inundation. Levees, floodwalls, and coastal storm surge barriers are examples of structural measures. Reduce flood damages without significantly altering the nature or extent of flooding. Structure elevation, floodproofing, relocation, and advanced warning systems are examples of nonstructural measures. NONSTRUCTURAL MEASURES Storm Surge Barriers Floodwalls Levees NATURE-BASED SOLUTIONS Engineered features designed to act in concordance with natural features to provide flood risk management. Living shorelines, beach/dune enhancement, and oyster reef restoration are examples of nature-based solutions Elevating residences Floodproofing Critical Infrastructure Living Shorelines with reef structures Wetland Restoration/ Enhancement COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Study Initiation Phase Feasibility Phase Preconstruction, Engineering, and Design (PED) Phase Construction Phase Operations & Maintenance Phase Civil Works Process We Are Here Feasibility Phase Process COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Feasibility Phase Process Notice of Intent in the Federal Register MILESTONE Date Alternatives Milestone November 2022 Notice of Intent to prepare an EIS Spring 2025 Tentatively Selected Plan Summer 2025 Public Release of Draft Report Fall 2025 Agency Decision Milestone Spring 2027 Final Report Submittal Fall 2027 Signed Chief’s Report Spring 2028 Study Duration: 5 Years 11 Months Alternatives Milestone Tentatively Selected Plan Agency Decision MilestoneRelease of Draft Report Final Report Transmittal Signed Chief’s Report We Are Here Decision &Product Milestones COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Cost Share: 50% Fed/50% Non-Fed (IEPR 100% Federally Funded) Spent Approximately $2.5M to date FEDERAL AND NON-FEDERAL SCHEDULE OF COSTS YEAR TOTAL N-FED WORK IN KIND*N-FED CASH FED IEPR (FED) FY22 $200,000 $0 $0 $200,000 FY23 $1,700,000 $0 $950,000 $750,000 FY24 $2,400,000 $0 $1,200,000 $1,200,000 FY25 $3,000,000 $0 $1,500,000 $1,500,000 FY26 $2,800,000 $0 $1,300,000 $1,300,000 $200,000 FY 27 $2,000,000 $0 $1,000,000 $1,000,000 FY 28 $1,400,000 $14,000 $686,000 $700,000 TOTAL $13,500,000 $14,000 $6,636,000 $6,650,000 $200,000 Study Costs COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Lynnhaven Inlet Measures 3-8 February 2025 Engagement 1 Structural Measure 2 •Includes a series of floodwalls, and several gate structures, including a gate proposed at the ‘Narrows’ where Broad Bay converges with Linkhorn Bay. Structural Measure 1 •Similar to proposed engineered defenses in the Sea Level Wise Adaptation Strategy. •Includes a surge barrier at Lynnhaven Inlet and dune fortification along the bay front. The alignment also includes a floodwall section along the western terminus. Structural Measure 3 •Similar to Structural Measure 1 but does not include a proposed dune/beach feature at JEB-Fort Story. Future Without Project Inundation 1% AEP (100yr) at year 2089 with High Sea Level Change Flood Source The flood source for the Lynnhaven Inlet Measures is the Chesapeake Bay. The flood source is denoted with white arrows on the inundation map. Flood Source COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Back Bay Measures 3-8 February 2025 Engagement Structural Measure 1 •Similar to proposed engineered defenses in the Sea Level Wise Adaptation Strategy. •Includes a series of floodwalls along the Sandbridge community and elevating Sandbridge Road. Structural Measure 2 •Includes evaluation of elevating Sandbridge Roadway and has two waterway gate crossings. •At this time, no structural measures are proposed or the Sandbridge community in Measure 2. A nonstructural plan would be implemented for the Sandbridge community. Future Without Project Inundation 1% AEP (100yr) at year 2089 with High Sea Level Change Flood Source The flood source for these measures is the Back Bay, and flooding propagates northward. The flood source is denoted with white arrows on the inundation map. Flood Source COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Elizabeth River Eastern Branch Important Note: Although three potential structural alignment locations have been identified to date, further coordination between the study team and the cities of Virginia Beach and Norfolk is needed. • Location 1 is the alignment presented in the City of Virginia Beach’s Sea Level Wise Adaptation Strategy (2020) • Location 2 alignment adjacent to S. Military Hwy • Location 3 alignment adjacent to I-64 • Preliminary locations are under consideration. Some alignments will continue to be included, and others will be screened out based upon further analysis and stakeholder/public feedback. 3-8 February 2025 Engagement Community/ Neighborhood Impacts Socially Vulnerable Populations Existing Infrastructure Norfolk CSRM Project Existing Environmental Resources Real Estate Requirements Industrial Waterway Uses Planning considerations for the Eastern Branch of the Elizabeth River: 1 3 2 COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Little Creek Measures Structural Measure 1 •Includes a surge barrier comprised of gate across Little Creek Inlet and associated floodwall and sand dune fortification along the bay front. This is similar to proposed engineered defenses in the Sea Level Wise Adaptation Strategy. •Norfolk CSRM Project currently includes a proposed storm surge barrier at Pretty Lake (future phase of the project). 3-8 February 2025 Engagement Structural Measure 2 •Includes the beach/dune feature only and does not include a storm surge barrier at Little Creek Inlet. Structural Measure 3 •Includes a floodwall outside of the boundaries of JEB-Little Creek along Northampton Blvd. Future Without Project Inundation 1% AEP (100yr) at year 2089 with High Sea Level Change Flood Source The flood source for the Little Creek Measures is the Chesapeake Bay. The flood source is denoted with white arrows on the inundation map. Flood Source COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Southern Rivers Measures 3-8 February 2025 Engagement Structural Measure 1 •Similar to proposed engineered defenses in the Sea Level Wise Adaptation Strategy. •Includes various reaches of elevated roadway, levee, and waterway gate closure crossings. Structural Measure 2 •Includes various reaches of elevated roadway, levee, and waterway gate closure crossings. This measure includes a gate closure at North Landing River Future Without Project Inundation 1% AEP (100yr) at year 2089 with High Sea Level Change Flood Source The flood source for the Southern Rivers Measures is the North Landing River and the Back Bay. The flood source is denoted with white arrows on the inundation map. Flood Source COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH West Neck Creek Bridge Measure 3-8 February 2025 Engagement •Alignment includes elevated roadway and gate adjacent to West Neck Creek bridge. There is a levee section at the northern terminus to complete the line of protection and mitigate against wrap around flooding for the 1% AEP. Future Without Project Inundation 1% AEP (100yr) at year 2089 with High Sea Level Change Flood Source The flood source for the West Neck Creek Measure is the North Landing River. The flood source is denoted with white arrows on the inundation map. Flood Source West Neck Creek Bridge facing west View North from the West Neck Creek Bridge COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Ocean Front and Rudee Inlet Measures 3-8 February 2025 Engagement Future Without Project Inundation 1% AEP (100yr) at year 2089 with High Sea Level Change Flood Source The flood source for the Ocean Front and Rudee Inlet is the Atlantic Ocean. The flood source is denoted with white arrows on the inundation map. Flood Source Structural Measure 1 •Ocean Front and Rudee Inlet Measure 1 are similar to proposed engineered defenses in the Sea Level Wise Adaptation Strategy. It includes a dune system along the entire ocean front and a surge barrier at Rudee Inlet. Structural Measure 2 •Ocean Front and Rudee Inlet Measure 2 includes a dune system along portions of the ocean front, a surge barrier at Rudee Inlet, and a floodwall section along NAS Oceana Dam Neck Annex. COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH •Vertical Team Alignment Memo APPROVED 10 December 2024 •Future Without Project (FWOP) – Targeted Agency Technical Review for economic models (G2CRM, LifeSim, Beachfx, HEC RAS) •ERDC Hydrodynamic Modeling (Tasks 1-2 out of 8) •ISTORM barrier workshop December 3-6, 2024 •Virtual Public meetings December 12 & 16, 2024 •Navy, Pilots, Coast Guard Barrier workshop January 21-22, 2025 •Structural Measures & Alternatives Screening January 21 & 23, 2025 •Interagency Meeting January 23, 2025 •In-Person Public Meetings February 3,5,6 and 8 •Nature Based Solutions Workshop February 5 •Navy Installation Site Visit February 7 Since the last City Council briefing in October 2024… COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH •Continued opportunities for public engagement (Civic league meetings, outreach events) •Future With Project (FWP) modeling including a compound flood sensitivity analysis •Refining Critical Infrastructure assumptions •Incorporating Nonstructural & Nature Based Solutions •ERDC Hydrodynamic Modeling Task 3 •Geotechnical Investigations •Geophysics survey starting in March with USACE sub-community of practice •Task Order – tracking for award in September 2025 •Barrier conceptual designs •Preparation of cost estimates “Not either /or,but and” (Structural vs.Natural) Ongoing efforts and next steps… COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACHUSACE TEAM LEAD INFORMATION Michelle Hamor Chief, Planning and Policy Branch Michelle.L.Hamor@usace.army.mil 757 -201 -7491 Shannon Kelly Engineering Chrissie Figueroa Planning Justine Woodward Environmental U.S. Army Corps of Engineers Norfolk District Team Leads Jennifer Spencer Economics Christina Parker Real Estate 3 Heather Lockwood Project Manager Heather.Lockwood@usace.army.mil 757 -264-2330 17 BACK-UP SLIDES COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Storm surge barriers reduce risk to people, structures and infrastructure located in the back bay and estuarine environment against flooding caused by storm surge and waves Storm surge barriers consist of a series of movable gates that stay open under normal conditions to let navigation and flow pass but are closed when storm surges are forecasted to exceed a specific water level. Storm surge barriers may have environmental impacts under normal conditions associated with reductions in water exchange between the ocean and bay/estuarine environment. Op en Close d 150 ft Horizontal Sector Gate Raise Boardwalk & Add Floodwall/Bulkhead Potential Bulkhead On Both Inlet Sides Federal Navigation Channel Rudee Inlet Seawall/Floodwall Dune Rudee Inlet Storm Surge Barrier Example of Existing Horizontal Sector Gate in New Bedford, MA COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Rising Sector Gate Open Position Rising Sector Gate Closed Position Example of Existing Rising Sector Gates at the Thames Barrier in London Potential Bulkhead On Both Inlet Sides Dune Seawall/Floodwall Federal Navigation Channel Potential Channel Realignment 200 ft Rising Sector Gate 250 ft Rising Sector Gate 250 ft Rising Sector Gate Approx. Location of Existing Bridge Piers Lynnhaven Inlet Storm Surge Barrier COASTAL STORM RISK MANAGEMENT FEASIBILITY STUDY CITY OF VIRGINIA BEACH Example of Existing Floating Sector Gate (Open) in the Netherlands Example of Existing Floating Sector Gate (Closed) in the Netherlands Example of Existing Horizontal Sector Gate (Open) in New Bedford, MA 460 ft Horizontal or Floating Sector Gate Dune Little Creek Inlet Storm Surge Barrier Seawall/Floodwall Federal Navigation Channel