W. Tobey Ritz MTA Metro-North Railroad, Chief Engineer Capital Engineering New York/New York

Transcription

1 What have we learned about future emergency preparedness from Irene and Sandy W. Tobey Ritz MTA Metro-North Railroad, Chief Engineer Capital Engineering New York/New York

2 Metro North Railroad Storm Surge Analysis

3 Storm Surge and Flooding Impacts Metro-North Railroad Operations Service Interruptions Equipment Loss Increased Maintenance Safety

4 Estimates of Sandy Impact 50% of Hudson Line Flooded Short- and Long-Term Damage to Essential Electrical and Electronic Systems 92 Switch Machines 30 Miles of Communications Cable 150 Relay Components and other Electronic Circuitry Sensitive components will continue to fail

5 Post Sandy Activities Immediate Action Hydrologic On-Call Collect topographic data and develop Digital Elevation Maps (DEM) of Metro- North System Survey Critical Infrastructure Collect Flood Marks Replicate Sandy with Estuarine Coastal Ocean Model (ECOM)

6 Collect Topographic Data Hudson Shoreline, Long Island Sound (NY) NYSDEC Coastal LIDAR Flown Nov 2011-April meter Horizontal resolution, 15 cm (6 in) Vertical Accuracy Long Island Sound (CT) UCON Center for Land Use Education and Research (CLEAR) Collected in ft Horizontal Resolution, 1 ft vertical accuracy

7 Survey Critical Infrastructure & Collect Flood Marks Capitol Program enlisted HDR to collect critical elevation data using high accuracy GPS, coordinating with Metro-North signals and power departments to focus efforts Trimble RTK GPS (cm accuracy) 5 Survey days focusing on areas impacted by flood waters Over 200 measurements collected

8 Survey Critical Infrastructure & Collect Flood Marks

9 Replicate Sandy with ECOM ECOM: Estuarine Coastal Ocean Model 3D time dependent model Developed in 1987 Continually updated and refined by HDR HydroQual Widely used to assess surge impacts

10 ECOM MODEL

11 ECOM MODEL RESULTS GCT Rail Miles Poughkeepsie

12 ECOM MODEL RESULTS GCT Rail Miles New Haven

13 Products for Metro North Railroad Record of Sandy Impacts and Flood Marks Map Book of Track Inundation Levels Digital Inundation Maps Critical Infrastructure Database Recommended Design Flood Elevations

14 Products for Metro-North s Future Record of Sandy Impacts (GIS Data)

15 Products for Metro-North s Future Map Book Guide Real-time Emergency Response Plan Mitigation Activities Plan Future Projects

16 Products for Metro-North s Future Digital Map Pan and Zoom to areas of interest

17 Products for Metro-North s Future Database of Infrastructure Critical Elevations Critical Facility Mile Point (mile) Critical Elevation (NAVD88 ft) Sandy High Water Mark (NAVD88 ft) Marble Hill Location 9.8 box Spuyten Duyvil CP Spuyten Duyvil CP Riverdale MP 13.1 box Tarrytown Substation A Tarrytown Tarrytown trailer Harmon Yard CP Harmon Yard Substation A Manitou CP Cold Spring Cutbox Cold Spring Cutbox Cold Spring CP New Ham. SB New Ham. SB Poughkeepsie SB Mott Haven CP High Bridge CP Harmon CP Stamford Shop NA Bridgeport Shop NA New Haven Building 1B NA Critical Elevation: Water surface elevation which could impact railroad facility

18 Preliminary Recommendations / Guidelines Location Hudson River to Just North of Harmon Yard ( HUD CP 1 34) Hudson River Harmon Yard to Westchester County line ( HUD CP 34 45) Hudson River from Westchester County line to Poughkeepsie (HUD CP 45 75) Long Island Sound South of New Rochelle (CP ) Long Island Sound North of New Rochelle to CT State line CP Long Island Sound North of CT state line to Fairfield CP Long Island Sound North of Fairfield to New Haven CP Current BFE (NAVD88 ft.) 1% ABFE (NAVD88 ft.) Sea Level Rise Range (2080s) ft. Sea Level Rise Accommodation ft. Freeboard per Sate Building Code *Recommended elevation pending publication of ABFE s or updated FEMA FIS Design Flood Elevation (DFE) (NAVD88 ft.) to to to to to * 1 to * 1 to

19 Mitigation Alternatives Raise Critical Infrastructure Flood Proofing Exterior Hardening Dry Interior Hardening - Wet Construct new facilities to recommended DFE

20 Raising Existing Infrastructure Southwest Louisiana Electric Membership Corporation (SLEMCO) rebuilt three substations swamped by Hurricanes Rita and Ike The substations were raised two feet above Federal Emergency Management Agency guidelines Issues o o o Access Cost Location

21 Exterior Hardening Dry Flood Proofing Building Keep water out Substation A13 Riverdale

22 Exterior Hardening Floodwalls Site

23 Harmon Yard Floodwall Concept Harmon Yard Flooding Abated by Flood wall Flood Wall Railroad Closure Structure

24 Exterior Hardening Floodwalls Site

25 Exterior Hardening Floodwalls Railroad Closure

26 Recommended Next Steps Storm Surge Response Efforts Full Inventory of Assets at Risk Risk Assessment and Cost Benefit Analysis of Options Assess opportunities to raise / flood proof facilities in vulnerable areas Prioritize and Implement Mitigation Use DFE or Cost Benefit Analysis when replacing or building new facilities

27 Recommended Adaptation Steps 1. Identify current & future climate hazards 8. Monitor & Reassess 2. Conduct Inventory of Infrastructure & Assets 7. Implement Adaptation Plans 3. Characterize Risk of CC on Infrastructure 6. Link Strategies to Capital & Rehab Cycles 4. Develop Initial Adaptation Strategies Klaus H. Jacob Presentation to NYSDOT on Adaption Challenges Oct Identify Opportunities for Coordination

28 Recommended Next Steps Additional Hazard Mitigation Efforts Grand Central Terminal Assessment Power Needs Assessment Based on Sandy Experience (i.e. generators at stations) Monitoring Systems Electronic at Critical Locations Staff Gages to show relative depths of flooding Assess Rainfall Runoff Vulnerabilities Mott Haven Yard, Brewster Yard Assess Shoreline stabilization needs and take advantage of soft hardening where feasible

29 Sandy and Irene Preparedness Lessons learned General Principles Just because it has never happened before doesn t mean it can't or won't happen. Need to Imagine worst case and what if scenarios beforehand and plan. Plan and prepare mitigation measures in advance and have flexible adaptable plans in place for emergency responses and repairs. Real time decision making and communication through the event is crucial and a team/process must be in place beforehand. Assess performance in drills and actual emergencies and learn from experience. Evaluate measures and take steps to build system resiliency and redundancy. Understand and inventory complete infrastructure and assess all current and future vulnerabilities.