Designing Coastal Community

Transcription

1 Designing Coastal Community Infrastructure for Climate Change Winthrop, Massachusetts May 23 rd, 2017 Public Meeting #2

2 Study Goal To identify and prioritize critical public infrastructure vulnerable to coastal flooding and explore adaptation measures to improve infrastructure resilience over a range of future conditions.

3 Meeting Agenda / Assessment Process Overview Identify What areas of Winthrop are at risk of coastal flooding? What public infrastructure is located in these areas? Prioritize How critical is this infrastructure and what is the likelihood that it will flood? Strategize How can Winthrop adapt to coastal flooding to help protect the critical public infrastructure in town?

4 Identify: Coastal Flood Risk

5 Probability of Coastal Flooding Present Belle Isle Marsh Winthrop Highlands Ingleside Park Lewis Lake Winthrop Beach Boston Harbor Fishermen s Bend Cottage Hill Point Shirley Yirrell Beach

6 Identify: Public Infrastructure

7 B Flood Areas C A D F E G A. Belle Isle Marsh B. Nahant Avenue C. Girdlestone Road D. Ingleside Park E. Lewis Lake / Winthrop Beach F. Fishermen s Bend G. Point Shirley Probability of Flooding 2030

8 13 12 Amended CI List public infrastructure points & corridors within likely coastal flooding areas

9 Prioritize: Public Infrastructure

10 Prioritize Risk = Criticality x Probability Criticality Score of 1 (not critical) to 5 (most critical) to rate the effect coastal flooding would have on: Area of Service Loss Public Safety / Emergency Services Social and Economic Activity Public Health & Environment

11 Prioritize Risk = Criticality x Probability Probability Weighted number to allow assets/facilities within present day flood areas a higher priority than those at risk in future years. Present day = 60% 2030 = 30% 2070 = 10%

12 Risk Score = Criticality x Probability % Probability of Flooding RANK CRITICAL INFRASTRUCTURE NAME CRITICALITY RISK Present TOTAL SCORE 1 Pico Sewer Pump Station Pleasant Court Sewer Pump Station Washington Street (town evacuation route) Main Street (town evacuation route) Pleasant Street (town evacuation route) Beach Fire Station Winthrop High School Pressure Reducing Valve Station (Bayview Ave) Pressure Reducing Valve Station (Underhill St) Shirley St (town evacuation/mwra truck route) Public Landing Pressure Reducing Valve Station (Revere Street) Revere St. Sewer Pump Station Belle Isle Bridge Power Substation (Argyle Street) Loring Rd. Boat Ramp

13 Strategize

14 Adaptation Types Site vs. Shoreline

15 Site Adaptation Types Site-specific installations can protect a single property or asset: Relocate Elevate Waterproofing Barriers Flood Control International EKO Flood USA

16 Pico Avenue Site Adaptations Potential adaptations for Sewer Pump Stations: Waterproofing Perimeter barriers SCADA (Supervisory control and data acquisition) System Pico Park Flood Control International Aquafence

17 Shoreline Adaptation Types Gray, Green & Hybrid installations may protect a linear corridor or larger flood area Salt Marsh & Dune Restoration Sea Wall Living Shoreline Bulkhead

18 1 2 3 Four Focus Areas for Shoreline Adaptations 1. Belle Isle Marsh 2. Ingleside Park 3. Lewis Lake / Winthrop Beach 4. Point Shirley 4

19 Focus Area 1: Belle Isle Marsh Pleasant Park Rd Amelia Ave Fairview St Flood Pathways Morton St

20 Shoreline Adaptation Measures for Main Street Potential Planted Berm Flood Pathways

21 Shoreline Adaptation Measures for Main Street Section A-A 1

22 Focus Area 2: Ingleside Park Flood Pathways

23 Adaptation Strategy for Pleasant Street Potential Barrier with Green Infrastructure Installation

24 Adaptation Strategy for Pleasant Street Section A-A 1

25 Focus Area 3: Lewis Lake Lewis Lake Flood Pathways

26 Adaptation Strategy at Washington Avenue Potential Adaptable Flood Barrier Lewis Lake Flood Area

27 Adaptation Strategy at Washington Avenue Section A-A 1

28 Focus Area 4: Point Shirley

29 Potential Beach Nourishment / Dune Creation at Yirrell Beach Shoreline Adaptation Measures for Shirley Street

30 Shoreline Adaptation Measures for Shirley Street Section A-A 1

31 Adaptation Types: Town-wide Approaches 1. Upsize stormwater pipes 2. Install flapper valves on outfalls 3. Repair / modify existing shoreline structures

32 Next Steps

33 Next Steps Programming level costs Regulatory requirements Policy strategies Financing mechanisms Final report

34 Designing Coastal Community Infrastructure for Climate Change Questions / Comments Winthrop, Massachusetts May 23, 2017