Infrastructure Resiliency Planning & Strategy at the Municipal Level. Adapt, Thrive, and Survive Climate Impacts

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1 welcome

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3 Infrastructure Resiliency Planning & Strategy at the Municipal Level Adapt, Thrive, and Survive Climate Impacts

4 Who we are Since 1899 Over 500 professionals 19 Office Locations on East Coast Three companies

5 Proven Industry Leader Top 50 Trenchless Design Firm in US (Rank #18)* Top 200 Design Firm in US (Rank #186)** Top 200 Environmental Engineering Firm in US (Rank #117)** Top 500 Design Firm in US** *According to Trenchless Technology **According to the Engineering News Record

6 Weston & Sampson Services Water Wastewater MEP/SCADA Stormwater Infrastructure Resiliency Architecture Landscape Architecture Information Technology/GIS Transportation Solid Waste

7 Weston & Sampson Services Renewable Energy Hazardous Waste Services Structural Engineering Geotechnical Engineering, Dams Public Works Facilities Surveying Environmental Science & Permitting Operation & Maintenance Services Construction

8 CMR & SERVICES Operation & Maintenance Water & Sewer System Maintenance Emergency Repairs (24-7) Cross Connection Control & Backflow Prevention Treatment Plant & System Operations Design/Build Construction

9 Recent Resiliency & Flooding Projects Church Creek Drainage Project Charleston, SC City of Boston Climate Resilience Design Standards Boston, MA MBTA Blueline (Aquarium to Maverick Stations) Flood Vulnerability Assessment Boston, MA DCR Draw Seven Park Somerville, MA DCAMM State-wide Resiliency Master Plan, Massachusetts Coastal Vulnerability Assessment Lynn Economic Development & Industrial Corporation Lynn, MA LoPresti Park Engineering and Design Services East Boston, MA Chelsea Creek Wetland Restoration/Habitat Conservation Chelsea, MA Chelsea Flood Resiliency Improvements Chelsea, MA

10 Increase tidal and nuisance flooding Sea Level Rise Global Sea Level Rise - Local Storm surge Extreme weather events Slow moving storms Increased volume of precipitation More frequent events

11 Resiliency Process PHASE 1 CLIMATE SCENARIO SELECTION TASK 1 Map climate conditions under future conditions TASK 2 Identify critical assets located in vulnerable areas PHASE 2 VULNERABILITY AND RISK ANALYSIS TASK 3 Identify the tipping point that would damage each critical asset TASK 4 Evaluate risk given probability of climate scenario and consequence PHASE 3 ADAPTATION STRATEGIES TASK 5 Identify and select adaptation strategies using C.E.F.T.A.C. analysis TASK 6 Implement adaptation and preparedness plan and monitor progress

12 PHASE 1 CLIMATE SCENARIO SELECTION Synthesis of available relevant technical analyses and reports Coastal Geomorphology Watershed Characteristics Asset Locations and Information Compilation of GIS data Development of Study Scenarios Preliminary review of relevant regulations

13 Climate Scenarios Time Horizon Selection Most Data Available for 2030 and 2070 Accommodate Planning Horizon with development 25 years, 50 years

14 Existing Sea Level

15 1 ft. Sea Level Rise

16 2 ft. Sea Level Rise

17 3 ft. Sea Level Rise

18 Bathtub versus dynamic model Storm events striking an area can result in significantly different impacts timing of the storm with the tide cycle storm track radius to maximum wind of a tropical storm amount of precipitation, etc. Data for design Probability of flooding (annual exceedance) Depth of Flooding Flood pathways Residence times Wind Waves Percent probability exceedance over all time horizons Source: The Woods Hole Group. Kirk Bosma: CLIMATE CHANGE PRIORITIZATION, EcoSeptember 2016

19 Flood Pathways & Residence Times

20 Precipitation and Inland Flooding

21 PHASE 2 VULNERABILITY AND RISK ANALYSIS RISK RANKING INFRASTRUCTURE & PROPERTY CLIMATE HAZARDS CRITICAL ASSETS

22 Local Sea Level Rise January 17, 2017 Climate Change Adaptation and Uncertainty 22

23 Risk Analysis Site Specific Identify Site Exposure and Scenarios CLIMATE CHANGE SCENARIOS P(Event) Sea Level Rise & Storm Surge Inland Precipitation Heat Mitigate Risk Vulnerable Facility Elements SITE/FACILITY CHARACTERIZATION P(Damages Event) = Adaptive Capacity * Sensitivity Review of Existing Information Inspection Interview Risk = P(Event)*P(Damages) *Consequence ADAPTATION STRATEGIES SITE/FACILITY CHARACTERIZATION Consequence Interview Public Health & Safety Economic Impact Interdependency 23

24 Site Specific Evaluation and Inspection

25 Data Collection and Tabulation 25

26 PHASE 3 ADAPTATION STRATEGIES

27 PHASE 3 ADAPTATION STRATEGIES Source: Massachusetts Stormwater Handbook

28 Adaptation Criteria C.E.F.T.A.C Co-benefits (Mitigation) Cost $$$ Effectiveness (Risk Reduction) Adaptability (Flexibility) Feasibility (Implementation) Timing (Short Term vs. Long Term)

29 Adaptation Strategies Co-benefits CONTRIBUTIVE Opportunity to make changes in your community.

30 DRAW SEVEN PARK Elevate and Protect Elevate grades for critical site features Elevated walkways Flood barriers Incremental Adaptation Identify site evolution Design for future climate impacts Downstream protection Embrace Water Identify areas to embrace water for frequent flooding and storm events CLIMATE RESILIENCE MEASURES TO MANAGE CHRONIC AND ACUTE CHANGES IN ENVIRONMENT OVER TIME Image credit: Brooklyn Bridge Park, Julienne Schaer Image credit: Brooklyn Bridge Park, Etienne Frossard Image credit: Brooklyn Bridge Park, Julienne Schaer

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32 Church Creek Drainage Design

33 Boston Public Works Department Climate Resilient Design Standards Incremental Approaches Transform Harborwalk into flood barrier Source: The Low Battery. Design Division For The Common Good, Create vegetated berms in waterfront open spaces as flood barrier Source: Blackman, Austin, et al. COASTAL RESILIENCE SOLUTIONS FOR EAST BOSTON AND CHARLESTOWN. Climate Ready Boston. Source: Carlson, Jen. Brooklyn Bridge Park Now 80% Complete As Pier 5 Uplands Officially Open. Gothamist, 7 July 2017, 1:55 PM, gothamist.com/2017/07/07/brooklyn_bridge_park_pier_5_uplands_photos.php#photo-10. (left) and Scioto Mile_Columbus_greenways3_MKSK(right)

34 Boston Public Works Department Climate Resilient Design Standards Incremental Approaches Raise roadways to create flood barrier Source: Blackman, Austin, et al. COASTAL RESILIENCE SOLUTIONS FOR EAST BOSTON AND CHARLESTOWN. Climate Ready Boston. Source: ttps:// Standards for deployable flood barriers Source: Austria's mighty mobile flood walls can hold back 15 ft of floodwater-an ingenious initiative! - NTD Inspired Sept. 2017, Source: ILC Dover Side Deployed Flexwall

35 Chelsea Pump Station Example: Resilience tied into existing project Weston & Sampson provided design, permitting, and bidding services. The scope of work included: Approx. 1,400 feet of new stormwater force main and abandonment of existing force main A new discharge structure at a culvert Flood resiliency improvements at the Carter Street Pump Station A wall around the perimeter of the pump station and a surface drain system to remove water captured within the enclosed perimeter

36 Design Considerations Base-flood Elevation Hydrostatic Pressure and Uplift Geotechnical Structural Interior drainage Systems upgrades Emergency Power Access

37 Adaptation Strategies Example VULNERABLE FACILITY ELEMENT Basement doorways to OutdoorEquipment Room, Mechanical Room, etc. LOCATION CLIMATE STRESS North side of site Extreme Precipitation & Flooding PRIORITY High Planning Horizon: Before & During Strategy: Protect Cost $ - $$. Customized to openings Effectiveness Max: depends on structural strength of building walls and connections Feasibility Yes: easy to install, use, store and transport Adaptability Flexible: Adjust to water height Timing- Short term: <1 hour installation Co-benefits - No. Image courtesy of PS Flood Barriers Image courtesy of Global Industrial

38 Design Considerations for Kiawah Surrounded by water Beach erosion Three tidal inlets Transport of fines Settlement Liquefaction Groundwater (existing and future) Ecosystem/Habitat Public Health and Safety Transportation Property and real estate Tourism Salt marsh Drainage and outfalls Power and Electricity Communications

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40 questions? westonandsampson.com

41 thank you westonandsampson.com