WHO WE ARE OUR SERVICES. Since 1899 Over 500 professionals 16 Office Locations on East Coast Three companies

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2 WHO WE ARE OUR SERVICES Since 1899 Over 500 professionals 16 Office Locations on East Coast Three companies Water Wastewater MEP/SCADA Stormwater Climate Resiliency Architecture Landscape Architecture Information Technology/GIS Transportation Solid Waste Hazardous Waste Structural Engineering Geotechnical & Dam Engineering Public Works Facilities Surveying Environmental Science & Permitting Operation & Maintenance Construction

3 CLIMATE RESILIENCY SERVICES Assessments & Studies DCAMM Statewide Resilience Master Plan Vulnerability Assessment & Adaptation Planning for Lynn, MA Resilient Design BPWD Climate Resilient Design Guidelines Waterfront Park Design Draw Seven Park, Somerville, MA Pump Station Resilience Improvements, Chelsea, MA Resource Management Sustainable Water Management Study, Concord, NH Salt Marsh & Habitat Restoration Management, Chelsea Creek, MA Drainage Basin & Flood Mitigation Study, Charleston, SC Emergency Services MBTA Aquarium Flood Response March 2018 Nor Easter

4 b o s t o n. g o v / d e p a r t m e n t s / p u b l i c - w o r k s / c l i m a t e - r e s i l i e n t - d e s i g n - s t a n d a r d s - a n d - g u i d e l i n e s

5 OVERVIEW Climate Resilient Design Standards and Guidelines Goals: Establish resilience design guidelines for discrete priority projects and for segmental adaptation projects to achieve flood protection by 2070, with the option to add an additional 2 ft. of protection in the future Translate the Climate Ready Boston concepts into feasible engineering and operational solutions that focus on protecting public rightof-way from flooding due to tidal and storm surge events Provide a menu of sample flood protection options with engineering design considerations, preliminary cost estimates, as well as operations and maintenance guidance

6 CLIMATE PROJECTIONS Source all: Climate Ready Boston 2016

7 CLIMATE DESIGN ADJUSTMENTS FOR USEFUL LIFE Flooding during the March 2, 2018 Nor easter at Langone Park & Puopolo Playground

8 CLIMATE RESILIENT FLOOD BARRIER DESIGN CONCEPT FOR FLOOD BARRIER DESIGN Design O&M Cost Barrier Selection permitting strategy additional feasibility studies increase reliability incremental adaptation and timeline value creation, social impact, equity, & co-benefits

9 DESIGN CONSIDERATIONS Climate Design Adjustments and Timeline Site Specific and Boundary Constraints Stormwater Considerations Geotechnical Considerations Structural Considerations Utility Considerations Accessibility and Transportation Considerations Groundwater Considerations Vegetative Considerations

10 O&M AND COST CONSIDERATIONS NOT JUST BARRIER OPERATIONS AND MAINTENANCE CONSIDERATIONS! Case Study: Stormwater management for raised roadways in Sunset Harbor, Miami Beach, FL energy costs for pump stations and system redundancy reassigned or new staff (or contractors) to maintain the new pump stations, generators, treatment systems, and utilities associated with stormwater management new O&M equipment needed for stormwater management operations management support staff training Elevated roads and pump station

11 O&M AND COST CONSIDERATIONS Source: Peterborough, NH_January 2018_NewsLocker_Uncredited NOT JUST WATER! SNOW & ICE! Source: (top) Portsmouth, NH_February 2015_Emily Corwin, NHPR, (bottom) Accident on I-93 in NH, no injuries_february 2011_AP, Uncredited

12 SAMPLE FLOOD BARRIERS VEGETATED BERMS RAISED ROADWAYS HARBORWALK FLOOD BARRIER TEMPORARY FLOOD BARRIERS Note: All samples assumed a barrier height of 4 ft. for 2070 flood protection

13 SAMPLE VEGETATED BERM BARRIER Design Elements Site Specific and Boundary Constraints Accessibility and Transportation Considerations Vegetative Considerations Sample Considerations from Guidelines Barrier may be constructed incrementally, minimum crosssection should be for 2070 conditions Crest serves as a pedestrian path (Harborwalk) and connects to downstream areas Path accommodates emergency and maintenance vehicles Trees present a serious risk to embankment stability Open park space with community and environmental benefits, opportunities for multi-purpose berm and open space O&M Similar to Earthen Embankment and Levee O&M practices, also must consider recreational and stormwater related maintenance

14 SAMPLE VEGETATED BERM BARRIER

15 SAMPLE VEGETATED BERM BARRIER

16 SAMPLE HARBORWALK (SEAWALL) BARRIER Design Elements Site Specific and Boundary Constraints Accessibility and Transportation Considerations Vegetative Considerations Sample Considerations from Guidelines Barrier on parcel does not block flood pathway, it will be flanked without barriers constructed off-site Handrail designed for deployable flood barrier beyond 2070 Combined raised grades and seawall allows connection with waterfront, opportunities seated wall Path also for emergency and maintenance vehicles Opportunity to bring more green open space with slopes Inland slope can incorporate green infrastructure stormwater solutions O&M Similar to Seawall O&M practices, also must consider recreational and stormwater related maintenance

17 SAMPLE HARBORWALK (SEAWALL) BARRIER

18 SAMPLE HARBORWALK (SEAWALL) BARRIER

19 SAMPLE RAISED ROADWAY BARRIER Design Elements Site Specific and Boundary Constraints Accessibility and Transportation Considerations Vegetative Considerations Sample Considerations from Guidelines Properties with first floor, basement, and garage access Adjacent properties setback at least 14 ft. from back of sidewalk (not typical of urban setting) (Option 1) Large scale neighborhood redevelopment opportunities (Option 2) Walkability and livability, including ADA accessibility for roadway and building connections Side streets graded to raised roadway (impact beyond roadway) Maintain access (emergency, pedestrian, delivery, maintenance) to properties and communities Trees are a risk to barrier stability, but may be feasible on inland side of barrier with additional design and maintenance practices Inland slope can incorporate green infrastructure stormwater solutions and provide open space Plantings may improve noise and air quality along raised roadway O&M Significant impacts to existing roadway O&M practices, including stormwater management and snow removal.

20 Option 1 SAMPLE RAISED ROADWAY BARRIER

21 SAMPLE RAISED ROADWAY BARRIER Option 1 Consider options to reduce to one-way traffic and add bike lanes, meet Complete Streets Standards

22 SAMPLE RAISED ROADWAY BARRIER Sidewalk gutters (debris, stormwater runoff) Snow removal problems Poor lighting and personal safety Accidents more deadly Vehicle emission pipes at head level of pedestrians (poor air quality ) ADA compliance Emergency accessibility Business and community health

23 Option 2 SAMPLE RAISED ROADWAY BARRIER

24 SAMPLE RAISED ROADWAY BARRIER Option 2 Consider options to reduce to one-way traffic and add bike lanes, meet Complete Streets Standards

25 DEPLOYABLE FLOOD BARRIER Design Considerations for the Site Barrier extent & connection to site Available open space (deployment or storage) Accessibility Terrain conditions Offsite impacts Design Considerations for the Product Physical Characteristics Structural Properties Operational Requirements Industry Warranty, Certification, Testing OPERATIONAL CAPACITY

26 DEPLOYABLE FLOOD BARRIER DEPLOYABLE FLOOD BARRIER

27 DRAFT LANGONE AND PUOPOLO PARK DEPLOYABLE FLOOD BARRIER

28 LANGONE AND PUOPOLO PARK DEPLOYABLE FLOOD BARRIER Flood protection cross-section cantilevered boardwalk DRAFT

29 CLIMATE RESILIENT FLOOD BARRIER DESIGN DEPLOYABLE FLOOD BARRIER Each site has its own set of challenges and opportunities Technical assessment is critical to designing resilient infrastructure improvements Operations and maintenance considerations should be evaluated at early stages of design Barrier design must address trapped stormwater Incremental and flexible design allows infrastructure to extend useful life in uncertain future

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