Climate Change Vulnerability Assessment for Bellevue

CITY OF BELLEVUE In Partnership with the University of Washington

CLIMATE CHANGE VULNERABILITY ASSESSMENT FOR BELLEVUE

City of Bellevue Project Leads Jennifer Ewing Brian Landau

University Instructor: Bob Freitag

Student Authors Kevin Lowe Pelstring Helen Stanton

Livable City Year 2018–2019 in partnership with City of Bellevue Winter–Spring 2019 Livable City Year 2018–2019 in partnership with City of Bellevue www.washington.edu/livable-city-year/ ACKNOWLEDGMENTS

The three reports and analyses included in this document could not have been produced without support from the following people at the City of Bellevue: Kit Paulsen, Senior Environmental Scientist; Rick Bailey, Forest Management Program Supervisor; and August Franzen, Environmental Stewardship Americorps Member. These City staff members led us on tours through Weowna Park, Kelsey Creek Park, and Lake Hills Greenbelt Park to stimulate our thinking about how the City could mitigate the effects of climate change through strategic maintenance and redesign of its parks.We especially want to thank Brian Landau, Utilities Planning Manager, and Jennifer Ewing, Environmental Stewardship Program Manager, for their continued feedback and guidance about our project’s scope of work. Thank you both for joining us on our field trips to the aforementioned parks and for sharing your knowledge about the role and value of Bellevue’s parks.

Students in Bob Freitag’s Hazard Mitigation class joined City staff in a field trip to Weowna Park on February 1, 2019.TERI THOMSON RANDALL

LCY Student Researchers

Rawan Hasan Cassandra Garza Olson CR Hesch Kevin Lowe Pelstring Lauren Kerber Helen Catherine Stanton Mariko Kathleen Kobayashi Rachel Wells Cate Kraska Elora J. Wykes Dorothy Mulkern Kids plant a tree at Bellevue’s annual Arbor Day-Earth Day celebration. CITY OF BELLEVUE CREDITS For this Report City of Bellevue Project Leads Jennifer Ewing Brian Landau City Departments Community Development TABLE OF CONTENTS Utilities Instructor: Bob Freitag About Livable City Year i. University Department: Urban Design and Planning Course: URBDP 549 Hazard Mitigation Planning About Bellevue ii. Student Authors Kevin Lowe Pelstring Bellevue 2035 iii. Helen Stanton Forward v. For the City of Bellevue Mayor: John Chelminiak Executive Summary 01 Deputy Mayor: Lynne Robinson Council Members Introduction 03 Conrad Lee Jared Nieuwenhuis Methodology 09 Jennifer Robertson John Stokes Human Well-Being 13 Janice Zahn City Manager: Brad Miyake Urban Flooding 27 Deputy City Managers Mary Kate Berens Nathan McCommon Urban Tree Canopy 39 LCY Program Managers Nancy LaCombe Conclusion 53 Danielle Verwahren References 55

For the University of Washington LCY Program

LCY Faculty Co-Directors Permission to use: This report represents original student work and Branden Born recommendations prepared by students in the University of Washington’s Jennifer Otten Livable City Year Program for the City of Bellevue. Text and images Program Manager: Teri Thomson Randall contained in this report may be used for not-for-profit purposes. Program Assistant: Michelle Abunaja Editor: Liza Higbee-Robinson Recommended citation: Pelstring, Kevin Lowe and Stanton, Graphic Designers Helen. Climate Change Vulnerability Assessment for Bellevue. Linya Cheng Seattle: University of Washington, Livable City Year. 2018–2019. Ka Yan (Karen) Lee Communications: Daimon Eklund ABOUT LIVABLE CITY YEAR ABOUT CITY OF BELLEVUE

The University of Washington’s Livable City Year (LCY) initiative is a partnership Bellevue is the fifth largest city in Washington, with a population of more than between the university and one local government for one academic year. The 140,000. It’s the high-tech and retail center of King County’s Eastside, with more than program engages UW faculty and students across a broad range of disciplines to 150,000 jobs and a skyline of gleaming high-rises. While business booms downtown, work on city-defined projects that promote local sustainability and livability goals. much of Bellevue retains a small-town feel, with thriving, woodsy neighborhoods Each year hundreds of students work on high-priority projects, creating momentum and a vast network of green spaces, miles and miles of nature trails, public parks, on real-world challenges while serving and learning from communities. Partner cities and swim beaches. The community is known for its beautiful parks, top schools, and benefit directly from bold and applied ideas that propel fresh thinking, improve a vibrant economy. Bellevue is routinely ranked among the best mid-sized cities in livability for residents, and invigorate city staff. Focus areas include environmental the country. sustainability; economic viability; population health; and social equity, inclusion The city spans more than 33 square miles between Lake Washington and Lake and access. The program’s 2018–2019 partner is the City of Bellevue; this follows Sammamish and is a short drive from the Cascade Mountains. Bellevue prides itself partnerships with the City of Tacoma (2017–2018) and the City of Auburn (2016– on its diversity. Thirty-seven percent of its residents were born outside of the US 2017). and more than 50 percent of residents are people of color, making the city one of LCY is modeled after the University of Oregon’s Sustainable City Year Program, and the most diverse in Washington state. is a member of the Educational Partnerships for Innovation in Communities Network Bellevue is an emerging global city, home to some of the world’s most innovative (EPIC-N), an international network of institutions that have successfully adopted this technology companies. It attracts top talent makers such as the University of new model for community innovation and change. For more information, contact Washington-Tsinghua University Global Innovation Exchange. Retail options abound the program at [email protected]. in Bellevue and artists from around the country enter striking new works in the Bellwether arts festival. Bellevue’s agrarian traditions are celebrated at popular seasonal fairs at the Kelsey Creek Farm Park. Bellevue 2035, the City Council’s 20-year vision for the city, outlines the city’s commitment to its vision: “Bellevue welcomes the world. Our diversity is our strength. We embrace the future while respecting our past.” Each project completed under the Livable City Year partnership ties to one of the plan’s strategic areas and many directly support the three-year priorities identified by the council in 2018. BELLEVUE 2035: BELLEVUE 2035: THE CITY WHERE YOU WANT TO BE THE CITY WHERE YOU WANT TO BE

Climate Change Vulnerability Assessment for Bellevue supports the High Quality Built Bellevue welcomes the world. Our diversity is our strength. and Natural Environment target area of the Bellevue City Council Vision Priorities We embrace the future while respecting our past. and was sponsored by the Community Development and Utilities departments. The seven strategic target areas identified in the Bellevue City Council Vision Priorities are: HIGH QUALITY BUILT AND NATURAL ENVIRONMENT ECONOMIC DEVELOPMENT Bellevue has it all. From a livable high-rise urban environment to large wooded lots Bellevue business is global and local. in an equestrian setting, people can find exactly where they want to live and work in Bellevue. The diverse and well-balanced mix of business and commercial properties and wide variety of housing types attract workers and families who desire a safe, TRANSPORTATION AND MOBILITY Transportation is both reliable and predictable. Mode choices are sustainable, and accessible community. abundant and safe. Bellevue has an abundance of parks and natural open space. Known as a “city in a park,” our park system is one of the best in the nation due to its high park HIGH QUALITY BUILT AND NATURAL ENVIRONMENT acreage-to-population ratio. From neighborhood walking paths and forested trails From a livable high-rise urban environment to large wooded lots in an to a regional waterfront park, we enjoy a variety of recreational opportunities equestrian setting, people can find exactly where they want to live and within walking distance of our homes and businesses. Bellevue is a “Smart City” work. with a clean, high-quality environment and excellent, reliable infrastructure that supports our vibrant and growing city, including high-tech connectivity. The city BELLEVUE: GREAT PLACES WHERE YOU WANT TO BE has a connected multi-modal transportation system that blends seamlessly with its Bellevue is a place to be inspired by cuilture, entertainment, and nature. buildings, plazas, and parks.

Whether it’s an urban high rise, a classic Bellevue rambler, or a historic resource, the REGIONAL LEADERSHIP AND INFLUENCE constant is our people. Our neighborhoods and businesses transcend age, ethnicity, Bellevue will lead, catalyze, and partner with our neighbors throughout and culture to create safe, welcoming places to live and work. the region.

ACHIEVING HUMAN POTENTIAL Bellevue is caring community where all residents enjoy a high quality life.

HIGH PERFORMANCE GOVERNMENT People are attracted to live here because they see that city government is well managed.

For more information please visit: https://bellevuewa.gov/city-government/city- council/council-vision

iii | LIVABLE CITY YEAR CLIMATE CHANGE | iv FOREWORD

We are pleased to have had the opportunity to formulate the suggestions presented in this document and to demonstrate the value of applying a scenario planning process. This process, and the ideas included within this report, are written to help guide a future rigorous public planning effort. Please realize that the ideas offered within this report represent the efforts of student teams, as well as the research of two students who expanded each team’s initial findings. This project stands as one of several assignments students completed over a ten-week period. The suggestions of this report are not the result of a public planning process. Therefore, this report cannot be considered a plan. Students did not hold public meetings, nor did they rigorously analyze the consequences of their suggestions. However, the ideas contained within this report can be thought of as a starting point for such a plan to be carried out by the City of Bellevue. We would be pleased to discuss any aspect of this report in order to Hazard Mitigation Planning students present their project findings to City of Bellevue staff. TERI THOMSON RANDALL further support the City as it explores strategies to adapt to a changing climate within the context of a changing Bellevue.

Jennifer Ewing, Community Development, and Jerry Shuster, Utilities Department, offer feedback to students during their final presentation. TERI THOMSON RANDALL

v | LIVABLE CITY YEAR CLIMATE CHANGE | vi EXECUTIVE SUMMARY

Bellevue anticipates great change in coming years and decades as a result of climate change and population growth. Uncertainty and potentially catastrophic consequences related to the compounding effects of climate change and increased urbanization are important for the City of Bellevue to evaluate and incorporate into its long-term planning now. University of Washington (UW) graduate students taking a Hazard Mitigation Planning course considered three topics of particular concern to the City of Bellevue: Scenario planning 1. The tangible effects of climate change on the well-being of current is a systematic and future residents of Bellevue method for 2. The vulnerability induced by rapid urban development and more frequent and intense storms Students visited Weowna Park to consider how through strategic maintenance envisioning 3. The role of urban tree canopy culturally and aesthetically, as well and redesign of parks the City may mitigate effects of climate change. CITY OF BELLEVUE potential as for developing resilience to climate change While attending to urban growth projections, resilience to climate change We applied scenario planning to each of these three topics to see outcomes should be considered a primary goal for Bellevue over the next few decades. how changes in precipitation and heat interact with urban systems. This is because resilience to climate change is essential for maintaining the produced by Scenario planning is a systematic method for envisioning potential city’s livability. To prepare for climate change, the City of Bellevue may need to outcomes produced by complex and uncertain factors set in the future complex and modify or replace infrastructure, protect or reinforce features of the natural (Peterson, et al. 2003). Each scenario is the result of plausible events environment, and accommodate new needs and vulnerabilities of residents. uncertain factors and environmental drivers, and would require different courses of action Starting points for the City to become resilient to climate change include: and strategic decision making to occur (Wilburn 2011). Thus, scenario set in the future. planning serves as a lens for planners to envision possible, probable, or • Providing access to shelters for people in need of refuge plausible future outcomes of climate change and urbanization. Equipped • Increasing access to medical care with such information, planners can attend to possible future events and • Incentivizing renewable energy opportunities conceptualize plans and course of action accordingly. • Promoting and dispersing mixed-use social infrastructures • Retrofitting aging development • Expanding the use of low impact development • Redesigning parks • Installing onsite water detention features in up-zoned areas • Creating a comprehensive tree inventory • Establishing a regional urban tree canopy climate stressors research organization • Facilitating assisted species migration • Improving wildland fire mitigation and adaptation

This document has been produced to encourage rigorous public planning efforts. The suggestions offered represent the efforts of student teams, as well as the work of two individual students who further expanded the scope of research. The suggestions are not the result of a public planning process, and, therefore, this document cannot be considered a plan. Rather, this document Bellevue’s parks promote public health and livability. CITY OF BELLEVUE may be considered as a starting point for subsequent planning efforts.

1 | LIVABLE CITY YEAR CLIMATE CHANGE | 2 INTRODUCTION

As a result of climate change and increased urbanization, the City of IDENTIFYING THE CITY’S CHALLENGE Bellevue and surrounding Puget Sound region are likely to encounter sweeping change in coming years and decades. Bellevue, like countless Bellevue, like cities everywhere, experiences change over time. There other cities and towns throughout the region, is presented with are two primary modes of change cities encounter: intrinsic (changes challenges and opportunities which require comprehensive, long-range influenced to large degree by decisions made by the City) and extrinsic planning. Rather than considering itself powerless to the potential effects (changes which occur regardless of City decision making). Intrinsic of climate change, the City of Bellevue can assume itself capable of taking changes in population, urban density, and economy are somewhat within direct action to plan and prepare for a range of potential scenarios. the City’s control; extrinsic change, like climate change, is not. Accounting for these two sets of changes (intrinsic change as a result of urban This Livable City Year project (LCY) explores three topics related to climate growth, and extrinsic change related to global climate change), students change and urbanization, all of which are critical to the future livability of involved in this LCY project evaluated several potential future scenarios the City of Bellevue: within their reports related to human well-being, urban flooding, and urban tree canopy. 1. Human well-being 2. Urban flooding 3. Urban tree canopy (UTC)

These topics were captured originally within three distinct reports generated by graduate students enrolled in a Hazard Mitigation Planning course at the UW during Winter Quarter of 2019. Student teams received support and guidance from City of Bellevue staff. The original reports generated by each student team are presented as three main sections within this document.

Rather than considering itself powerless to the potential effects of climate change, the City of Bellevue can assume itself capable of taking direct action to plan and prepare for a range of potential scenarios.

This view from Bellevue City Center toward Lake Washington and Seattle captures Bellevue’s “city in a park” motto. CURT SMITH

3 | LIVABLE CITY YEAR CLIMATE CHANGE | 4 VALUES OF BELLEVUE BELLEVUE PARKS GUIDE 1 2 3 4 5 6 7 8 9 10

S 9 AV S T A NE 70 ST DR 1 0 T

1 N E E 7

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NE 37 PL NE 37 ST 0 N E

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City-owned parks are shown in the map to the right. Ongoing work to V 8 V 1 N A

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N E E A 1 NE 21 ST

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NE E N 1 A V E HEART 1 4 NE 14 ST N 6 P the city culturally and in terms of policymaking. The City’s parks are A E NE 15 PL Park L ELEM. 8 M

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continued presence is key to supporting the City’s core value of access to E 1 Y L 6

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1 road networks to accommodate all modes of transportation and by L Bellevue City Parks Mountain to Sound Trail City of Bellevue e g Other Parks Lake-to-Lake Trail Outside of City Lake-to-Lake Trail * Please reference Bellevue Bike Map for more detailed route information. e Community Centers O Bicycle Route* constructing those networks to withstand anticipated natural hazards n www.bellevuewa.gov Produced by City of Bellevue Geospatial Technology Services and d Trail School Property Graphics Services. ©2016 City of Bellevue, all rights reserved.

related to climate change, the City can become more climate resilient and mc2409A_5.17.indd ensure residents are able to visit and enjoy natural spaces long into the CITY OF BELLEVUE future.

5 | LIVABLE CITY YEAR CLIMATE CHANGE | 6 SAFE AND FUNCTIONING NATURAL AND BUILT ENVIRONMENTS Just as natural environments may struggle to adapt to climatic change and to altered land uses, built systems may also become overwhelmed by similar change processes. As a result, built systems may no longer function optimally or serve their intended purposes. As climate change results in increased frequency of storm events, for example, older systems must be adapted or upgraded to provide more pervious surface coverage to support increased stormwater runoff. Natural environments may also require additional support to handle increased stormwater volumes and to adapt more quickly to climate change.

A CITY THAT SUPPORTS HUMAN WELL-BEING An environment that promotes human health, well-being, and livability is of high value to all residents. Human well-being (HWB) encompasses security, basic materials for a good life, health, good social relations, and freedom of choice (Millennium Eco Assessment 2005). Open space, trees, and streams characterize Weowna Park, one site in which students conducted field observations. LCY STUDENT TEAM COMMUNITY ASSETS SUPPORT THESE VALUES The values embraced by Bellevue have associated assets. These assets include the existing urban tree canopy and flora; parks, such as Weowna Park, Kelsey Creek Park, and Phantom Lake; stormwater facilities which protect natural and built environments from hazards that could significantly damage them; and transportation networks and supportive infrastructure such as parking, bus systems, roadways, and pedestrian and bike facilities. This multitude of assets combines to allow residents and visitors alike to access parks and open spaces. The first report presented in this document (focused on human well- being) hones in on how the City can continue to support human well-being by implementing a set of mitigation strategies that protect and enhance assets like shelter/housing, medical facilities, and social infrastructure. The second two reports (focused on urban flooding and urban tree canopy) outline potential mitigation strategies for protecting assets that support the core value of access to open space. Blueberry plants along Kelsey Creek are an important local landmark vulnerable to flooding. KEVIN LOWE PELSTRING

7 | LIVABLE CITY YEAR CLIMATE CHANGE | 8 METHODOLOGY

SCENARIO PLANNING CLIMATE CHANGE For each of the three reports combined in this document, student teams Climate change is already occurring in the area. In the coming years applied a scenario planning framework to explore four plausible futures and decades, as a result of climate change, increased frequency of for Bellevue. In each case, students considered intrinsic and extrinsic extreme weather events is likely. What we conceived of in the past as change factors as key drivers. representing 10-year or 100-year storm events are poised to become annual or semiannual events by midcentury. These storms will impact a Scenario planning is a systematic method for envisioning possible different Bellevue from the one we know today. Among other changes complex and uncertain futures (scenarios) (Peterson, Cumming, and Bellevue will endure, the city will be home to a larger at-risk population as Carterpenter 2003). Scenarios are based on plausible consequences a result of population growth and increased urbanization. Herein lie both of events and environmental drivers that could occur. A primary goal in opportunities and risks. A future Bellevue could experience less flood scenario planning is to consider likely impacts possible situations would damage because of careful planning and design targeting the introduction have on strategic decision making processes (Wilburn 2011). Within of more permeable surfaces, and less vulnerability to drought as a result scenario planning, a range of possible futures is considered, with no single of increased water storage availability; or, the city could face more flood scenario receiving prioritization over another, regardless of their relative damage as a result of increased presence of impervious surfaces, and probability (Enzmann, Beauchamp, and Norbash 2011). Scenario planning more vulnerability to drought as a result of not creating more storage is considered a useful tool for planners to envision a range of possible/ space for water. One thing is certain: The way in which the City prepares plausible scenarios and to devise plans accordingly. When applied, for and manages future weather events is critical for supporting the scenario planning helps widen perspectives on what the future may entail livelihood of residents of Bellevue. and can make it easier to recognize a range of potential challenges and opportunities (Gunnarsson-Östling, and Höjer 2011). The climate change driver describes, for the most part, a future based on one of two scenarios: 1. Scenario A: Carbon emissions increase.

DRIVERS 2. Scenario B: Carbon emissions remain constant. For each framework in a scenario planning model, two drivers are measured against each other. Each of the three reports combined URBANIZATION in this document refer to the same drivers of climate change and urbanization. The first driver addresses climate change, an extrinsic force. Urbanization, like climate change, is also already occurring in Bellevue, Since Bellevue is subject to other change, a second driver introduces reflective of the city’s steadily growing population. As a result, the City urbanization, an intrinsic force. While the general drivers of climate must plan for continued development and redevelopment to meet the change and urbanization remain the same in each of the three reports, needs of more people. Population growth is accounted for in Bellevue’s students determined distinct variables to account for the drivers in their Comprehensive Plan. This plan outlines designated growth areas work and created four distinct scenarios for each report. throughout the city and directs preservation of Bellevue’s natural assets, which include its parks and open spaces. The plan introduces a set of policies to preserve parks and green spaces. THREE REPORTS WITH SELECT CLIMATE CHANGE AND URBANIZATION VARIABLES The urbanization driver is aspirational and reflective of Bellevue’s Comprehensive Plan, which presents a future in which: Report Climate change variable Urbanization variable 1. New growth is concentrated in designated high-density areas. Human well-being Extreme weather events Population increase 2. The City of Bellevue remains single family in character. Flooding Large storm events Impervious surface coverage 3. Jobs are available to local residents. Urban tree canopy Climate stressors Population increase

HELEN STANTON

9 | LIVABLE CITY YEAR CLIMATE CHANGE | 10 MODELING THE EFFECTS OF CLIMATE SCENARIO PLANNING FRAMEWORK CHANGE IN BELLEVUE By 2080, the reliability ensemble averaging value (REA) of temperature change is calculated at almost 3.4°C (6.1°F) for scenario A (carbon emissions increase) and at 2.5°C (4.5°F) for the scenario B (carbon emissions remain constant). The range for these two scenarios is from 1.5 to 5.8°C (2.8 to 9.7°F). Individual precipitation models produce varied changes ranging from a -10% decrease to a +20% increase in annual precipitation by the 2080s in the Puget Sound region. These changes in climate direct the following aspects of this project:

1. The tangible effects of climate change on the current and future well-being of Bellevue residents. 2. The expected vulnerability resultant from rapid urbanization and increasingly frequent storms. 3. The integral role of urban tree canopy culturally and aesthetically, as well as for creating climate resilience.

By evaluating the 12 scenarios presented within this document (four from each of the three reports), we illustrate how changes in extreme weather events are likely to compound with the effects of urban growth and interact with select systems of public and private built environments. To determine precise measures to mitigate the effects of climate change and urbanization, the City of Bellevue can engage in further study.

RELIABILITY ENSEMBLE AVERAGING (REA) REA refers to the temperate changes of each season and decade. REA values are calculated by weighing each model by its variance and distance from the average of all models.

HELEN STANTON AND LIZA HIGBEE-ROBINSON

11 | LIVABLE CITY YEAR CLIMATE CHANGE | 12 HUMAN WELL-BEING

CLIMATE CHANGE IMPACTS BELLEVUE’S HUMAN WELL-BEING FIVE COMPONENTS OF HUMAN WELL-BEING Climate change impacts in the Pacific Northwest are upon us, with Each component of human well-being is supported and sustained by the provision of particular assets, increased heat events and more frequent and intense winter weather referred to within this section. The five components of human well-being are described below: events occurring in recent years. These types of extreme weather events 1. Security includes safe access to natural resources, such as parks, recreation areas, and are expected to continue to increase into the future (Climate Change general safety resources like emergency and fire services. General safety of persons and Impacts Group 2019). possessions also factors into security (Millennium Ecosystem Assessment 2005). For Bellevue, Along with increased frequency of severe weather events, Bellevue’s assets which support security include the City’s police force, fire department, emergency population has grown, from 122,363 residents in 2010 to 147,000 medical services, and safe public spaces. Security from natural disasters is addressed by the in 2017 (City of Bellevue 2017). The City anticipates more growth to City’s Comprehensive Emergency Management Plan (2013), which presents management accompany the introduction of Sound Transit Link light rail in 2023. This and hazard mitigation strategies for specific hazards, especially flooding, earthquakes, and transportation option will increase access to and from Bellevue, and could landslides. contribute to growth which exceeds the current projection of a 1% annual 2. Basic material for good life entails income and assets, food security, adequate shelter, increase (City of Bellevue 2017). This section reviews how increased furniture, clothing, and access to other goods and services (Millennium Ecosystem Assessment extreme weather events attributed to climate change will impact human 2005). Assets which support this component include adequate affordable housing supply; well-being as Bellevue grows. employment, education, and job training opportunities; emergency accommodations and homeless shelters; retail and grocery stores; farmers markets, community gardens, and soup The Millennium Ecosystem Assessment (2005) identifies five kitchens. characteristics of human well-being: security, basic material for good life, 3. The health component refers to one’s physical strength and wellness. It also involves a health, good social relations, and freedom of choice and action. In this healthy environment with provides people with access to clean air and water (Millennium section, we assess each of these in view of possible impacts of climate Ecosystem Assessment 2005). Assets in Bellevue that support this component include medical change in conjunction with increased urbanization in Bellevue. Then, we centers, hospitals, nursing and treatment facilities, water treatment facilities, drainage systems, propose strategies to mitigate adverse impacts of climate change and recreation areas, parks, and green space. urbanization in order to support human well-being. 4. Good social relations encompasses qualities of social cohesion, mutual respect for one another, and one’s ability to help others (Millennium Ecosystem Assessment 2005). This component is supported through intangible assets, including bonding, social networks, and community norms and values (OECD 2009). Tangible assets that support good social relations include community gathering spaces like churches, schools, civic clubs, sports clubs, community centers, neighborhood associations, and volunteer groups, all of which bring We propose strategies to mitigate people together around common interests or purpose and foster one’s sense of belonging within a group (Bolton 2011). adverse impacts of climate change and 5. Freedom of choice refers to one’s sense of autonomy and control over what happens in urbanization in order to support human their life. It includes feeling able to pursue and achieve goals aligned with one’s core values (Millennium Ecosystem Assessment 2005). Local government agencies can support this well-being. component by ensuring basic human rights and freedom of lifestyle choices.

13 | LIVABLE CITY YEAR CLIMATE CHANGE | 14 Two of the five components of human well-being stand to be especially The moderate summer warming scenario represents what experts impacted by the compounding effects of climate change and increased consider to be the most reliable projection for the greater Seattle area. urbanization: basic material for a good life and health. Thus, these According to this scenario, in 2025, the greater Seattle area can expect are focused on within this section. Both population growth and more to endure “3.6 heat events with a mean duration of 2.3 days, and in 2085 frequent and severe weather events are likely to produce stress and this will increase to 7.2 heat events of 2.9 days mean duration” (Jackson, pressure related to providing adequate housing supply and temporary et al. 2009). Extreme weather episodes link to a multitude of health shelters to residents of Bellevue. According to the United States Global complications that impact different populations. An aging population, Change Research Program (2016), human health is likely to be impacted in particular, is more likely to include more at-risk individuals. In part, by climate change in two main ways: this is because hotter temperatures reduce the effectiveness of many medications (Jackson, et al. 2009). 1. Increased severity and/or frequency of certain health problems Extreme weather events refer not just to periods of intense heat, but 2. Creation of new health threats also to periods of severe cold. While winters in the Puget Sound area are predicted to be warmer and wetter in the future, episodic cold snaps will SCENARIO PLANNING feature temperatures that plummet suddenly. It is possible that extreme DRIVER: CLIMATE CHANGE cold weather events will be more common in the future as a result of warmer temperatures in the arctic region pushing cold air southward The City of Bellevue is not immune to effects of climate change. as a polar vortex weather pattern (Kretschmer, Coumou, Agel, Barlow, Climatologists suggest that extreme weather events (periods of extreme Tziperman, and Cohen 2018). Extreme cold weather events featuring heat and cold) will become more frequent and longer-lasting. The primary heavy snowfall can cause significant damage to infrastructure and create impacts of these events will be felt by densely populated cities and power outages. Severe cold also increases the risk of people contracting metropolitan regions that have historically experienced mild summers hypothermia; in particular, this threatens people who are experiencing and whose residents are not set up with air conditioning (Jackson, Yost, homelessness and others who lack adequate, reliable shelter. Karr, Fitzpatrick, Lamb, Chung, Chen, Avise, Rosenblatt, and Fenske 2009). Attribute: Extreme Weather Event Frequency Climate change impacts Cities and regions that match these characteristics, such as the Seattle currently experienced in Bellevue, and research which suggests increased area, are very likely to experience increased morbidity and mortality rates occurrence of extreme weather events in the future, create the two end (Isaksen, Yost, Hom, Ren, Lyons, and Fenske 2015). points for this variable:

1. Moderate increases in frequency of extreme weather events 2. Large increases in frequency of extreme weather events GREATER SEATTLE AREA PROJECTED SUMMER WARMING AND POPULATION MORTALITY FOR 2025, 2045, AND 2085

Moderate summer warming High summer warming Low summer warming scenario scenario scenario Population growth and more frequent The greater Seattle area can The greater Seattle area can The greater Seattle area can and severe weather events are likely to expect 68 excess deaths in 2025, expect 101 excess deaths in expect 211 excess deaths in 89 excess deaths in 2045, and 2025, 156 excess deaths in 2045, 2025, 401 excess deaths in produce pressure related to providing 107 excess deaths in 2085. and 280 excess deaths in 2085. 2045, and 988 excess deaths in 2085. housing and temporary shelters to HELEN STANTON residents of Bellevue.

15 | LIVABLE CITY YEAR CLIMATE CHANGE | 16 DRIVER: URBANIZATION BELLEVUE’S SIX MIXED-USE CENTERS In 2017, Bellevue reported having a population of 140,700 people, making it the fifth largest city in the State of Washington (City of Bellevue 2017). As the overall Seattle metropolitan area continues to grow, with the ever-evolving technology sector expanding throughout the Puget Sound region, the City of Bellevue prepares for population growth that could exceed the current projection of a 1% rate of annual growth (Levy 2018). As baby boomers age, the proportion of older adults in Bellevue is increasing, further evening out the age distribution within the city (City of Bellevue 2017). The City of Bellevue also faces effects of increased transportation connectivity and accessibility between Seattle and Bellevue as a result of Sound Transit projects. The Link light rail will provide a reliable, 20-minute (each way) commuter option to people who travel between Bellevue and Seattle. This will reduce travel times between the two cities substantially and make Bellevue more attractive to people who work in downtown Seattle (Sound Transit 2019). The City has built into its urban planning framework ways to account for anticipated population growth. For example, the City has six designated mixed-use centers. These are planned to accommodate a significant CITY OF BELLEVUE portion of the city’s growth (City of Bellevue Comprehensive Plan 2015). BELLEVUE POPULATION 1953 TO 2017, FORECAST TO 2035 Attribute: Population Growth Two end points for the population growth attribute frame the four scenarios for this report: at one end, the 1% WITH PERCENT SHARE OF GROWTH FROM ANNEXATION AND predicted annual population growth rate; at the other end, a rate that NATURAL INCREASE OR IMMIGRATION exceeds the anticipated 1% annual growth rate.

1. Projected increase in Bellevue’s population and distribution (1% annual rate of growth) 2. Larger than anticipated increase in population and distribution

CITY OF BELLEVUE

17 | LIVABLE CITY YEAR CLIMATE CHANGE | 18 HUMAN WELL-BEING SCENARIO PLANNING FRAMEWORK SCENARIO 1. LARGE INCREASE IN EXTREME WEATHER EVENT FREQUENCY AND LARGER THAN PROJECTED POPULATION INCREASE More people reside in Bellevue than the City accounted for in its Comprehensive Plan. This places excess demand on assets that are essential for human well-being, like shelter and access to medical care. There is also an increased occurrence of extreme weather events, indicated by bouts of severe cold in the winter months and severe heat in the summer months. Weather patterns change abruptly and stress assets that generate and sustain human well-being. Local travel is frequently disrupted as a result of increased traffic and extreme weather events, such as snow storms. Some residents feel isolated and find themselves unable to access health care and other services. Booming population growth puts extra pressure on the housing market. In particular, the demand for affordable housing and for temporary shelters is at an all-time high. Increased urban density also puts pressure on existing infrastructure and human services. For example, emergency services to assist vulnerable populations are unable to meet the demand for them during extreme weather events. This results in increased morbidity, especially among vulnerable populations, which include elderly, disabled, and homeless populations (Eric Klinenberg 2002). The combined effects of population growth and extreme weather events presented in this scenario refer to the most plausible future pressures and challenges the City of Bellevue will face. Mitigating this scenario also requires the most drastic action. Although Bellevue is planning for a 1% annual population increase, it behooves the City to prepare for the potential for even more growth. This is especially crucial for the City to plan and strategize for emergency situations.

Although Bellevue is planning for a 1% annual population increase, it behooves the City to prepare for the HELEN STANTON AND LIZA HIGBEE-ROBINSON potential for even more growth.

19 | LIVABLE CITY YEAR CLIMATE CHANGE | 20 SCENARIO 2. MODERATE INCREASE IN EXTREME SCENARIO 4. LARGE INCREASE IN EXTREME WEATHER EVENT FREQUENCY AND LARGER THAN WEATHER EVENT FREQUENCY AND PROJECTED PROJECTED POPULATION INCREASE POPULATION INCREASE Bellevue experiences greater population increase than it accounted for in Significant increases in the frequency of extreme weather events bring its Comprehensive Plan. Moderate increases in extreme weather events bouts of extreme heat and extreme cold to Bellevue, and there is less bring severe heat events in the summer and severe cold events in the time in between such events. With population growth in line with current winter, but these events occur less frequently. The increase in population, projections, the City is prepared to meet the demand for emergency beyond what the City planned for, places more pressure on assets that resources through much of the year. However, challenges arise during support human well-being. This jeopardizes human health and quality of and in the aftermath of extreme weather events. At times many residents life. struggle to access essential resources. Future residents may find accessing goods and services more difficult as Demand for shelter from extreme cold and extreme heat occurs more increased traffic and crowding may deter them from leaving their homes. frequently, especially in areas which have been planned to accommodate Spikes in demand for basic goods due to extreme weather events will population growth (e.g., the six mixed-use centers). While the impacts of exacerbate congestion and overwhelm the public transportation system, extreme weather events featured in this scenario match those of scenario making it even more difficult for some residents to access basic goods one, it is likely that emergency management resources will be less and services. strained since population growth reflects current projections, which the A moderate increase in the occurrence of extreme weather events is City now plans to accommodate. With careful planning and by accounting somewhat manageable with emergency services. Medical care providers for increased demand for human resources during extreme weather and shelters help manage periodic peaks in demand during extreme events, this scenario can be managed. weather events.

SCENARIO 3. MODERATE INCREASE IN EXTREME WEATHER EVENT FREQUENCY AND PROJECTED POPULATION INCREASE This scenario invokes the least possible adverse impacts. It reflects In scenarios characterized by more anticipated population growth and only a moderate increase in the frequent and intense extreme weather occurrence of extreme weather events. Although this scenario is possible, it is the least probable of the four considered in this section. The rate of events, the need for refuge during change is gradual and the City is able to plan and accommodate it fairly easily, relative to other scenarios. periods of crisis also increases. Even so, residents will be inconvenienced as the frequency, magnitude, and length of extreme weather events will still increase from present rates and conditions. When extreme heat and extreme cold weather events strike, increased demand for emergency services, like shelter and medical care, will result. The City is able to manage the needs of its population since less overall growth has occurred. Currently, Bellevue planning documents are in line with this scenario.

21 | LIVABLE CITY YEAR CLIMATE CHANGE | 22 IMPACTS (i.e., air conditioning and heating) will be necessary for all residents, and will require more energy consumption. Access to other basic materials, Human well-being impacts described in scenarios one and four above, such as food and clothing, may also be impacted by extreme weather as well as mitigation strategies for those potential impacts, are the focus events, during which residents may be advised to stay home. This is of this section. Scenarios one and four have been selected because both particularly problematic for residents who lack permanent shelters, for involve large increases in the frequency of extreme weather events that those who live in isolation, and for those without access to private vehicles will affect human well-being. In scenario one, the impacts on human or other reliable transportation. well-being are more severe since increased population growth, beyond what the City of Bellevue is prepared to accommodate, occurs. This The health component includes physical strength and wellness as well places greater strain on human well-being resources and prevents as access to clean air and water (Millennium Ecosystem Assessment supply of goods and emergency services from meeting the demand of 2005). With increased occurrence of extreme weather events and residents, especially during and after extreme weather events. Of the population growth, Bellevue will experience spikes in demand for health five components of human well-being referred to earlier in this section services. Heat events can lead to dehydration and other heat-related (security, basic material for good life, health, good social relations, and complications, increasing demand for medical services. Medical services freedom of choice), the two that become most threatened by climate will be particularly strained when wildfires break out. As a result of change are basic material for good life and health. wildfires, more people will suffer the effects of chronic health problems related to heavily polluted air. Winter storms will also strain the healthcare Basic material for good life includes “secure and adequate livelihood, system, as incidence of illness is found to increase when populations are including income and assets, enough food and water at all times, shelter, exposed to conditions of extreme cold. It will be particularly challenging ability to have energy to keep warm and cool, and access to goods” to provide services to individuals and households set in isolated areas. (Millennium Ecosystem Assessment 2005). In scenarios characterized These people may struggle to access the medical assistance they require. by more frequent and intense extreme weather events, the need for refuge during periods of crisis also increases. This may be true for diverse individuals and communities, regardless of whether one owns a home, rents a home, or is experiencing homelessness. Indoor climate control

2014 Carlton Complex Fire burning in Washington State JASON KRIESS Two members of the Human Well-Being Team during their final presentation, from left to right: Rawan Hasan, Mariko Kobayashi TERI THOMSON RANDALL

23 | LIVABLE CITY YEAR CLIMATE CHANGE | 24 STRATEGIES 2. Increase access to medical care For the health component of human well-being, the most significant Bellevue’s Comprehensive Plan seeks to address and prepare the city climate change-induced stress will revolve around access to health service for projected population growth. We recommend the City also consider providers, care facilities, and emergency medical supplies. Extreme how human well-being will be impacted by climate change, especially as a heat events often lead to heat-related illnesses, such as heat stroke and result of increased frequency of extreme weather events. Strategies and dehydration. Exposure to poor air can also threaten one’s health. On recommendations to address the effects of climate change on human the other hand, extreme cold events often lead to hyperthermia and well-being in a growing Bellevue follow. flu outbreaks. Spikes in these health issues will place greater demand 1. Increase access to shelters during extreme heat and extreme on medical services and health care providers. As Bellevue’s population cold weather events grows and as it faces increased frequency of severe weather events, the city is likely to struggle to provide adequate health services. Related to the basic material for good life component of human well- being, the City’s ability to guarantee residents’ access to adequate shelter To help mitigate this, Bellevue can decentralize its medical system and during extreme heat and extreme cold weather events is of utmost create scattered medical services throughout the areas planned to importance for supporting human health and quality of life. To address accommodate population growth. This will ensure medical services are this, the City of Bellevue will need to ensure there is sufficient housing accessible to more people and prevent central hospitals from becoming supply for residents and enough temporary shelters to accommodate overwhelmed during periods of crisis. Dispersal of medical services homeless populations as well as others who may become displaced by throughout the city can occur incrementally and can be accompanied extreme weather events. Shelters should be scattered throughout the by the use of temporary climate relief centers for members of the public city, with more concentrated in areas where homeless people live. to access climate-controlled spaces as needed. To address isolated populations, the City can invest in setting up online consultations with The Bellevue Comprehensive Plan addresses the city’s need for affordable medical doctors. housing and how this need stands to increase as the city grows. Tools to help create more affordable housing stock can be adopted, such as requiring developers to set aside a minimum number of affordable units. This would be similar to Seattle’s Mandatory Affordable Housing (MHA) policy. In addition to creating more affordable housing, the provision of shelters and public buildings with heating and air conditioning is crucial for supporting vulnerable community members.

By scattering medical services throughout areas planned to accommodate growth, the City can prevent central hospitals from becoming overwhelmed during periods of crisis.

A mobile medical unit in Belle Chase, Louisiana ROBERT KAUFFMAN

25 | LIVABLE CITY YEAR CLIMATE CHANGE | 26 3. Incentivize renewable energy opportunities 4. Promote and disperse mixed-use infrastructure Bellevue’s Comprehensive Plan designates six mixed-use centers to In line with the theme of decentralizing medical care, areas designated accommodate anticipated population growth. Ensuring housing stock to accommodate population growth should be equipped with adequate is sufficient in these areas is essential for a future, denser Bellevue. amenities for residents. In addition to providing housing units, these areas With increased population and increased climate control technology can play host to social infrastructure: libraries, coffee shops, schools, requirements to heat and cool homes, it is likely that energy providers will parks, social clubs, and other places where human bonding occurs. Social experience increased pressure to keep up with energy demand, especially infrastructure supports good social relations, one of the five components during extreme weather events. of human well-being. This is important to cultivate as a defense against the stress residents will experience in the face of more extreme and To help compensate for the adverse effects related to increased energy frequent weather events. By providing more spaces for people to socialize use, Bellevue can encourage and incentivize use of green energies. For and network, community members are also more likely to look out for example, the City could offer subsidies to developers and homeowners one another during times of crisis. Thus, communities can become more who install solar panels. resilient through their access to spaces where they come into close contact with one another.

To help compensate for the adverse effects related to increased energy use, Bellevue can encourage and incentivize use of green energies.

Students recommend the City of Bellevue incentivize homeowners to use solar panels and other Human Well-Being team members, Rawan Hasan, Mariko Kobayashi TERI THOMSON RANDALL renewable energy sources. TERRY COMBS

27 | LIVABLE CITY YEAR CLIMATE CHANGE | 28 URBAN FLOODING

common. More frequent storm events will compound with the city’s CLIMATE CHANGE EXACERBATES existing impervious surface coverage to overwhelm stormwater URBAN FLOODING IN BELLEVUE infrastructure. This will result in flooding of local waterways which could Described as a “City-in-a-Park,” Bellevue, Washington places high value devastate not only parks and open spaces but also key roadways, on its natural environment. Bellevue’s many parks and open spaces are businesses, and residential areas (Beekman 2018). central to the high quality of life enjoyed by residents. The City of Bellevue Urban growth is likely to intensify the adverse impacts of climate change Urban growth is takes pride in providing outstanding recreational opportunities through unless careful planning and appropriate mitigation measures are in place. its network of parks and streams. This is why protecting natural assets has The City can continue to preserve its parks and natural resources while likely to intensify guided the City in comprehensive planning. responding to population growth and accommodating new development. the adverse While the City of Bellevue seeks to protect its network of 2,700 acres Importantly, the City may view urban development and population growth impacts of climate of parks and open spaces, it also actively encourages large companies as important opportunities, rather than as threats. to expand in or re-locate within its city limits. Associated development, change unless along with the extension of the Sound Transit Link light rail network, will inevitably impact the City’s built and natural environments, including its careful planning parks and open spaces. and appropriate In addition to these urban development changes, more frequent and mitigation intense natural hazards associated with climate change will impact Bellevue’s parks. In particular, 100-year storms will become more measures are in place.

Students in a Hazard Mitigation Planning course visit Weowna Park accompanied by City of Bellevue Compounding effects of climate change and staff. The park encompasses 90 acres of open space and offers miles of trails through forested areas urban development could lead to increased alongside Lake Sammamish. TERI THOMSON RANDALL flooding and soil erosion in Weowna Park. KEVIN LOWE PELSTRING

29 | LIVABLE CITY YEAR CLIMATE CHANGE | 30 URBAN FLOODING SCENARIO PLANNING FRAMEWORK SCENARIO PLANNING Scenario planning is applied as a framework to imagine four possible futures for the City of Bellevue. Each scenario presented in this section considers flooding hazards in the context of climate change and urbanization. Specific attributes to measure these two drivers are listed below:

DRIVER: CLIMATE CHANGE Attribute: 24-hour storm events • Large increase in rainfall events representing 24-hour storm events with >1 inch of rainfall with 3+ events each year • Moderate increases in rainfall, with 24-hour storm events occurring 1-2 times each year

DRIVER: URBANIZATION Attribute: Impervious surface coverage • Lower coverage, equal to current impervious surface coverage of 42% • Higher coverage, greater than 50% of current impervious surface coverage

HELEN STANTON AND LIZA HIGBEE-ROBINSON

Members of the Urban Flooding Team during their final presentation, from left to right: Kevin Lowe Pelstring, Cate Kraska, Bob Freitag (course instructor, in background), and Helen Stanton. TERI THOMSON RANDALL

31 | LIVABLE CITY YEAR CLIMATE CHANGE | 32 SCENARIO 1: GREATEST INCREASE IN FREQUENCY SCENARIO 3: LESS INCREASE IN FREQUENCY OF LARGE STORM EVENTS AND INCREASED OF LARGE STORM EVENTS AND MAINTAINED IMPERVIOUS SURFACE COVERAGE IMPERVIOUS SURFACE COVERAGE In this scenario, the impacts of climate change have arrived quickly and This scenario impacts the city least of all, as current impervious surface produced more frequent and intense 24-hour storm events. Rapid coverage is maintained or reduced while intense rainfall events progress urban growth, as a result of the Sound Transit Link light rail extension less rapidly, with only one or two major storms occurring each year. and growth in the business sector have contributed to an increase in While some flooding occurs, most impacts have been mitigated by an impervious surface coverage, to above 50% of the city’s total land area. improved stormwater management system and by implementing low This is a worst-case scenario, with features of the built environment impact development (LID) features, like pervious surfaces which allow contributing to extensive adverse impacts which further compound with water to be absorbed by the earth. As a result of LID, which integrates the effects of intense rainfall resultant from climate change. Bellevue with natural systems, it is uncommon for flooding to impact roads. Thus, becomes subject to destructive and persistent flooding. In the winter, it in this scenario, school and work days are almost never affected by severe is very common for parks to regularly flood, and most are overgrown and weather events and parks remain in use during all months of the year. unused for half the year. Roads are also prone to flooding, which disrupts Strategic stormwater design and management prevent flooding from school and work days. As a result, the economy struggles, becoming wreaking havoc throughout the city. reactive to erratic seasons. Several large flooding events every year can grind the city to a halt for days. Increased flooding also brings more pollutants into the waterways, threatening keystone species like salmon SCENARIO 4: GREAT INCREASE IN LARGE STORM and native flora. Flooding leads to streambank erosion, permanently EVENTS AND MAINTAINED IMPERVIOUS SURFACE reshaping the parks and open spaces of the area. COVERAGE In this scenario, although substantial urban growth has occurred, stricter planning regulations lead to maintained impervious surface coverage SCENARIO 2: MODERATE INCREASE IN (i.e., approximately 42%). This helps mitigate the most intense effects of FREQUENCY OF LARGE STORM EVENTS AND flooding. Heavy 24-hour periods of rainfall have become very common, INCREASED IMPERVIOUS SURFACE COVERAGE but the impacts of storms vary. At times, severe flooding of roadways In this scenario, while expected growth still results in an increase in forces businesses and schools to close. In many cases, only the lowest impervious surfaces, climate change impacts are modest and occur drainages of the city are affected by storms, and the city continues gradually. to operate as normal. The stormwater management system is always teetering on the edge of failure during winter months, but it typically While the changes do place increased pressure on stormwater facilities, withstands weather events thanks to recent, strategic planning and the levels are manageable as a result of infrastructure improvements infrastructure improvements. Parks are subject to flooding during winter made possible by drawing from state and federal funding sources. months and put to greater use during the summertime, with residents Occasionally, after particularly intense storms, flooded roadways disrupt taking full advantage of the shade provided by tree canopies on hot days. school and work days. However, this occurs infrequently and economic effects are minimal. Parks experience increased flooding, but they are carefully maintained to accommodate the impacts of water retention without disrupting public use of them. Water regularly pools in parts of the city where drainage is particularly poor and where impervious surfaces are prevalent, like the downtown area. Overall, the city maintains normal operations and manages the effects of climate change.

33 | LIVABLE CITY YEAR CLIMATE CHANGE | 34 STRATEGIES Bellevue is currently considering several mitigation strategies for flooding The City can offer grants or subsidies to help cover the cost of a full as outlined in the City’s Comprehensive Plan as well as in the City of retrofit or consider waiving property or certain utility taxes for a period Bellevue Stormwater Management Guide (2015). However, there are of time if property owners consent to make changes themselves (Freitag opportunities for the City to build upon existing climate change-influenced 2011). Another option is to apply land easements or to purchase strategies. Strategies may involve accommodation, protection, or retreat redevelopment rights for impervious parcels, requiring owners to retrofit techniques, and may be combined with specific planning, policymaking, impervious surfaces to improve their land’s stormwater management and enforcement procedures. The City can apply for grant funding to capacity (Freitag 2011). With regard to more vulnerable properties, cover associated costs. The three strategies discussed in this section are directly proximate to flood-prone areas, the City could strategically based on Bellevue’s current conditions and anticipated urban growth. acquire the properties and designate them as part of a natural flood path (Freitag 2011). 1. Retrofitting Aging Development Aging infrastructure contributes to Bellevue’s high levels of impervious surface coverage and vulnerability to more severe and frequent flooding events. This includes the supportive infrastructures of private single-family homes, as well as commercial properties, such as shopping centers and parking lots. These portions of the built environment were developed before the City imposed development restrictions on impervious surface coverage in December of 2016. Addressing Bellevue’s current impervious surface coverage is especially important for the City to manage scenarios in which population increases beyond expected projections and the frequency of severe storms and flooding also increases. Several opportunities may exist for the City to incentivize property owners to retrofit or redevelop lands to increase pervious surface coverage and, therefore, flooding-resilience.

Aging infrastructure contributes to Bellevue’s high levels of impervious surface coverage and vulnerability to more severe and frequent flooding events.

Dillenbough Creek floods I-5 in Chehalis, Washington.US GEOLOGICAL SURVEY

35 | LIVABLE CITY YEAR CLIMATE CHANGE | 36 2. Low Impact Development (LID) Bellevue already requires implementation of LID for some new Low impact development (LID) involves stormwater management facilities development and redevelopment projects and has adopted Washington and infrastructural features and designs which reduce stormwater State Department of Ecology’s 2012 Stormwater Management Manual runoff and improve water quality. LID methods, which support water for Western Washington. These efforts will help the City of Bellevue infiltration, filtration, storage, evaporation, detention, and retention, can offset impacts associated with urban growth, like increased impervious achieve restoring hydrological functions to pre-development conditions surface coverage. Another way to implement LID broadly is by creating (Washington State Department of Ecology 2012). Many LID technologies improvement districts. These are essentially neighborhoods which integrate with natural systems, improving the aesthetics of a place while decide on an approach (e.g., SEA Streets) to redeveloping their roads and also reducing impervious surface coverage. LID can also reduce costs sidewalks that incorporates LID strategies. Loans or grants issued by the associated with maintaining pavement, detention basins, and pipe local government can help cover associated costs. After covering initial networks (Washington State Department of Ecology 2012). Examples of redevelopment costs, the City of Bellevue would recapture the value of LID features include bioswales, permeable paving, green roofs, and rain loans through higher returns on property taxes over a period of time gardens. Seattle’s Street Edge Alternatives Project (SEA Streets) is one (Freitag 2011). Benefits to the community would include a more livable example of successful LID implementation and road redesign (Matsuno, neighborhood. Care would need to be taken to avoid displacement of et. al. 2001). The design combines traditional drainage infrastructure with current residents as a result of increased property values and rent costs. newer technologies, like bioswales, to enhance the natural landscape visually and functionally. It reduces the site’s total volume of stormwater runoff by 99% (Matsuno, et. al. 2001). LID strategies can help mitigate consequences of increased impervious surface coverage in Bellevue and reduce the effects of increased frequency and intensity of rainfall events, as described previously. Integration of natural elements with LID projects also reinforces Bellevue’s “City-in-a-park” motto.

Integration of natural elements with low impact development projects reinforces Bellevue’s “city-in-a-park” motto.

LID strategies can help reduce the effects of more frequent and intense rainfall events. AARON VOLKENING

37 | LIVABLE CITY YEAR CLIMATE CHANGE | 38 3. Park Redesign 4. Onsite Detention in Up-Zoned Areas By redesigning parks, potential damage to recreational sites from One approach for accommodating greater urban density while also in- increased frequency and intensity of storms can be mitigated. Flooding, in creasing permeability is the use of onsite water detention and retention. Park redesign particular, can be managed by designing and installing features to capture Onsite detention could include underground storage that allows water represents a or redirect water. This can be done in a way that is aesthetically pleasing to travel via drainage or rain catchment systems (Federal Highway Ad- and ecologically sound. The intent would be to make the additional water ministration n.d.). As a burgeoning design concept, Bellevue could easily strategic, large- from winter storms work for the City of Bellevue, rather than against it. become a model for other cities by adopting such an approach. It is likely that Bellevue will experience both more frequent and intense scale investment Parks in Bellevue are often flooded during the winter, discouraging park rainfall events and urban growth over the next few decades, so a plan to to accommodate use and socialization. Redesign of parks will not completely change their accommodate both, like onsite detention and retention, is key to en- character, but will instead support the natural collection and flow of water suring the city’s resilience. By investing in infrastructure that accounts future storm and account for increased water quantity as a result of more frequent for the effects of increased storm events and urbanization, the City will events and and intense storms. Park redesign represents a strategic, large-scale save money in the long-term. Additionally, onsite water detention can be investment to accommodate future storm events and maintain the utility viewed as a conservation measure which reduces pressure on stormwa- maintain the utility and desirability of parks for residents and visitors of Bellevue. ter systems during times of inundation and which also guards against the Funding for flood mitigation could be drawn from grants sourced from consequences of extended periods of drought, also more likely to occur and desirability of the Federal Emergency Management Agency (FEMA). Inspiration for in the future (Federal Highway Administration n.d.). This approach can be parks for residents park redesign could be drawn locally from public input and design applied to the redesign of existing developments, especially in parts of competitions, as well as from international examples, including Bellevue experiencing growth. To encourage developers to incorporate and visitors of Chulalongkorn University Centenary Park in Bangkok, Thailand. There, these designs in their plans, the City could offer subsidies or change zon- SEA Streets is an example of low impact development practiced in Seattle. Bellevue. by retrofitting an 11-acre central park the sequestration of power from ing regulations to permit denser development (Freitag 2011). NATIONAL ASSOCIATION OF CITY nearly one million gallons of water during a flooding event is made TRANSPORTATION OFFICIALS possible (Garfield 2018). Another promising example to learn from is Hans Tavsens Park in Copenhagen, Denmark, where the installation of retention ponds and greenways enables up to 18,000 cubic meters of water to be held (Mairs 2016). By investing in infrastructure that accounts for the effects of increased storm events and urbanization, the City will save money in the long-term.

Chulalongkorn University Centenary Park in Bangkok, Thailand, was redesigned to handle storm events. BUNBN

39 | LIVABLE CITY YEAR CLIMATE CHANGE | 40 URBAN TREE CANOPY

CLIMATE CHANGE THREATENS BELLEVUE’S EXISTING URBAN TREE BELLEVUE’S POTENTIAL URBAN TREE CANOPY CANOPY To meet its 40% BELLEVUE’S URBAN TREE CANOPY target for total This section focuses on climate change as it will impact urban tree canopy (UTC) within the context of a growing Bellevue. The climate change tree canopy driver looks at how four distinct scenarios stress or threaten the city’s UTC and how this will affect Bellevue and its residents. The urbanization coverage, the City driver follows expected growth in targeted areas as growth interacts of Bellevue will with varying degrees of severity of climate change. We outline Bellevue’s current UTC, explain why trees matter in an urban environment, review need to invest in potential impacts of each climate change/urban growth scenario, and planting 670 acres outline strategies and recommendations for the City to consider. In view of anticipated hotter temperatures and heat waves induced by climate of trees. change, Bellevue’s urban tree canopy will play an even more vital role as a source of cooling for residents. This is particularly the case as the city also becomes denser. The second driver reflects an objective stated by the City of Bellevue in its Comprehensive Plan, to maintain its single-family character, overall, while accommodating growth in designated, up-zoned areas. We do not foresee a future Bellevue that does not experience some degree of pressure to increase density which means it is important to consider population growth in all planning processes.

UTC IMPORTANCE AND STRESSORS PLAN-IT GEO PLAN-IT GEO Since 1986, the City of Bellevue has conducted a tree canopy assessment every 10 years (City of Bellevue 2017). In the City’s first assessment, Currently, of the estimated 1.4 million trees in Bellevue, 65% are located published three decades ago, the City reported its tree canopy to on suburban residential properties, and 20% are located in parks and cover 40% of Bellevue’s total land area. Reports published before 2007 open spaces (Plan-It Geo 2018). To meet the City’s 40% target for total demonstrate a decline in total tree coverage, from 40% in 1999 to 37% tree canopy coverage, the City will need to invest in planting an additional in 2007, for example (Pappas 2018). As a result of this trend, Bellevue’s 670 acres of trees (Pappas 2018). Currently, 28% of Bellevue’s total land City Council passed a goal to increase tree canopy coverage to 40% in area is suitable for trees; this includes some areas which are covered with Bellevue’s Comprehensive Plan (City of Bellevue 2015). impervious surfaces, like parking lots, as well as areas covered by other In recent years, tree canopy coverage decline has leveled off. The City’s vegetation (Plan-It Geo 2018). The remaining 35% of the city is not suit- 2017 report measured 37% tree canopy coverage, demonstrating no able for planting trees; this includes spaces that have already been built further decline since the 2007 report (City of Bellevue 2017). Of four up with buildings, roads, and parking lots, as well as areas with bare soil categories used to classify tree health — where class one indicates and dry vegetation (Plan-It Geo 2018). excellent health and class four indicates poor health — 72% of Bellevue’s UTC is labeled class one or class two (Plan-It Geo 2018).

41 | LIVABLE CITY YEAR CLIMATE CHANGE | 42 Since being recognized as “Tree City USA” by the national Arbor Day Foun- dation more than two decades ago, the City of Bellevue has maintained URBAN TREE CANOPY BENEFITS a steady focus on the importance of maintaining its UTC. People and wildlife of Bellevue, as well as the whole region, depend on the ecosystem There is great potential for the City to increase overall tree health services provided by a robust tree canopy. Climate change is expected while also expanding the total percentage of its tree canopy to both amplify the effects of existing weather events, like heavy rainfall, coverage. However, increasing UTC may be a more important focus severe windstorms, and extreme cold spells; and also introduce new than that of improving tree health due to the innumerable benefits stressors, like heat waves and sustained periods of drought. The following of UTC, listed below. four scenarios reflect the range of climate change projections and gesture Economic: Bellevue’s UTC saves the City $39 million in pollution toward potentialities that the City can plan and prepare for now. mitigation, sequesters $51 million worth of carbon, and obviates $2.8 million in infrastructure development and maintenance (Plan-It Geo 2018). Planting and maintaining trees improves aesthetics and URBAN TREE CANOPY FAST FACTS engenders sense of place, qualities linked to higher property values (Enelow 2015). Trees improve water quality and reduce stormwater runoff, reducing costs associated with retaining and treating water. One of the biggest benefits of UTC for cities is the cooling effect of tree canopies. The shade offered by trees makes cities more livable through periods of sustained heat, and may contribute to reducing need to emit greenhouse gasses to cool indoor spaces (Enelow 2015). Ecological: In the Pacific Northwest, tree canopy coverage contributes to stream health, required by Pacific salmon (a keystone species). Trees also prevent soil erosion, reduce runoff, and promote biodiversity (US Forest Service 2018). Abundant trees remove great quantities of pollutants from the air which helps cities like Bellevue meet federal air quality standards (US Forest Service 2018). Social: Lastly, urban tree canopy increases social capital. Trees as associated with places like parks, patios, and plazas which provide places for people to gather in urban settings. Trees are also linked to improved psychological and cognitive functions (Holtan et al. 2014).

People and wildlife of Bellevue, as well as the whole region, depend on the ecosystem services provided by a PLAN-IT GEO robust tree canopy.

43 | LIVABLE CITY YEAR CLIMATE CHANGE | 44 SCENARIO PLANNING URBAN TREE CANOPY SCENARIO PLANNING FRAMEWORK As before, scenario planning is applied as a framework to imagine four possible futures for the City of Bellevue. Each scenario considers urban tree canopy in view of attributes of two drivers: climate change and urbanization. Nearly all climate change models predict increased precipitation in the northern third of North America and decreased precipitation in the southern third. However, Bellevue and the Pacific Northwest fall in an in-between space. This results in a greater degree of uncertainty about our region’s future. For example, individual models predict changes in annual precipitation that range from a -10% decrease to a +20% increase by 2080. Because the City now anticipates a certain amount of population growth and urban density within targeted areas of Bellevue, our urbanization driver compares current population with a substantial increase in population.

DRIVER: CLIMATE CHANGE Attribute: Urban tree canopy (UTC) stressors induced by climate change • Lower stressors, with UTC self-organizing/adapting to stressors • Higher stressors, with UTC collapsing

DRIVER: URBANIZATION Attribute: Increased urban density in targeted up-zoned areas with infill in single-family neighborhoods • Moderate levels of density in targeted areas and infill within single-family neighborhoods • Accelerated levels of density in targeted areas and infill within single-family neighborhoods

HELEN STANTON AND LIZA HIGBEE-ROBINSON

45 | LIVABLE CITY YEAR CLIMATE CHANGE | 46 SCENARIO 1: GREAT INCREASE IN CLIMATE SCENARIO 3: MODERATE INCREASE IN CLIMATE STRESSORS AND SUBSTANTIAL POPULATION STRESSORS AND MODERATE POPULATION GROWTH GROWTH In the first scenario, summers in Bellevue have quickly become much The third scenario accounts for less population growth and for gradual, hotter and drier, while winters have become shorter, warmer, and modest climatic change. Summers are hotter and drier and winters are wetter. Increased wildfires in California have triggered migration to the slightly wetter and warmer. These changes put some new pressures Puget Sound region and Bellevue’s population has spiked. The physical on the city’s urban tree canopy. With less population growth, less tree removal of trees to make room for housing and other urban services and removal occurs. With maintained levels of UTC and minimal effects of the stress of sudden environmental change cause a reduction of total climate change, stormwater management is possible, properties retain tree canopy. As a result of swift environmental change, even the more their values, and the economy remains stable. The city avoids the worst resilient trees struggle to reproduce. The tree canopy becomes sparse. impacts of climate change and its UTC flourishes. Over time, the residents of Bellevue can access only a few shaded parks. Community ties and residents’ attachment to communal spaces decline. Wildlife, like birds and squirrels, which rely on trees, begin to disappear. SCENARIO 4: GREAT INCREASE IN CLIMATE Eventually, ecosystem benefits of cleaner air and water retention are STRESSORS AND MODERATE POPULATION no longer provided by trees, and the urban heat island effect becomes GROWTH routine. Soon, property values plummet and energy demands soar, as a In the fourth scenario, population growth occurs slowly and the effects result of far greater need to cool buildings. With decreased precipitation of climate change are rapid and drastic. The residents of Bellevue in summer months and shorter winters, the reservoirs the city relied upon experience hotter summers with regular heat waves, and short, warmer in the past are not replenished and water shortages become a threat. winters with intense periods of rainfall. These impacts impede the rate However, some opportunities may arise. Gaps in the tree canopy of urban growth and disrupt plans to complete the Sound Transit Link could allow for the most resilient and adaptable species to survive and light rail extension. As extreme weather patterns persist, Bellevue’s eventually replace other species. A reduction in overall annual stormwater UTC struggles to adapt. Substantial die-off of native trees ensues. With runoff would also reduce the burden placed on Bellevue’s stormwater increased rainfall in the winter and with fewer trees, there are fewer management system. opportunities for people to gather outside and socialize. With fewer trees to retain water, stormwater runoff carries contaminants into streams, degrading stream health and threatening salmon populations. SCENARIO 2: MODERATE INCREASE IN CLIMATE Stormwater facilities throughout the city become overwhelmed and costs STRESSORS AND SUBSTANTIAL POPULATION to treat and store water soon become a burden. Increased flooding GROWTH damages roads and buildings, and residents lose access to outdoor The second scenario includes both increased population and increased recreational spaces. Property values throughout the city decline, reflecting presence of climate stressors, but changes in precipitation and a crippled economy. temperatures are more moderate than in the first scenario. These factors lead to a reduction in total tree canopy. Trees are removed to make room for new housing. Gradual environmental change causes less resilient species to die. Despite these challenges, opportunities abound to increase community awareness about the importance of the many ecosystem services provided by urban trees. Additionally, slightly wetter winters yield opportunities to introduce new tree species which may be better adapted to the altered climatic conditions.

47 | LIVABLE CITY YEAR CLIMATE CHANGE | 48 CLIMATE CHANGE DRIVEN TREE One of the most visible factors linked to tree stress and mortality are pest and pathogen infestations. While mild to moderate infestations are MORTALITY normal, large scale, year after year infestations tend to occur when trees In all four scenarios, in order to respond to stressors incurred, Bellevue are stressed over a prolonged period and when conditions particularly needs to assess risks and threats to its UTC and build resiliency however encourage pest proliferation (Raffa, et al. 2008). These could be wet or possible. Research and understandings related to how climate change dry conditions, depending on the pest. Increased frequency of severe During drought affects tree canopy is rapidly developing. However, most resources weather events in the Pacific Northwest will encourage pest proliferation focus on wildland tree canopies, especially of tropical and subtropical and trigger tree death. It is important to note that proximity to a global periods, trees may environments, and not on urban tree canopies. The latter are more port (e.g., nearby Port of Seattle and Port of Tacoma) is correlated with an lose their ability susceptible to environmental change because they do not exist in pristine increase in importation of exotic pests (Gulick 2014). conditions. Urban conditions are also associated with higher carbon Another significant concern is wildfire. By midcentury, lands at risk of to transport water dioxide levels, hotter temperatures, and greater nitrogen deposition experiencing wildfire in the northwest are projected to increase by 200- to their leaves, than natural forest ecosystems (O’Brien, Ettinger, and HilleRisLambers 300% of their historic records (Halofsky and Peterson 2016). The majority 2012). These qualities of urban environments allude to reasons trees are of forest fires start in wildlands (79%) and spread through the wildland which prevents particularly important for making them livable. urban interface (WUI), where wild spaces and urban spaces merge (Ager, them from To understand how to mitigate the effects of climate change on urban Day, Short, and Evers 2016). While wildfires in the WUI have yet to be a tree canopy, we should first understand tree mortality and how it problem for western Washington, climate change and increased urban photosynthesizing intersects with climate. The primary factor which incites or accelerates development will exacerbate risks of wildfires occurring in the WUI. Such and causes them tree vulnerability and decline is heat, with drought often compounding wildfires could be devastating as a result of the substantial amount of with the effects of increased temperatures (van Mantgem, et al. 2009; fuel for fires present in semi-urbanized and suburban developments to starve to death. Whyte, Howard, Hardy, and Burgess 2016). Predicting which trees will (Holdeman 2017; Keeton,W.S, Mote, P.W, and Franklin, J.F 2007; Radeloff, be affected by heat and drought remains challenging because concepts et al. 2018). of tree mortality are not advanced enough to predict regional die-off patterns (Allen, et al. 2010; McDowell, et al. 2008). Tree mortality may occur gradually, with periods of growth, stress, and recovery. The primary PROJECTED PLANTING ZONE CHANGES IN NEXT 30 YEARS cause of tree mortality during drought periods stems from trees losing the ability to transport water to their leaves (McDowell et al. 2008). This prevents them from photosynthesizing, causing their carbon reserves to decline (Allen et al. 2010; van Mantgem et al. 2009. Ultimately, drought causes trees to starve to death. Drought resilience in trees tends to be inherited. The Pacific Decadal Oscillation (PDO) is a long-term fluctuation of the Pacific Ocean. It causes alternating long periods of wet and dry conditions along the west coast of the US. This phenomenon inhibits native trees from passing on drought tolerance and predisposes them to water stress (McDowell et al. 2008). One native tree of concern is Douglas-fir (Pseudotsuga menziesii), with a current range extending from Canada to Mexico. Douglas-fir populations found in Mexico and in the southern United States appear to be less affected by dry summers, suggesting that assisted species migration of drought resilient subspecies could help other regions maintain Douglas-fir throughout the tree’s traditional native range (Chen, Welsh, and Hamann 2010). NOAA

49 | LIVABLE CITY YEAR CLIMATE CHANGE | 50 STRATEGIES AND RECOMMENDATIONS 2. Share Knowledge and Research Bellevue possesses significant institutional knowledge about its urban Given the significant role trees play in urban settings and the potential tree canopy and is already investigating ways to adapt to climate change. threats to Bellevue’s urban tree canopy, it is urgent that the City take action Unfortunately, many of the City’s strategies are not well documented or to protect its trees now and in the future. All measures and strategies must available to the public. The City could organize a group whose purpose is be carefully considered to avoid creating new risks to UTC. to gather and share knowledge on tree canopy stressors resultant from 1. Comprehensive Tree Inventory both climate change and urbanization. Knowledge generated by this group could be used to develop planting mitigation strategies. The group A comprehensive tree inventory involves accounting for all tree species could share resources and build a knowledge base to benefit tree canopy found throughout Bellevue. In scenarios with increased pressure on UTC, managers across the region. In forming such a group, the City of Bellevue the host-specific nature of tree pests and diseases, susceptibility to fire, and could partner with the University Washington’s School of Environmental varying urban conditions, all loom as substantial threats. Together they point and Forest Sciences and other environmental research groups interested to the need for a comprehensive tree inventory to understand and mitigate in sharing information related to tree canopy stressors and mitigation tree mortality risks (Gulick 2014). strategies. Documenting experimental projects and existing knowledge While complete ground inventories are typically cost-prohibitive, windshield legitimizes projects and justifies reproducing or expanding successful surveys (rough observational surveys conducted from within cars) can be strategies, while also making space for recognizing and understanding used to identify trees based on their unique characteristics (e.g., flower failed techniques. Cumulatively, this augments institutional knowledge color, bark, fall color). Remote sensing and aerial imaging can also be used to and enables urban foresters to hone their skills. identify target features (Gulick 2014). These methods are quickly becoming more sophisticated and accessible. A less traditional approach to monitoring urban tree populations is to crowdsource information by providing each tree with an email address linked to an identification number; this is already HARDINESS ZONES AND CLIMATE CHANGE practiced in Melbourne, Australia (LaFrance 2015). These email addresses A hardiness zone is a geographic region where specific plant life is could easily link to imaging software and give forest managers feedback on capable of growing. The United States Department of Agriculture which trees are stressed or requiring maintenance. This would enable them (USDA)’s cold hardiness zones, which are determined based on to focus their efforts broadly to support tree resilience and ensure trees average annual absolute minimum temperatures, are shifting quickly continue to provide a range of ecosystem services. (Parker and Abatzoglou 2016). Bellevue is currently designated as belonging to zone 8b; by 2050, the city is expected to become reclassified as zone 9. As the city and broader region face climate change, plants adapted to zones 8b, 9, and 10 should be included in planting designs. To ensure that future plantings are viable and Increased frequency of severe weather reflective of Pacific Northwest ecology, a variety of tree planting lists events in the Pacific Northwest will can be generated and used by public and private institutions, as well as residents. Lists can be derived from restoration ecology’s Kuchler encourage pest proliferation and zones, which focus on regional plant communities. By ensuring information on trees is publicly available and easy to access, trigger tree death. community members will be more likely to support tree planting initiatives.

51 | LIVABLE CITY YEAR CLIMATE CHANGE | 52 3. Assisted Species Migration 4. Wildland Fire Mitigation Another way to protect species with wide geographical ranges is through Another way to protect species with wide geographical ranges is assisted species migration. This would involve identifying and introduc- through assisted species migration. This would involve identifying and ing trees that grow in areas with climates similar to expected future introducing trees that grow in areas with climates similar to expected conditions. In theory, those species would be capable of withstanding or future conditions. In theory, those species would be capable of thriving in future conditions. Assisted species migration could be accom- withstanding or thriving in future conditions. Assisted species migration plished by partnering with climate and forest research organizations, such could be accomplished by partnering with climate and forest research as the UW’s School of Environmental and Forest Sciences. Native plant organizations, such as the UW’s School of Environmental and Forest nurseries may serve as sources for trees adapted to different climat- Sciences. Native plant nurseries may serve as sources for trees adapted ic conditions which could be transplanted in Bellevue and elsewhere to different climatic conditions which could be transplanted in Bellevue throughout the Puget Sound region. Because introduced species can and elsewhere throughout the Puget Sound region. Because introduced impact and even disrupt ecological systems, it is important that the City species can impact and even disrupt ecological systems, it is important work with experts to manage the introduction of new species. that the City work with experts to manage the introduction of new NATIONAL FIRE PROTECTION ASSOCIATION species. In the scenario characterized by rapid effects of climate change and accelerated urban development, threats posed by fires in the wildland urban interface (WUI) are significant. There are, fortunately, several strategies to prevent fire from impacting UTC:

1. The City can begin planning and updating FireWise, an educational program that teaches people to adapt to living in areas prone to wildfires. 2. The City can avoid planting flammable species (those with a high oil content and those that dry out in the summer months) and remove invasive species like English ivy (Hedera helix), which is oily and acts as a ladder fuel. 3. The City can simulate burns using mechanical thinning. This prevents fires from spreading. Simulated burns also mitigate the dispersal of pests and help maintain a balanced plant community.

Because many of these strategies require significant labor, we suggest that the City of Bellevue’s Parks and Community Services department expand its volunteer activities to include shorter-term options, rather than year-long commitments. Many of these strategies could be incorporated into partnerships with the UW’s School of Environmental and Forest Sciences and help the City protect and enhance UTC and Bellevue’s “City- in-a-Park” aesthetic at less cost.

By assisting in the migration of Douglas fir found in southern United States, the iconic tree may continue to live throughout its historic range. PATTE DAVID, US FISH AND WILDLIFE SERVICE

53 | LIVABLE CITY YEAR CLIMATE CHANGE | 54 CONCLUSION

The City of Bellevue is changing, as is the environment that sustains These recommendations emerged from three reports completed over its rich network of parks and open spaces. In view of climate change the course of one academic quarter by graduate students enrolled in a and projected population growth, the opportunity looms to reimagine Hazard Mitigation Planning course at the University of Washington. Each urban planning and align development practices with natural systems topic requires further investigation and investment. More time should which support human well-being and livability.It is essential that the City be devoted to flushing out ideas and to exploring potential solutions. By consider how it can generate climate resilience while also accommodating combining various mitigation strategies, Bellevue can build resilience and urban growth. The stakes are high, as climate change will not only stress face the compounding effects of climate change and urbanization. To Bellevue’s built environment and threaten its urban tree canopy, but cultivate equity and resilience, the City can dedicate resources to further also physically and emotionally stress the residents of Bellevue. The study and develop an action plan to include and expand on many of our approaches and tools recommended in this report respond to likely recommendations. scenarios, set in the future. Each of the focused sections offers starting points for the City to consider mitigation strategies and solutions, including:

• Providing access to shelters for people in need of refuge • Increasing access to medical care • Incentivizing renewable energy opportunities • Promoting and dispersing mixed-use social infrastructures • Retrofitting aging development • Expanding the use of low impact development • Redesigning parks • Installing onsite water detention features in up-zoned areas • Creating a comprehensive tree inventory • Establishing a regional urban tree canopy climate stressors research organization • Facilitating assisted species migration • Improving wildland fire mitigation and adaptation

In the face of climate change and increased urbanization, Bellevue’s parks will help pave the way toward a livable future. JOE MABEL In view of climate change and projected population growth, the opportunity looms to reimagine urban planning and align development practices with natural systems which support human well-being and livability.

55 | LIVABLE CITY YEAR CLIMATE CHANGE | 56 REFERENCES

Human Well-Being County, Wahsington, 1990-2010.” Reviews on Environmental Bolton, Debra. Relationships Matter: You and Social Capital. Accessed on April 11, 2019. Health. Vol 30, Issue 1. (2015): 51-64. https://search-proquest- https://www.bookstore.ksre.ksu.edu/pubs/mf2992.pdf com.offcampus.lib.washington.edu/docview/1661325560?rfr_ id=info%3Axri%2Fsid%3Aprimo City of Bellevue. “Bellevue’s Comprehensive Plan: 12 Human Services.” Accessed on March 9, 2019.http://cobgis.maps.arcgis.com/apps/MapSeries/index. Jackson, J. Elizabeth, et al. “Public Health Impacts of Climate Change in html?appid=6b17a256e0a94991b40029f35c204cf8 Washington State: Projected Mortality Risks Due to Heat Events and Air Pollution.” Climatic Change, vol. 102, no. 1-2, 2010, pp. City of Bellevue. “Bellevue’s Comprehensive Plan: 3 Land Use.” Accessed on March 9, 2019. 159–186., doi:10.1007/s10584-010-9852-3. https://bellevuewa.gov/UserFiles/Servers/Server_4779004/File/pdf/PCD/03_Land_ Use_FINAL_20150727.pdf Klinenberg, Eric. “Inside the Box.” Contexts, vol. 1, no. 3, 2002, pp. 56–57., doi:10.1525/ctx.2002.1.3.56. City of Bellevue. “ Age Diversity”. Accessed on March 20, 2019. https://bellevuewa.gov/city- government/departments/community-development/data/demographic-data/age- H. Chung, Jack Chen, Jeremy Avise, Roger A. Rosenblatt, and Richard A. diversity Fenske. “Public health impacts of climate change in Washington State: projected mortality risks due to heat events and air City of Bellevue 2013 Comprehensive Emergency Plan CEMP. Accessed https://fire. pollution.” Climatic Change. Vol 102, Issue 1-2. (2010): 159-186. bellevuewa.gov/UserFiles/Servers/Server_4779004/File/Fire/OEM/CEMP_ https://link-springer-com.offcampus.lib.washington.edu/content/ Annexes_2013.pdf pdf/10.1007%2Fs10584-010-9852-3.pdf City of Bellevue. “Core Values.” Adopted on September 1999. https://bellevuewa.gov/ Kretschmer, Marlene, Coumou, Dim, Agel, Laurie, Barlow, Matthew, UserFiles/Servers/Server_4779004/File/pdf/Manager/Mission_Vision_Core_Values.pdf Tziperman, Eli, and Cohen, Judah. “More-Persistent Weak City of Bellevue. “Population Trends.” Accessed on March 9, 2019. https://bellevuewa.gov/ Stratospheric Polar Vortex States Linked to Cold Extremes. cms/One.aspx?portalId=4779088&pageId=14906831 January 2018. https://journals.ametsoc.org/doi/abs/10.1175/ Climate and Health Assessment. “Populations of Concern.” U.S. Global Change Research BAMS-D-16- 0259.1 Program. Accessed March 12, 2019. https://health2016.globalchange.gov/ Lee, Jessica. “Light-rail ridership soars in year after UW, Capitol Hill populations-concern stations open.” The Seattle Times. March 18, 2017. https://www. Climate Impact Group. “Climate Impacts in Brief” College of Environment, University of seattletimes.com/seattle-news/transportation/light-rail-ridership- Washington, Accessed on April 10, 2019. https://cig.uw.edu/learn/climate-impacts-in- soars-in-year-after-uw-capitol-hill-stations-open/ brief/ Levy, Nat. “Seattle is the nation’s fastest growing tech hub, study says, Enzmann, D.R., Beauchamp, N.J., & Norbash, A., (2011) Scenario Planning, Journal of the as Bay Area engineering centers continue to expand.” Geek American College of Radiology, 8(3), 175-179 Wire. October 29, 2018. https://www.geekwire.com/2018/ seattle-nations-fastest-growing-tech-hub-study-says-bay-area- Giorgi, Filippo, and Linda O. Mearns. “Calculation of Average, Uncertainty Range, and engineering-centers-continue-expand/ Reliability of Regional Climate Changes from AOGCM Simulations via the ‘Reliability Ensemble Averaging’ (REA) Method.” Journal of Climate, vol. 15, no. 10, 2002, pp. Millennium Ecosystem Assessment. “Ecosystems and Human Well- 1141–1158., doi:10.1175/1520-0442(2002)0152.0.co;2. being: Synthesis” Accessed May 22, 2019. https://www. millenniumassessment.org/documents/document.356.aspx.pdf Gunnarsson-Östling, U., & Höjer, M., (2011) Scenatio Planning for Sustainability in Stockholm, Sweden: Environmental Justice Considerations, International Journal of Urban and OECD. “What is Social Capital?” Accessed April 11, 2019. https://www.oecd. Regional Research, 35(5), 1048-1067 org/insights/37966934.pdf Isaksen, Tania Busch, Michael G. Yost, Elizabeth K. Hom, You Ren, Hilary Lyons, and et. al., “Increased hospital admissions associated with extreme-heat exposure in King

57 | LIVABLE CITY YEAR CLIMATE CHANGE | 58 Peterson, G.D., Cumming, G.S., & Carpenter S.R., (2003) Scenario Planning: a Tool for Tetra Tech Inc., John Rath, Sujoy Roy, and Jon Butcher. CSO Reduction Conservation in an Uncertain World, Conservation Biology, 17(2), 358-366 Program. Intensity Duration Frequency Curves and Trends for the Sound Transit. “East Link Extension.” Accessed on March 9, 2019. https://www.soundtransit. City of Seattle: Technical Memorandum. Seattle Public Utilities. org/system-expansion/east-link-extensionhttps://www.soundtransit.org/system- December 29, 2017. http://climatechange.seattle.gov/wp-content/ expansion/east-link-extension uploads/2018/01/Seattle-IDF-Curve-Update-TM_12-29-2017.pdf. Sound Transit. “Eastside 2019 Regional Reports.” January 2019. https://www.soundtransit.org/ Hiroko Matsuno and Selina Chiu. Stormwater Management Challenge: sites/default/files/documents/regional-report-eastside-201901.pdf Street Edge Alternatives (SEA Streets). Seattle Public Utilities. Seattle, WA, 2001. https://nacto.org/docs/usdg/stormwater_ United States Global Change Research Program. “The Impacts of Climate Change on Human management_challenge_matsuno.pdf. Health in the United States: A Scientific Assessment. Accessed on April 14, 2019. https://health2016.globalchange.gov/ US Department of Transportation Federal Highway Administration. “Stormwater Best Management Practices in an Ultra-Urban Wilburn, K., (2001) Abbreviated Scenario Thinking, Business Horizons, 54(6), 541-550 Setting: Selection and Monitoring.” Environmental Review Toolkit, www.environment.fhwa.dot.gov/Env_topics/water/ultraurban_ Urban Flooding bmp_rpt/uubmp2.aspx#s222. Beekman, Daniel. “’Extreme’ Rainstorms Becoming More Common in Seattle, Says City Washington State Department of Ecology. Water Quality Program. Meteorologist.” The Seattle Times. February 03, 2018. Accessed April 20, 2019. Stormwater Management Manual for Western Washington. Vol. https://www.seattletimes.com/seattle-news/weather/extreme-rainstorms-becoming- 12-10-030. Olympia, WA: Washington State Dept. of Ecology, 2001. more-common-in-seattle-says-city-meteorologist/. City of Bellevue. Utilities Department. Stormwater Management Guide. WA: City of Bellevue, Urban Tree Canopy 2015. Ager, A. A., Day, M. A., Short, K. C., & Evers, C. R. (2016). Assessing the FEMA. “Flood Mitigation Assistance Grant Program.” Flood Mitigation Assistance Grant impacts of federal forest planning on wildfire risk mitigation in Program | FEMA.gov. Accessed April 21, 2019. https://www.fema.gov/flood-mitigation- the Pacific Northwest, USA. Landscape and Urban Planning, 147, assistance-grant-program. 1–17. https://doi.org/10.1016/j.landurbplan.2015.11.007 Freitag, Robert. “All Hazards Capabilities Assessment Tool”. Institute for Hazard Mitigation Allen, C. D., Macalady, A. K., Chenchouni, H., Bachelet, D., McDowell, N., Planning and Research, University of Washington. January 26, 2011. Vennetier, M., … Cobb, N. (2010). A global overview of drought and Garfield, Leanna. “Bangkok Is Sinking, so It Built a Park That Holds a Million Gallons of heat-induced tree mortality reveals emerging climate change risks Rainwater to Help Prevent Flooding.” Business Insider. August 01, 2018. Accessed for forests. Forest Ecology and Management, 259(4), 660–684. April 21, 2019. https://www.businessinsider.com/bangkok-park-holds-a-million- https://doi.org/10.1016/j.foreco.2009.09.001 gallons-of-rainwater-to-prevent-flooding-2018-7#-and-drains-into-a-large-retention- Bracewell R. R., Vanderpool D., Good J. M., & Six D. L. (2018). Cascading pond-that-soaks-it-up-6. speciation among mutualists and antagonists in a tree–beetle– Mairs, Jessica. “Chains of Pools Proposed to Ease Flooding in Copenhagen.” Dezeen. fungi interaction. Proceedings of the Royal Society B: Biological December 06, 2016. Accessed April 21, 2019. https://www.dezeen.com/2016/07/12/ Sciences, 285(1881), 20180694. https://doi.org/10.1098/ hans-tavsens-park-korsgade-sla-copenhagen-denmark-flooding-urban-planning/. rspb.2018.0694

59 | LIVABLE CITY YEAR CLIMATE CHANGE | 60 Buotte, P. C., Hicke, J. A., Preisler, H. K., Abatzoglou, J. T., Raffa, K. F., & Logan, J. A. (2017). Keeton, W.S, Mote, P.W, & Franklin, J.F. (2007). Climate variability, climate Recent and future climate suitability for whitebark pine mortality from mountain pine change, and western wildfire with implications for the urban- beetles varies across the western US. Forest Ecology and Management, 399, 132– wildland interface. Climate Impacts Group. Retrieved from https:// 142. https://doi.org/10.1016/j.foreco.2017.05.032 cig.uw.edu/news-and-events/publications/climate-variability- Chen, P.-Y., Welsh, C., & Hamann, A. (2010). Geographic variation in growth response of climate-change-and-western-wildfire-with-implications-for-the- Douglas-fir to interannual climate variability and projected climate change. Global urban-wildland-interface/ Change Biology,16(12), 3374–3385.https://doi.org/10.1111/j.1365-2486.2010.02166.x LaFrance, A. (2015, July 10). People Are Writing Thousands of Emails to City of Bellevue. (2017). Trees and Our City. Retrieved fromhttps://bellevuewa.gov/discover- Trees. Retrieved March 5, 2019, from https://www.theatlantic. bellevue/about-us/hot-topics-initiatives/trees-and-our-city com/technology/archive/2015/07/when-you-give-a-tree-an-email- address/398210/ Coops, N. C., & Waring, R. H. (2011). Estimating the vulnerability of fifteen tree species under changing climate in Northwest North America. Ecological Modelling, 222(13), 2119– Mar, A., & i. (2018, December 12). Preparing for Wildfire in Puget Sound. 2129. https://doi.org/10.1016/j.ecolmodel.2011.03.033 Retrieved March 20, 2019, from https://sustain.org/preparing-for- wildfire-in-puget-sound/ Davis, K. T., Dobrowski, S. Z., Higuera, P. E., Holden, Z. A., Veblen, T. T., Rother, M. T., … Maneta, M. P. (2019). Wildfires and climate change push low-elevation forests across a critical McDowell, N., Pockman, W. T., Allen, C. D., Breshears, D. D., Cobb, N., climate threshold for tree regeneration. Proceedings of the National Academy of Kolb, T., … Yepez, E. A. (2008). Mechanisms of plant survival and Sciences, 201815107. https://doi.org/10.1073/pnas.1815107116 mortality during drought: why do some plants survive while others succumb to drought? New Phytologist, 178(4), 719–739. https:// Enelow, N. (2015, November 10). Tree city: Creating prosperity for all. Retrieved from https:// doi.org/10.1111/j.1469-8137.2008.02436.x ecotrust.org/tree-city/ Mcintyma. (2018, June 1). Pear Trees: Rust, times 2. Retrieved March 20, Group, City of Redmond. (2015). Hazard Mitigation Plan: Wildfires Risk Assessment. City 2019, from http://blogs.oregonstate.edu/mgmetro/2018/06/01/ of Redmond. Retrieved from https://www.redmond.gov/common/pages/UserFile. pear-trees-rust-times-2/ aspx?fileId=19063 Mote, P.W. & Salathé, E.P. Future Climate Change in the Pacific Northwest. Gulick, J. (2014). Planning for Urban Forest Resilience: Managing Invasive Pests and Diseases. Climatic Change (2010) 102: 29. https://digital.lib.washington.edu/ PAS Memo, 14. researchworks/bitstream/handle/1773/34591/1.pdf Halofsky, J. E., & Peterson, D. L. (2016). Climate Change Vulnerabilities and Adaptation Options O’Brien, A. M., Ettinger, A. K., & HilleRisLambers, J. (2012). Conifer growth for Forest Vegetation Management in the Northwestern USA. Atmosphere, 7(3), 46. and reproduction in urban forest fragments: Predictors of future https://doi.org/10.3390/atmos7030046 responses to global change? Urban Ecosystems, 15(4), 879–891. Harker, Donald, Libby, Gary, Harker, Kay, Evans, Sherri, & Evans, Marc. (1999). Landscape https://doi.org/10.1007/s11252-012-0250-7 Restoration Handbook(Second). Lewis Publishers for CRC Press LLC. Pappas, E. (2018, October 12). Bellevue completes citywide tree canopy Holdeman, E. (2017, July 18). Western Washington not immune from wildfire risk. The Seattle assessment. Bellevue Reporter. Retrieved fromhttp://www. Times. Retrieved from https://www.seattletimes.com/opinion/western-washington- bellevuereporter.com/news/bellevue-completes-citywide-tree- not-immune-from-wildfire-risk/ canopy-assessment/ Holtan, M., Dieterlen, S., & Sullivan, W. (2014). Social Life Under Cover: Tree Canopy and Parker, L. E., & Abatzoglou, J. T. (2016). Projected changes in cold Social Capital in Baltimore, Maryland. Environment and Behavior,1-24. Retrieved from hardiness zones and suitable overwinter ranges of perennial http://willsull.net/resources/Sullivan-papers/HoltanDieterlenSullivan2014.pdf crops over the United States.Environmental Research Letters, 11(3), 034001. https://doi.org/10.1088/1748-9326/11/3/034001

61 | LIVABLE CITY YEAR CLIMATE CHANGE | 62 Radeloff, V. C., Helmers, D. P., Kramer, H. A., Mockrin, M. H., Alexandre, P. M., Bar-Massada, A., … Stewart, S. I. (2018). Rapid growth of the US wildland-urban interface raises wildfire risk. Proceedings of the National Academy of Sciences, 115(13), 3314–3319. https:// doi.org/10.1073/pnas.1718850115 Raffa, K. F., Aukema, B. H., Bentz, B. J., Carroll, A. L., Hicke, J. A., Turner, M. G., & Romme, W. H. (2008). Cross-scale Drivers of Natural Disturbances Prone to Anthropogenic Amplification: The Dynamics of Bark Beetle Eruptions. BioScience, 58(6), 501–517. https://doi.org/10.1641/B580607 Rayburg, S. (2018, October 25). Swinburne trials first smart urban forest management system. Retrieved March 6, 2019, from http://www.swinburne.edu.au/news/latest- news/2018/10/swinburne-trials-first-smart-urban-forest-management-system-.php Sailor, C. (2018, September 15). Some of Washington’s biggest trees are mysteriously dying | The Spokesman-Review. Tacoma News Tribune. Retrieved fromhttp://www. spokesman.com/stories/2018/sep/15/some-of-washingtons-biggest-trees-are- mysteriously/ US Forest Service. (2018, November 30). Urban Forestry. Retrieved fromhttps://www.fs.fed. us/psw/topics/urban_forestry/ Plan-It Geo. Tree Canopy Assessment (Rep.). (2018). Retrievedhttps://bellevuewa.gov/ UserFiles/Servers/Server_4779004/File/Planning%20and%20Community%20 Development/ESI/Bellevue%20WA%20-%20Full%20Tree%20Canopy%20 Assessment%20Report%20-%202018_FINAL-compressed%20-%20Copy.pdf Van Mantgem, P. J., Stephenson, N. L., Byrne, J. C., Daniels, L. D., Franklin, J. F., Fule, P. Z., … Veblen, T. T. (2009). Widespread Increase of Tree Mortality Rates in the Western United States. Science,323(5913), 521–524. https://doi.org/10.1126/science.1165000 Whyte, G., Howard, K., Hardy, G. E. S. J., & Burgess, T. I. (2016). The Tree Decline Recovery Seesaw; a conceptual model of the decline and recovery of drought stressed plantation trees. Forest Ecology and Management, 370, 102–113.https://doi. org/10.1016/j.foreco.2016.03.041(Coops & Waring, 2011)

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