Appendix B Vulnerability Assessment
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Appendix B Vulnerability Assessment 135 136 Vulnerability Assessment Thurston Regional Planning Council December 2016 FINAL 0 137 This page is left blank intentionally. 1 138 Contributors Report Authors Michael Burnham, Associate Planner, TRPC Ben Silver, GIS Technician, TRPC Science Advisory Committee Lara Whitely Binder, Senior Strategist, University of Washington Climate Impacts Group Carrie Parr (Pucko), Professor of Biology and Environmental Studies, The Evergreen State College Chris Ellings, Salmon Recovery Program Manager, Nisqually Indian Tribe Candace Penn, Climate Change Specialist, Squaxin Island Tribe Morgan Greene, Program Coordinator, Nisqually River Council Other Technical Reviewers Eric Christensen, Water Resources Planning and Engineering Manager, City of Olympia Andrew Kinney, Emergency Management Coordinator, Thurston County Art Starry, Environmental Health Director, Thurston County Chris Hawkins, Community Engagement, Evidence and Partnerships Manager, Thurston County Project Team Michael Burnham, Associate Planner & Project Manager, TRPC Allison Osterberg, Senior Planner, Thurston County Veena Tabbutt, Interim Executive Director, TRPC Paul Brewster, Senior Planner, TRPC Scott Carte, GIS Coordinator Michael Ambrogi, Senior GIS Analyst, TRPC Ben Silver, GIS Technician Katrina Van Every, Associate Planner, TRPC Acknowledgments The Thurston Regional Planning Council (TRPC) prepared this report, which assesses how human and natural systems within Thurston County’s Puget Sound-draining watersheds are vulnerable to climate change, as part of the Thurston Climate Adaptation Plan. The ongoing planning effort is funded by a U.S. Environmental Protection Agency National Estuary Program grant (#: 15-63401-001), which is being administered by the Washington Department of Commerce. For more information, please visit www.trpc.org/climate. 2 139 This page is left blank intentionally. 3 140 Table of Contents 1. Executive Summary ....................................................................................................................... 6 1.1 Approach ................................................................................................................................... 6 1.2 Scenarios & Models ................................................................................................................... 7 1.3 Spatial Analysis .......................................................................................................................... 8 1.4 Organization .............................................................................................................................. 9 1.5 Summary Findings ................................................................................................................... 10 2. Troposphere ................................................................................................................................ 15 2.1 Air Temperature ...................................................................................................................... 15 Annual Changes ................................................................................................................ 15 Seasonal Changes.............................................................................................................. 16 Daily Changes .................................................................................................................... 16 2.2 Air Quality ................................................................................................................................ 22 2.3 Precipitation ............................................................................................................................ 23 Annual & Seasonal Changes .............................................................................................. 23 Storm Frequency & Intensity ............................................................................................ 26 Snowfall & Snowpack Volume .......................................................................................... 29 3. Freshwater Ecosystems ............................................................................................................... 32 3.1 Streams .................................................................................................................................... 32 Water Volume Vulnerability ............................................................................................. 32 Hydropower Vulnerability................................................................................................. 36 Water Temperature & Salmonid Vulnerability ................................................................. 38 Water Quality Vulnerability .............................................................................................. 43 3.2 Lakes ........................................................................................................................................ 45 Water Temperature & Quality Vulnerability .................................................................... 45 3.3 Wetlands .................................................................................................................................. 47 3.4 Groundwater ........................................................................................................................... 49 Saltwater Intrusion & Inundation Vulnerability ................................................................ 49 Pathogen & Pollution Contamination Vulnerability ......................................................... 51 4 141 Water Quantity Vulnerability ............................................................................................ 53 4. Marine Ecosystems ...................................................................................................................... 54 4.1 Sea-Level Rise .......................................................................................................................... 54 Coastal Infrastructure Vulnerability .................................................................................. 54 Coastal Species Vulnerability ............................................................................................ 63 4.2 Ocean Acidification & Pollution .............................................................................................. 65 5. Terrestrial Ecosystems .................................................................................................................. 67 5.1 Farms & Ranches ..................................................................................................................... 67 Drought & Flood Vulnerability .......................................................................................... 67 Crop & Livestock Vulnerability .......................................................................................... 67 5.2 Forests & Prairies .................................................................................................................... 70 Prairie Species Vulnerability ............................................................................................. 70 Forest Species Vulnerability .............................................................................................. 71 6. Human Health & Welfare ............................................................................................................. 73 6.1 Wildfires .................................................................................................................................. 73 6.2 Floods & Landslides ................................................................................................................. 78 Flood Vulnerability ............................................................................................................ 78 Landslide Vulnerability ...................................................................................................... 80 6.3 Diseases & Other Health Threats ............................................................................................ 84 Tribal Vulnerability ............................................................................................................ 85 Assessing Adaptive Capacity ............................................................................................. 86 6.4 Population Displacement ........................................................................................................ 88 7. Next Steps.................................................................................................................................... 90 7.1 Overview of Plan Components ............................................................................................... 90 8. Appendix ..................................................................................................................................... 91 8.1 References ............................................................................................................................... 91 8.2 Explanation of Figures ............................................................................................................. 99 8.3 Reference Map ...................................................................................................................... 101 5 142 1: Executive Summary 1.1: Approach The Thurston Climate Adaptation Plan’s vulnerability