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February 25, 2019 COUNTY OF VENTURA RESOURCE MANAGEMENT AGENCY | PLANNING DIVISION DRAFT February 25, 2019 This page was intentionally left blank. DRAFT County of Ventura February 25, 2019 VC Resilient Coastal Adaptation Project Draft Adaptation Strategies Report DRAFT County of Ventura Resource Management Agency - Planning Division 800 South Victoria Ave Ventura, CA 93009 Acknowledgements ACKNOWLEDGEMENTS This report was prepared by the following individuals: County of Ventura • Tricia Maier, Long-Range Planning Manager • Aaron Engstrom, Senior Planner • Abigail Convey, Planning Biologist • Angela Kim, CivicSpark Climate Fellow • Lynn Socha, CivicSpark Climate Fellow Revell Coastal, LLC • David L. Revell, PhD, Project Director • Phil King, PhD, Lead Economist • Matt Jamieson, MFA, GIS Analyst and Coastal Scientist • Jeffrey Giliam, Economist The sea level rise models used to compile this report were developed by the following organizations: 2012 Coastal Resilience Ventura Model: • The Nature Conservancy, California Chapter • County of Ventura • Environmental Science Associates (ESA) 2017 Coastal Storm Modeling System (CoSMoS v3.0): • United States GeologicalDRAFT Survey • California Coastal Conservancy County of Ventura February 25, 2019 VC Resilient Coastal Adaptation Project i Draft Adaptation Strategies Report Contents CONTENTS Figure ACKNOWLEDGEMENTS ...................................................................................................................... i ACRONYMS/ABBREVIATIONS ............................................................................................................ iv DEFINITIONS ...................................................................................................................................... v REPORT, MAP, AND DATA DISCLAIMER ............................................................................................ vii EXECUTIVE SUMMARY .................................................................................................................. ES-1 1. INTRODUCTION ......................................................................................................................... ES-1 1.1 Advanced Planning for Sea Level Rise ...................................................................................... ES-1 1.2 Report Goals and Deliverables ................................................................................................. ES-2 1.3 Adaptation Planning Guidance ................................................................................................ ES-3 2. EXISTING SETTING AND POTENTIAL IMPACTS ................................................................................. 2-1 2.1 North Coast ................................................................................................................................ 2-3 Existing Conditions and Community Narrative .................................................................................. 2-3 Summary of Vulnerabilities ................................................................................................................ 2-5 Services into the Future ..................................................................................................................... 2-7 2.2 Central Coast .............................................................................................................................. 2-9 Existing Conditions and Community Narrative .................................................................................. 2-9 Summary of Vulnerabilities .............................................................................................................. 2-10 Services into the Future ................................................................................................................... 2-15 2.3 South Coast ................................DRAFT.............................................................................................. 2-17 Existing Conditions and Community Narrative ................................................................................ 2-17 Summary of Vulnerabilities .............................................................................................................. 2-19 Services into the Future ................................................................................................................... 2-25 3. Adaptation Planning .......................................................................................................................... 3-1 Maladaptation .................................................................................................................................... 3-3 Challenges .......................................................................................................................................... 3-4 Protect, Accommodate, and Retreat: The Approaches to Coastal Adaptation ................................. 3-5 3.1 Adaptation Strategies for County of Ventura ............................................................................ 3-6 County-Wide Adaptation Strategies .................................................................................................. 3-6 North Coast ...................................................................................................................................... 3-18 Central Coast .................................................................................................................................... 3-22 County of Ventura February 25, 2019 VC Resilient Coastal Adaptation Project ii Draft Adaptation Strategies Report Contents South Coast ...................................................................................................................................... 3-27 3.2 Adaptation Pathways ............................................................................................................... 3-31 Adaptation Pathway Case Studies ................................................................................................... 3-32 APPENDIX A. NATURAL RESOURCES ADAPTATION MATRIX ................................................................. A-1 APPENDIX B. ECONOMIC ANALYSIS of ADAPTATION STRATEGY CASE STUDIES ................................ B-1 B.1 Native Dune Construction ................................................................................................................ B-1 Costs ................................................................................................................................................... B-3 Benefits .............................................................................................................................................. B-3 Hollywood Beach ............................................................................................................................... B-6 Silverstrand Beach.............................................................................................................................. B-7 Summary ............................................................................................................................................ B-9 B.2 Stormwater System Improvements ................................................................................................. B-9 B.3 Replacement of the Revetment with a Seawall at Hobson and Faria County Parks, and Along the Rincon Parkway .................................................................................................................................... B-11 Recreational Benefits of a Seawall Increasing Beach Width ............................................................ B-13 Summary .......................................................................................................................................... B-14 B.4 Sediment Retention through Cobble-Based Groins at Hobson and Faria County Parks, and the Rincon Parkway ................................................................................................................................................ B-15 Potential Pilot Project ...................................................................................................................... B-15 Project Benefits ................................................................................................................................ B-17 B.5 Limitations of the Study ................................................................................................................. B-17 B.6 Conclusion ................................DRAFT...................................................................................................... B-18 County of Ventura February 25, 2019 VC Resilient Coastal Adaptation Project iii Draft Adaptation Strategies Report Acronyms/Abbreviations ACRONYMS/ABBREVIATIONS BEACON Beach Erosion Authority for Clean Oceans and Nourishment Coastal Resilience Coastal Resilience Ventura Project (The Nature Conservancy, County of Model Ventura, and Environmental Science Associates, 2012) CoSMoS Coastal Storm Modeling System of the United States Geologic Survey County County of Ventura FEMA Federal Emergency Management Agency LCP Local Coastal Program OPC Ocean Protection Council Report 2019 VC Resilient Coastal Adaptation Project Sea Level Rise Adaptation Strategies Report SLR Sea Level Rise USFWS United States Fish and Wildlife Service DRAFT County of Ventura February 25, 2019 VC Resilient Coastal Adaptation Project iv Draft Adaptation Strategies
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