Collaboration: Sea-level Marin Adaptation Response Team (C-SMART)

Transcription

1 Collaboration: Sea-level Marin Adaptation Response Team (C-SMART) Photo Credit : Lighthawk Aerial 3501 Civic Center Drive, Rm. 308 San Rafael, CA T Marin County Board of Supervisors 2/27/18

2 Workshop Objectives Phase I Completion: o Accept Marin Ocean Coast Sea Level Rise Vulnerability Assessment and Adaptation Report Phase II Commencement: o Receive overview of Phase II Work Program o Adopt Resolution for Nature Based Green Infrastructure Project Slide 2

3 C-SMART (Collaboration Sea Level Marin Adaptation Response Team) Slide 3

4 Public Workshops! 1.KICKOFF JULY 2014 POINT REYES NATIONAL SEASHORE 2.VULNERABILITY ASSESSMENT OCTOBER 2014 INVERNESS, STINSON BEACH AND TOMALES 3.GAME OF FLOODS MAY AND JUNE 2015, POINT REYES STN. AND STINSON BEACH 4.ADAPTATION POLLING NOVEMBER 2015, STINSON BEACH 5.NEXT STEPS JUNE 2017 POINT REYES STN. AND STINSON BEACH Slide 4

5 Five Scenarios: 10 + ANNUAL STORM YEAR STORM YEAR STORM YEAR STORM YEAR STORM Exposure Sensitivity V Adaptive Capacity Slide 5

6 Adaptation Report Informational document compiling adaptation options proposed to date Next steps to carry forward potential options Non regulatory, not a plan Slide 6

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8 Community Options? $44 million/km $30 million/km $5.5 million/km $37 million/km $500,000/acre $200,000/acre $250/ft 2 $20,000/acre $.5 4 million Slide 8

9 Passport Options NUMBER OF HIGH VOTES Homeowners Guide to Sea Level Rise 58 Consider SLR in Capital Improvement Projects 58 Community Plans for Adapting to Coastal Hazards 48 Interagency SLR Task Force 43 Home Retrofitting Options Guidance 39 Land Use/Zoning/Legal Evaluation 37 Sonoma/Marin County Sediment Management Working Group 36 Marin Countywide Plan Update w/slr 33 Subcommittee to Prioritize C SMART Next Steps 31 Citizen Science Monitoring Program 23 High School SLR Program 23 Slide 9

10 Homeowners Guide to SLR Maps o FEMA and future SLR Hazard Zones o Appeal zones, beaches, wetlands, streams, ESHA s, etc. Site scale mitigation strategies (Elevation, floodproofing, flood gates, etc.) o Cost estimates o FEMA Compliance o LCP Compliance County permitting processes/requirements Distribute via public workshops, online, and hard copies Slide 10

11 Adaptation Toolkit and Capital Improvement Plan IN TANDEM WITH BAYWAVE Adaptation Toolkit Evaluate land use planning, zoning and legal frameworks for addressing sea level rise o Legal requirements o Marin County adaptation planning o Tools review ordinances, buildings codes, zoning overlays, zoning strategies, rolling easements, fees and acquisition strategies, tax and other financial incentives, managed retreat strategies, other legal adaptation measures Draft Capital Improvement Guidance for the County to evaluate sea level rise in short, medium, and long term scenarios Slide 11

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13 Community Plan for Adapting to Coastal Hazards East Shore 1) Convene Planning Engagement Group 2) Local Businesses 3) Detailed Vulnerabilities Narrative 4) Public Workshop 1) Trigger Points 2) Major Concerns 5) Funding Memo 6) Next Steps Slide 13

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20 Stinson Beach Strategies Raise Homes (89 structures in V Zone ) = $29 M o Norishment would also be required for beach to maintain ecological/recreation function at 2060/2090 = $22 M total Beach and Dune Nourishment = $44 M over long term Revetment Extension = $24 M (additional nourishment would be required) Cobble Berm = $55 M per mile Slide 20

21 Community Plan for Adapting to Coastal Hazards Stinson Beach 1) Convene Planning Engagement Group 2) Vulnerabilities and Trigger Points 1) Detailed Vulnerabilities Narrative NUISANCE vs CHRONIC flooding 2) Public Kick off Workshop 3) Summarize vulnerabilities and trigger points 3) Nature Based Adaptation Feasibility Study 4) Accommodation and Protection 1) Feasibility Study (Hard Engineering / Structural Elevation) 2) Funding Memo / Local Assessment District 3) Community workshops (matrix and funding memo) 5) Draft and Finalize Plan for Adapting to Coastal Hazards Slide 21

22 THANK YOU! Photo Credit : Lighthawk Aerial 3501 Civic Center Drive, Rm. 308 San Rafael, CA T Marin County Board of Supervisors 2/27/18