A DAPTATION L AND U SE P LANNING : G UIDANCE FOR M ARIN C OUNTY L - - PowerPoint PPT Presentation

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A DAPTATION L AND U SE P LANNING : G UIDANCE FOR M ARIN C OUNTY L - - PowerPoint PPT Presentation

May 18, 2023 366 likes •588 views

A DAPTATION L AND U SE P LANNING : G UIDANCE FOR M ARIN C OUNTY L OCAL G OVERNMENTS SLR = increased volume of seawater from thermal expansion + increased mass of water from melting land ice. 2008 IPCC Sea Level Rise Scenarios High = 3 ft 36

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ADAPTATION LAND USE PLANNING: GUIDANCE FOR MARIN COUNTY LOCAL GOVERNMENTS

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SLR = increased volume of seawater from thermal expansion + increased mass of water from melting land ice.

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2008 IPCC Sea Level Rise Scenarios

High = 3 ft (inches) 36 10

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2013 Sea Level Rise Scenarios for California

High = 5 Feet

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2017 Sea Level Rise Scenarios for California

High = 5 ft H++ = 10 ft

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Ma Marin C Cou

  • unty

ty already f y flood

  • ods
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What we did

  • Marin County led a project to

quantify the impacts to our communities and infrastructure from sea level rise and storms

  • Involved public and private

stakeholders and coordinated with all cities and towns, and with local, regional, and state agencies to understand how the impacts affect Marin

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Our Coast Our Future web viewer displaying 10 inches of sea level rise with the 100-year storm, which is comparable to our winter storms.

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What the Guidance provides Sea level rise overlay and policies Recommendations

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What the Guidance Provides

Case Studies Decision- Making Process SLR Overlay

Countywide Recommendations Unincorporated County Recommendations

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CASE STUDIES

  • ACQUISITIONS
  • TAXES
  • GHADS

Fee-Simple Lease-Back Program with additional funding sources Corte Madera Sales Tax Broad Beach Geological Hazard Abatement District (GHAD)

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Sample Adaptation Pathways for Tam Valley

  • Hwy 101 & 1

Bulkhead: Hold the Line

  • Bothin Marsh

Project: Restore and Elevate

  • SLR & Floodplain

Overlay

  • Retreat and/or

Acquisition

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TRANSFER

DP

SIGNAL

AT

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Tam Valley Sample Overlay

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Madeline Schaider Real Estate

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But where will they go? Out of the flood zone, into the fire zone I’m hungry What’s a TDR?

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SAMPLE OVERLAY POLICIES

  • Waiver of liability and assumption of risk
  • Restrictions on land divisions

 Acquisition program (further explore feasibility)  Encourage nature-based shoreline protection

  • Reasonable interim use of property

 Development standards: for adapting in place or new development

  • Allow additional building height for elevation projects
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RECOMMENDATIONS

  • Shared Impacts/ Local Government Coordination
  • Tax Program
  • Use Adaptation Pathways Approach
  • SLR Outreach and Education
  • Goals and Objectives from BayWAVE ESC
  • Adapt in Place Design
  • Series of Specific Countywide Plan Policy Updates
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Leslie Lacko • 415-473-4333 • llacko@marincounty.org