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HomeMy WebLinkAboutCMP Forum June 25, 2012 - Part 2_201401231628426545Adapting to Higher Tides & Storm Surges on Nantucket Julia Knisel Coastal Shoreline & Floodplain Manager Massachusetts Office of Coastal Zone Management Shorelines & Rates of Change Flood Hazard Zones Hurricane Surge Inundation Areas coastal inundation flooding storm surge Sea-Level Rise Factor erosion Nantucket Tide Station •Mean range (MHW-MLW) = 3.03 ft •Record = 1965-2006 •Sea level change = 0.97 ft in 100 yrs Tide Levels: Normal Tide Levels: Normal + 2 ft flooding of the most vulnerable shore roads and/or basements Tide Levels: Winter Storm (1 ft surge) Tide Levels: Winter Storm + 2 ft widespread flooding of vulnerable shore roads and/or basements Inundation of Critical Facilities Management Actions •Planning: comprehensive strategies to prevent growth in hazardous areas •Regulations & Development Standards: zoning ordinances •Mitigation and Shore Protection: dune restoration •Infrastructure: design & siting of critical facilities •Emergency Services: disaster response & recovery •Education & Outreach: hazard awareness StormSmart Coasts (2008) www.mass.gov/czm/stormsmart Hazard Mitigation migrate nourish elevate connect Climate Adaptation retreat protect accommodate Protect: Seawall Repair Protect: Beneficial Reuse Protect: Nourishment Accommodate: Elevate Buildings & Utilities Accommodate: Building Design Accommodate: Road Clearing Retreat: Reduce Services Retreat: Relocate Buildings Retreat: Remove Buildings Adaptation Principles •Broad-based participation •Best available science & technology •Strong leadership •Coordination of efforts •Cost-effective & risk- based approaches mass.gov/environment/cca Nantucket Regional Rates (m/yr): •LT avg = -0.67 ± 0.08 •LT max = -6.8 ±1.5 •ST avg = -0.79 ± 0.41 •ST max = -11.7 ± 10.8