Sea Level Rise 2014 City Council Update
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Transcript of Sea Level Rise 2014 City Council Update
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Sea Level Rise2014 City Council Update
City of Olympia | Public Works, Water ResourcesMarch 2014
City of Olympia | Capital of Washington State
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Sea Level Rise in Olympia
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Existing Flooding Extents – 10-year event
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Protect downtown. Understand the implications of 50
inches of sea level rise.Use opportunities for new public
and private investments to prepare for sea rise.
Seek opportunities to maintain control of valuable shoreline.
City Policy - 2010
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International Panel on Climate ChangeNational Research Council
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Sea Level Trends
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Global Sea Level Rise Projections
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Processes influencing sea level Primary Processes
Thermal Expansion Melting Glaciers Melting Ice Sheets Terrestrial Storage
Additional Processes Weather Vertical Land Movement
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Sea Level Rise – Relative Contributions of the Various Processes
2081 - Assuming greenhouse gas stabilized near current levels
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Projected Flooding Extents – 0-feet sea level rise
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2013 IPCC Report Key Findings Global mean sea level rise will continue for many
centuries beyond 2100, with the amount of rise dependent on future emissions.
If Greenhouse gases are curbed, sea level rise will be less than 1 m by 2300.
If Greenhouse gases are not curbed, sea level rise may be up to 3 m by 2300.
Larger sea level rise could result from ice sheet flow.
Near-complete loss of the Greenland ice sheet will occur with warming of between 1°C and 4°C.
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Vertical Land MovementTectonics
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Vertical Land Movement Tectonics Glacial isostatic
adjustment
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Vertical Land Movement Monitoring Olympia’s elevations
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Importance of El Nino Events
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Importance of Weather
Fiddlehead Marine - December 17, 2012
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Tools for Predicting Tides Tides are predicted years in advance Atmospheric models forecast pressure weeks
in advance NOAA and Emergency Management
Organization Warnings Stream gages on the Deschutes River
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Tacoma NOAA Real Time Tide Data
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Flooding MechanismsInundation of Budd Inlet and Capitol Lake Shorelines
Pipe Backflow from Budd Inlet and Capitol Lake
Terrestrial Runoff
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Inundation of Budd Inlet and Capitol Lake Shorelines
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Inundation of Budd Inlet and Capitol Lake Shorelines
Oyster House - December 17, 2012…17.6 Foot Tide
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Inundation of Budd Inlet and Capitol Lake Shorelines
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Temporary Flood Barriers
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Temporary Flood Barriers - Locations
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Barrier Locations – 0.25 ft sea level rise
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Barrier Locations – 0.5 ft sea level riseand beyond
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Pipe Backflow Flooding
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Pipe Backflow Flooding
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Pipe Backflow Flooding
Budd Bay Cafe
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Pipe Backflow Flooding 112 known outfalls
to Capitol Lake and Budd Inlet within the city limits
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Pipe Backflow Flooding Of those piped
outfalls, 36 are susceptible to backflow flooding
20 City –owned 9 State-owned 5 Port-owned 2 Privately-owned
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Capitol Lake and East Bay
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Backflow Prevention Devices
Flap tide gates & Gate valve Pinch valve “duck bill”
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Terrestrial Runoff Flooding
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Inundation of Budd Inlet and Capitol Lake Shorelines
Capitol Lake
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2014 Work Plan TasksSurvey shoreline elevationsSurvey vulnerable structure elevations
Identify combined sewer catch basins vulnerable to flooding
Purchase temporary barriers and practice placement
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Additional Short-term TasksDesign strategic tide gatesModify drainage system for the
Capitol Lake to eliminate need to pump 20-acre basin
Investigate the permeability of downtown soils
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Medium-term Tasks (0.25 to 0.5 feet of sea level rise) Modify elevations of Heritage Park Install permanent flood barriers on western
shore of peninsula Consolidate peninsula drainage systems Disconnect flood-prone streets from the
Moxlie Creek drainage system Purchase pumps to handle downtown runoff
during high tides
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Long-term Tasks Raise barriers building on existing
foundations Construct pump stations for consolidated
drainage systems and Moxlie Creek.
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Eric ChristensenCity of Olympia360.570.3741
City of Olympia | Capital of Washington State