eric christensen, sea level rise, budd inlet
TRANSCRIPT
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Sea Level Rise
in Budd Inlet
South Sound Science SymposiumSeptember 20, 2016
City of Olympia | Capital of Washington State
March 10, 2016 - 17.6 Foot Tide
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Olympia’s Setting
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Climate Change and SLR in Olympia
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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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Sea Level Fluctuations
Global Warming Art project
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Post-Glacial Sea Level Rise
Global Warming Art project
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Sea Level Trends
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IPCC Sea Level Rise Scenarios
IPCC 5th Assessment Report (2013)
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Other Sea Level Rise Scenarios
GlobalChange.gov
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Sea Level Rise Commitment Beyond 2100
• Carbon emissions through 2015 have committed us to 4 feet of sea level rise.
• Waiting until 2020 to start reducing emissions commits us to almost 8 feet of sea level rise.
• Maintaining current carbon emissions through 2100 commits us to 23 feet of sea level rise.
• Even with climate change limited to 2OC by tough emissions cuts (Paris Agreement), sea levels would rise 16 feet by 2500 and >80 feet by 4015.
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Downtown Olympia appears to be subsiding 0.9 in/decade
Vertical Land Movement
http://www.panga.cwu.edu
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Flooding is Periodic
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Importance of El Nino events
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Atmospheric Pressure
NOAA Tacoma real time gage
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Key Infrastructure
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Current 1% Flood Zone
Elevation 14 feet NAVD88 18 feet MLLW
Affected 55 acres 46 properties 80 buildings 1.7 road miles 122 catch basins
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6-inch Sea Level Rise - 1% Flood
Elevation 14.5 feet
NAVD88 18.5 feet MLLW
Affected 108 acres 106 properties 138 buildings 4.1 road miles 161 catch basins
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1-foot Sea Level Rise - 1% Flood
Elevation 15 feet NAVD88 19 feet MLLW
Affected 163 acres 188 properties 196 buildings 5.9 road miles 195 catch basins
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2-feet Sea Level Rise - 1% Flood
Elevation 16 feet NAVD88 20 feet MLLW
Affected 252 acres 290 properties 269 buildings 8.9 road miles 231 catch basins
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4-feet Sea Level Rise - 1% Flood
Elevation 18 feet NAVD88 22 feet MLLW
Affected 368 acres 387 properties 330 buildings 11.4 road miles 269 catch basins
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8-feet Sea Level Rise - 1% Flood
Elevation 22 feet NAVD88 26 feet MLLW
Affected 534 acres 586 properties 419 buildings 16.4 road miles 309 catch basins
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Shoreline Ownership
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Adapting/Protecting
• Elevated/ flood-proofed buildings
• Storm drainage modifications
• Flood barriers
• Elevated landscapes
• Flood walls
• Elevated roadways
• Downtown regrade
• Retreat
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Elevated/ Flood-proofed Buildings
New Buildings Existing Buildings
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Storm Drainage System
Backflow flooding at Budd Bay Cafe
Stormwater Outfalls
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Storm Drainage System
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Storm Drainage SystemStorm Drainage System
GREEN SPACE/ TREATMENTOF STORMWATER
DRAINAGE SYSTEMIMPROVEMENTS
DRAINAGE CANAL
PUMP STATION
OUTFALL
USACE
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Flood Barriers
Add consolidation map here
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Elevate Landscapes
Heritage Park
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Planter Box Flood Barriers
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Flood Walls
USACE
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Elevated Roadways
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Downtown Regrade
Seattle Pioneer Square Regrade
Olympia Fill
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Retreat
USACE
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Sea Level Rise in Budd Inlet
City of Olympia | Capital of Washington State
Eric Christensen
Water Resources Engineering and Planning Manager (360) 570-3741, [email protected]