Resiliency – Planning Individually and as a Region for Tomorrow
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Resiliency – Planning Individually and as a Region for Tomorrow
Ray HoffmanDirector, Seattle Public Utilities
Cascade Water Alliance’s 15th Anniversary CelebrationBellevue, WAMay 15, 2014
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Overview Water Supply Forum’s resiliency workSeattle Public Utilities climate resiliency programConclusions
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Regional water system resiliency project 2014-2015
• Investigate water system vulnerabilities
• Identify solutions to regional risks
• Educate and communicate to build support for solutions
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Water system resiliency – limit damage and recover quickly from a disturbance
• Earthquakes
• Droughts
• Water quality
• Climate change
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SPU’s climate program
Urban Drainage
Water Supply
Sea Level Rise
Carbon neutrality
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Regional Water BodiesCity Limits
Water TanksTankStandpipe
Water Reservoirs
Tertiary Distribution VulnerabilityLow VulnerabilityLow to Moderate VulnerabilityModerate VulnerabilityModerate to High VulnerabilityHigh Vulnerability
Secondary Backbone VulnerabilityLow VulnerabilityLow to Moderate VulnerabilityModerate VulnerabilityModerate to High VulnerabilityHigh Vulnerability
Primary Backbone Pipe DiametersLow VulnerabilityLow to Moderate VulnerabilityModerate VulnerabilityModerate to High VulnerabilityHigh Vulnerability
Legend
N
EW
S
Vulnerability ScaleGreen - failure rate < 0.05 failures/1000ftLight Blue - 0.05 < failure rate < 0.5Dark Blue - 0.5 < failure rate < 1.5Purple - 1.5 < failure rate < 2.0Red - 2.0 failures/1000ft < failure rate
Earthquake Scenario
• Estimated 1,000 pipeline failures primarily in the Duwamish Valley
• Scenario developed with Water Research Foundation
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http://www.atmos.washington.edu/SPU/
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All quantiles based on annual maximum series data.
City(Station) 25-yr 100-yr 25-yr 100-yr 25-yr 100-yrPhoenix, AZ (Phoenix City)
1.25 1.61 1.55 2.00 2.66 3.41
Chicago, IL (Chicago WB City 2)
1.89 2.30 2.45 3.07 5.41 7.16
Newark, NJ (Newark WSO Airport)
1.74 2.06 2.30 2.83 6.18 8.34
Columbia, SC (Columbia WSFO AP)
2.26 2.73 3.02 3.76 6.36 8.32
Chattanooga, TN (Chattanooga WSO AP) 2.01 2.53 2.68 3.49 5.96 7.35
*Seattle, WA (Sea-Tac Airport) 0.53 0.68 0.70 0.89 3.35 4.08
Precipitation (in) for Given Duration and Frequency30-min 60-min 24-hr
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event Met desc. Max precip duration USGS landslide threshold
N cso % 2011 CSO events
CSO volume
% 2011 CSO volume
21 Jan FROPA 1.60” 6hrs 20% 25 10% 11,178,562 15%
09 Mar FROPA 0.21” 10min 17% 38 15% 14,051,868 19%
14 Mar FROPA 0.77” 3hrs 134% 18 7% 18,279,670 25%
23 Nov AR 3.47” 48hrs 0% 28 11% 12,066,139 17%
4 significant events
109 42% 45,576,239 76%
2011 total 261 73,086,686
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Mainstream Adaptation
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Incorporate climate change into decision making
Thank You