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Cascade Water Alliance’s 15th Anniversary Celebration
Bellevue, WA
May 15, 2014
Resiliency – Planning Individually and
as a Region for Tomorrow
Ray Hoffman
Director, Seattle Public Utilities
Overview
• Water Supply Forum’s resiliency work
• Seattle Public Utilities climate resiliency program
• Conclusions
Regional water system resiliency
project 2014-2015
• Investigate water system
vulnerabilities
• Identify solutions to regional risks
• Educate and communicate to build
support for solutions
Water system resiliency – limit
damage and recover quickly from
a disturbance
• Earthquakes
• Droughts
• Water quality
• Climate change
SPU’s climate program
Water Supply
Urban Drainage
Sea Level Rise
Carbon neutrality
Earthquake Scenario
N
• Estimated 1,000 pipeline
failures primarily in the
Duwamish Valley
W
E
S
Legend
• Scenario developed with
Water Research Foundation
Vulnerability Scale
Green - failure rate < 0.05
failures/1000ft
Light Blue - 0.05 < failure rate < 0.5
Dark Blue - 0.5 < failure rate < 1.5
Purple - 1.5 < failure rate < 2.0
Red - 2.0 failures/1000ft < failure rate
Primary Backbon e Pipe D iame te rs
Low Vu lnerab ility
Low to Mo derate Vulne ra bility
Mo de rate Vuln erability
Mo de rate to H igh Vuln era bility
High Vu lnerab ility
Se co nd ary Ba ckb one Vu lnerability
Low Vu lnerab ility
Low to Mo derate Vulne ra bility
Mo de rate Vuln erability
Mo de rate to H igh Vuln era bility
High Vu lnerab ility
Tertia ry D istribu tio n Vulne rab ility
Low Vu lnerab ility
Low to Mo derate Vulne ra bility
Mo de rate Vuln erability
Mo de rate to H igh Vuln era bility
High Vu lnerab ility
W ater Re se rvoirs
W ater Tanks
Tank
Stan dp ipe
City Lim its
Reg ion al W ater Bodie s
http://www.atmos.washington.edu/SPU/
All quantiles based on annual maximum series data.
City
(Station)
Precipitation (in) for Given Duration and Frequency
30-min
60-min
24-hr
25-yr
100-yr
25-yr
100-yr
25-yr
100-yr
Phoenix, 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
2.26
2.73
3.02
3.76
6.36
8.32
2.01
2.53
2.68
3.49
5.96
7.35
0.53
0.68
0.70
0.89
3.35
4.08
Columbia, SC (Columbia
WSFO AP)
Chattanooga, TN
(Chattanooga WSO AP)
*Seattle, WA (SeaTac Airport)
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
Mainstream Adaptation
Incorporate climate change into decision
making
Thank You