Vulnerability Assessment of Portland Water System in an M9 Cascadia Subduction Zone Earthquake
Publication: Lifelines 2022
ABSTRACT
The City of Portland’s water system is the largest in the state of Oregon covering an area of approximately 225 square miles and serving almost one-quarter of the population of the state. The water system services 165 pressure zones and has over 2,000 miles of pipelines, two major dams, 38 pump stations, 59 distribution system tanks, and 10 terminal storage reservoirs. Some of the oldest components of the system are over 100 years old. In 2009 dollars, the replacement value of the system was estimated to be $6.7 billion. A comprehensive seismic study of the Portland’s water system was completed to assess its performance in an M9 earthquake on the Cascadia Subduction Zone. A long-term system improvement plan was developed to meet the stated recovery goals in the Oregon Resilience Plan, a plan developed under the direction of Oregon House of Representatives to protect lives and maintain economic activity following an M9 earthquake.
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Lifelines 2022
Pages: 448 - 455
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Published online: Nov 16, 2022
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