Earthquake Response, Vulnerability Assessment, and Rehabilitation of Water Conveyance Tunnels in High Seismic Hazard Regions: Whitewater Tunnel No. 2 Seismic Resilience Study
Publication: Lifelines 2022
ABSTRACT
The Metropolitan Water District of Southern California (Metropolitan) owns and operates an extensive conveyance, storage, treatment, and distribution system, which provides water to approximately 19 million people over a 5,200 square mile service area. Metropolitan’s Colorado River Aqueduct (CRA) conveys on average approximately 25% of its service area annual demand. As part of its seismic resilience strategy to evaluate the overall seismic risk of its water delivery system, Metropolitan has conducted studies to assess the seismic vulnerability from a Moment Magnitude (Mw) 7.8 earthquake on the Southern San Andreas Fault, estimate the potential damage to the CRA, and assess the potential impacts to water delivery. This paper describes the methodology utilized in the risk assessment, development of performance criteria, structural evaluation, pre-earthquake mitigation, and post-earthquake restoration strategies for the existing Whitewater Tunnel No. 2 based on anticipated damage from a Mw7.8 SSAF earthquake that ruptures through the tunnel.
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Lifelines 2022
Pages: 356 - 368
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Published online: Nov 16, 2022
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