Seismic Resilience of the Colorado River Aqueduct Casa Loma Siphon: A Century of Evolution
Publication: Lifelines 2022
ABSTRACT
The Casa Loma Siphon Barrel No. 1, as part of the Metropolitan Water District of Southern California’s (Metropolitan’s) Colorado River Aqueduct (CRA), is a 148-in. (3,759-mm) diameter concrete pipe that extends 5 miles and crosses the Casa Loma Fault Segment of the San Jacinto Fault Zone. This paper discusses the design, construction, repair, and seismic resilient design of this siphon over a time span of almost a century. Metropolitan’s strategy to improve the seismic resilience includes: (1) geologic and geotechnical investigations for the siphon at the crossing of the Casa Loma Fault; (2) development of seismic design criteria that meet Metropolitan’s performance objectives; (3) mitigation strategy and application of earthquake-resistant pipe joints; (4) modeling of pipeline and fault interaction; (5) development of detailed design; and (6) construction contract delivery and sequencing considerations. The retrofitted pipeline is anticipated to remain functional and operational during and following a design seismic event.
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Lifelines 2022
Pages: 369 - 380
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Published online: Nov 16, 2022
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