|
Event
AEG Oregon Chapter- September Meeting
Abstract:
Located at Washington Park in the West Hills above downtown Portland, Oregon, Reservoirs No. 3 and 4 have supplied drinking water for the City of Portland since their construction in 1893 1894. Beginning in 2016, the Portland Water Bureau embarked on a multi-year project to improve the reliability and seismic resiliency of the Citys water storage west of the Willamette River. Key elements of the project include construction of a new, buried reservoir to replace the existing Reservoir No. 3, and conversion of Reservoir No. 4 into a storm water management facility. This presentation explores the unique history of infrastructure development in Washington Park, describes major civil works required to construct the new buried reservoir, and discusses a major design challenge accommodating a large, ancient landslide that has impacted the facility since its original construction.
The Portland Water Bureau had operated the two open drinking water reservoirs (Reservoir 3 and Reservoir 4) as part of a gravity-fed water system constructed during the 1890s. A large ancient landslide was re-activated during construction and movement rates were measured up to several inches per week. The landslide is approximately 1,700 feet long and 1,100 feet wide with an average depth of about 100 feet. Structural options to stabilize the landslide were not cost effective, as seismic displacements were difficult to tolerate with rigid solutions. Instead, the new reservoir is located just outside of the actively moving ground, adjacent to the landslide toe. The reservoir will be isolated from continued landslide movements using an innovative compressible inclusion. The performance of the landslide during construction, a key design consideration, will also be discussed.
Speaker Biography:
Tom Westover is a Senior Associate Engineer with Cornforth Consultants in Portland, Oregon. His geotechnical engineering experience in the Pacific Northwest and beyond includes high-capacity ground anchors, soil-structure interactions, landslide and rockfall analysis, transportation projects, and dam safety evaluation and modifications. His main interest involves using 3D modeling, data visualization, custom numerical models, and creativity to develop novel, efficient, risk-based solutions for complex geotechnical problems.
|
|
 |
LocationOld Market Pub (View)
6959 SW Multnomah Blvd.
Portland, OR 97223
United States
Timezone: America/Los_Angeles Online Access Information You will be provided instructions to access the digital content for this event. When and how these instructions are delivered to you is determined by the Event Organizer. To ensure access, use an up-to-date email address and avoid unsubscribing from email updates. See our Help Center for more information.
Categories
Contact
| Owner: Oregon AEG |
| On BPT Since: Nov 06, 2016 |
| |
| AEG Oregon |
|
|
