Resource

Replacing a Siphon with a Low-Level Delivery Conduit on a Soft Compressible Foundation

Resource Type
ASDSO Conference Papers
Reference Title
Replacing a Siphon with a Low-Level Delivery Conduit on a Soft Compressible Foundation
Author/Presenter
Horrocks, Brandon
Price, Jacob
Harper, McKay
Barrett, Bruce
Organization/Agency
Association of State Dam Safety Officials
Publisher Name
Association of State Dam Safety Officials
Year
2023
Date
September 17-21, 2023
Event Name
Dam Safety 2023
Event Location
Palm Springs, California
ASDSO Session Title
Session 27: Outlet Works
Topic Location
Session 27: Outlet Works
Abstract/Additional Information

The Weber Basin Water Conservancy District (WBWCD) operates a siphon near the southwest corner of the A.V. Watkins Dam, which is 14.5-mile long earth embankment, with a maximum height of 36 ft, that impounds the250,000 ac-ft Willard Bay Reservoir. The dam was constructed near the eastern shore of the Great Salt Lake onsoft to firm lacustrine clay soils interbedded with alluvial and beach sand deposits.

A new low-level conduit was designed to be constructed while retaining approximately 95,000 ac-ft of water in the reservoir. Chimney filters and drains, a butt-welded 1” thick steel conduit encased in reinforced concrete, and an LLDPE liner were included in the project design to reduce risks under static and seismic loading conditions. Risk analyses performed by the Bureau of Reclamation demonstrated that the risks associated with the new low-level conduit are less than the risks associated with the existing siphon.

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