Location
Atlanta, GA
Presentation Type
Presentation
Start Date
10-8-2025 11:50 AM
Description
The Confederated Salish and Kootenai Tribes (CSKT) have been operating Lower Crow Dam under restricted reservoir levels since 2008 due to significant structural and spillway capacity deficiencies that have increased risk to dam safety. Stantec was contracted by the CSKT to evaluate rehabilitation options and provide final design for the new spillway. The focus of this paper is to describe the design methodology and spillway selection process with an emphasis on the hydraulic modeling completed to support the final spillway arrangement. The design approach included the evaluation of various spillway types including gated, Obermeyer, fuse gate, ogee, labyrinth, and piano key weirs. Multiple models were developed through the project including one-dimensional computer models for preliminary design purposes and three-dimensional Computational Fluid Dynamics models for alternative evaluation and to confirm the final hydraulic performance of the spillway structure, inlet channel and chute.
Included in
Value Added 3D Modeling – Lower Crow Dam Spillway Modification and Rehabilitation Project
Atlanta, GA
The Confederated Salish and Kootenai Tribes (CSKT) have been operating Lower Crow Dam under restricted reservoir levels since 2008 due to significant structural and spillway capacity deficiencies that have increased risk to dam safety. Stantec was contracted by the CSKT to evaluate rehabilitation options and provide final design for the new spillway. The focus of this paper is to describe the design methodology and spillway selection process with an emphasis on the hydraulic modeling completed to support the final spillway arrangement. The design approach included the evaluation of various spillway types including gated, Obermeyer, fuse gate, ogee, labyrinth, and piano key weirs. Multiple models were developed through the project including one-dimensional computer models for preliminary design purposes and three-dimensional Computational Fluid Dynamics models for alternative evaluation and to confirm the final hydraulic performance of the spillway structure, inlet channel and chute.