Libby Reregulating Dam, Kootenai River, Montana. Hydraulic Model Investigation.
ARMY ENGINEER DIV NORTH PACIFIC BONNEVILLE OR DIV HYDRAULIC LAB
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The proposed Libby Reregulating Dam would be located on the Kootenai River 10 miles downstream from Libby Dam. One of the principal features of the project is combination of the spillway and powerhouse in a single structure. Design of the spillwaypowerhouse was verified using three models--a 150-scale spillway model, a 135.33-scale spillwaypowerhouse sectional model, and a 180-scale comprehensive model. Tests in both the sectional and comprehensive models were accomplished using both fixed and movable-bed boundaries. During early stages of project design, a baffled-chute spillway was developed which proided capability for reduction in nitrogen supersaturation. Evaluation of the design accomplished in a 125.11-scale model is included as an appendix to this report. The spillway exhibited adequate energy dissipation for discharges up to 903 cfs per foot and potential for reduction in gas supersaturation for discharges up to 181 cfs per foot. The concept was not pursued in final design due to economics combined with operating considerations at the upstream Libby Dam. Author
- Civil Engineering