Jim Falls Hydro Redevelopment Project Construction

by P. D. Colgan, Northern States Power Co, United States,
S. A. Armbruster, Northern States Power Co, United States,



Document Type: Proceeding Paper

Part of: Waterpower '89

Abstract:

The Jim Falls Hydro Redevelopment Project consists of two 28.5 MW vertical Kaplan units in an enclosed powerhouse with an adjacent spillway. The spillway contains three radial gates, each with a flap gate section on top for ice sluicing. All gates are hydraulically operated. The new spillway and new fuse plug dike, in conjunction with the existing main spillway, are designed to pass the probable maximum flood of 330,000 cfs. The width of the existing 4,000-foot long plant headrace canal was expanded from 300 feet to 1,000 feet in order to pass the increase flow to the powerhouse and excess flow to the new spillway. The power canal expansion required the relocation of a county highway and two new bridges. A 500 kW minimum flow unit was installed at the existing main spillway to maintain a flow in that portion of the Chippewa River which parallels the headrace canal. This paper describes the project features, construction, and unique turbine-generator features.

Subject Headings: Spillways | Power plants | Hydro power | Project management | Occupational safety | Gates (hydraulic) | Canals

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