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3-phase adits amperes block 14 Bonneville Power Administration cable cantilever capacity circuit breaker clay seams cofferdam Columbia Falls concrete connected construction contraction joints contractor control bay control board designed diameter disconnecting switches diversion tunnel downstream draft tube drilled electrical elevator towers embedded equipment excavation fault zone feet fixtures Flathead Flathead River floor fly ash foundation frame Furnishing and installing gallery gantry crane gate Government camp grounding grouting hoist Hungry Horse Dam insulated intake kilovolts left abutment load located maximum motor operating panelboard pay item penstocks percent pipe plant plate pounds per square powerhouse pressure protection pump rated relay reservoir reservoir water right abutment river outlets rock seam service bay shaft shear shown on figure single-phase speed spillway spillway tunnel square inch steel stoplogs storage stresses structure sump switchyard temperature transformer trashrack turbine valve house voltage wall water surface