Turbine intake modification for fish guidance
Army Corps of Engineers, Bonneville Dam, bypass, Columbia River, fish guidance, flow patterns, guidance, guidance efficiency, intake, structures, turbines, upstream
Journal or Book Title
Water Power & Dam Construction
A fish guidance test conducted on the Columbia River, at Bonneville's second powerhouse, carried out from 1983 to 1985, showed an unusually low guidance efficiency for the existing bypass system. A major problem identified that caused this low fish guidance efficiency was the irregular flow patterns created by the abrupt intersection between the turbine water way and the face of the near vertical headwall of the powerhouse. One proposed remedy to this problem was to modify physically the ceiling contour of the turbine intake. The US Army Corps of Engineers, Portland District, proposed to attach prefabricated structures (turbine intake extensions) to the upstream end of the water passage to streamline the turbine intake.