From the Introduction:
"The purpose of the investigation was to study the feasibility of augmenting agricultural water supplies in the Okanagan Valley by diverting water from the Shuswap River. The study considered two possible means of diverting water from the Lower Shuswap River near Enderby through a canal to the north end of Okanagan Lake. A number of variations in the amount of water to be diverted and the amount of residual flow in the Shuswap River below Enderby were also considered. The Report refers to the water necessary for fishery requirements in the Okanagan River below Skaha Lake, but makes no reference to possible fishery problems in the Shuswap River that would be associated with the diversion being studied."
"Prepared by the Technical Staffs of the Department of Fisheries and Forestry Canada and the International Pacific Salmon Fisheries Commission in Collaboration with the Fish and Wildlife Branch, British Columbia Department of Recreation and Conservation"
See the Report [PDF]. Note: scanned copy of original document.