A water quality monitoring program in spring and fall 1979-80 was continued from Environmental Protection Services studies in 1976-78 to evaluate long-term trophic changes in the main body of Lakes Okanagan, Skaha, Osoyoos, Wood and Kalamalka. Bi-weekly sampling in April-October 1979 at a shallow station in Vernon Arm of Okanagan Lake served to document the water quality response to complete sewage removal in August 1977. Although no large water quality changes have occurred in Okanagan Lake since 1971, slight increases in total dissolved phosphorus and total nitrogen have been noticed in 1979 and 1980. Continued reduction in nutrient levels and algal biomass in Vernon Arm attests to the improved water quality following sewage diversion. Skaha Lake has shown signs of a reversal in the improved water quality noted in 1976-78. Increased spring phosphorus and phytoplankton chlorophyll a levels in 1979 have approached values reported in 1969-71 prior to phosphorus reduction in Penticton sewage. Osoyoos and Wood L
Jensen, E.V.. 1981. Results of Continuing Water Quality Monitoring Program on Okanagan for Years 1979 to 1980. BC Ministry of Environment
Keywords: results, water quality, monitoring
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