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Artificial circulation in British Columbia started at Corbett Lake in the early 1960s and progressed through an experimental period at Yellow Lake (1976-1979) before developing into a full scale program in the 1980s. A review of 23 circulation projects identified site selection (infrequent winterkill), equipment (hose kinking, diffusor design, compressor and blower breakdown), operation (maintenance and seasonal scheduling) and evaluation (oxygen concentrations, fish survival and angler response) as the most common problem areas. Benefit-cost analysis was used to assist in evaluating the cost effectiveness of artificial circulation. The average benefit-cost of a sub-sample of 10 Kamloops area artificial circulation projects was 3.5 for electric units and 2.4 for diesel units under ideal conditions. Actual benefit-cost ratios may be lower due to infrequent winterkill and equipment and operational problems. The principal conclusion from the benefit-cost analysis is that site selection is the most important fact
Ashley, Kenneth A.. 1987. Artificial Circulation in British Columbia: Review and Evaluation. Ministry of Environment and Parks. Fisheries Technical Circular. FTC78
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