| Summary: | A modelling study on the trade-offs between the production of Atlantic salmon (Salmo salar) and the production of power at Laudal hydropower plant was conducted. The study examined the use of physical mitigation measures versus - and in addition to - changes in release of water. The study objective is an optimization of the environmental design through and downstream of the Bjelland and Laudal Hydropower plants in the Mandalselva River in Southern Norway, through demonstration and evaluation of a proposed methodology, to be used in other projects/rivers. The methodology is a tool for a) prediction of the potential trade-offs between smolt production and power generation b) evaluation of cost-effectiveness in smolt production and loss in power production (spill of water). At the end, as an additional point the data at Laudal will be compared with the results in the upstream bypass section at Bjelland reach, in order to see the effects in different stretches if the same mitigation measures are implemented.
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