This paper deals with environmental problems of reservoir development with special regard to hydro-electric power development in Sweden. Methods for predicting and evaluating the environmental effects and for reducing the effects by corrective and complementary measures are indicated.A brief review is given of effects on local climate, water stages, water discharges, stream conditions, ice conditions, groundwater, shoreline erosion, sediment transport, water quality, sediment deposition, vegetation and animal life, including aquatic fauna and fish production. Decisions on future uses of natural resources should be based on a sufficient knowledge of possible effects, gained by environmental study programs.Corrective and complementary measures aim at a preservation of as much as possible of the original landscape characteristics. Compensation for decreased fish production and the establishment of facilities for tourism and recreation are other measures mentioned.
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