This study introduces the collated results regarding the occurrence of freshwater red tide, the associated deterioration of water quality and the performance of countermeasures based on a survey of freshwater red tide conducted from 1992 to 1993. It also reports the results of an examination of the characteristic of reservoirs in which freshwater red tide occurs and control factors for occurrence according to multivariate analysis. Based on these results, a freshwater red tide occurrence prediction model was constructed using discriminant analysis, and this study further reports the results of applying this model to dams under construction.

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