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This study used Kohonen network model Self-Organizing Feature map(SOFM) with Principal Components Analysis(PCA) and Back-Propagation Network(BPN) to predict Biochemical oxygen demand(BOD5) removal rate of water resource from the surface-flow constructed treatment wetlands at Yuli Township in Hualien County from December, 2005 to June, 2006. With this self-organizing map technology, the water quality...