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Water quality of the Koejong-reservoir was estimated by using the ecological model to evaluate the effects of industrial sewage discharge. State variables consist of POC, DOC, phytoplankton, DIP, DIN, DO and COD. Initial conditions for the compartment are applied to the model based on the observed results. The reproducibility was found to be satisfactory with the relative error ranging between the calculated value and the observed value. Water quality simulation was conducted by applying additional industrial sewage discharge into the Koejong-reservoir. The concentrations of COD, Chl.a, DIP and COD showed fluctuations of a narrow range. The increment percentages of Chl.a, COD and DIP were 26.6%, 20.2% and 18.2%, respectively. In the case of DO, the concentration decreased 4.8%. Key words : Ecological model, Reservoir, Water quality, Pollution, Simulation 1) 1. Introduction Except for the man-made lakes or reservoirs nearby the big rivers, the ecosystem of lakes and reservoirs in Korea consist mostly of small lakes and reservoirs with shallow depth, which are easily influenced by the pollution sources in the basin zone. Since 1990, the majority of agricultural reservoirs have been showing eutrophication cause by the inflow of phosphorus and nitrogen from the watershed. The reservoir ecosystem has been disturbed by the increased productivity and bloom of phytoplanktons. Especially, the ecosystem of the man-made lakes and agricultural reservoir ecosystem in southwestern region of Korea is influenced by intensive farming and changes in of the waterside habitual environment accelerated by industrialization (Seo, 1978; La et al., 2008).The natural phenomena taking place in the environment are extremely complicated, it is difficult to figure them all out exactly by research concentrated in a single field of study. The interdisciplinary model plays an important role as a tool to study, investigate and combine various information collected from a number of disciplines. The modeling process enables us to grasp the phenomena taking place in the study area, prioritize the research procedures, and plan the necessary data collecting. Prediction is another useful role of the model. When it is impossible to experiment on the natural environment directly, the model can be

Water Quality Simulation of the Reservoir Using Ecological Model