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The majority of lakes in the eastern part of China are shallow and in various stages of decaying．Chaohu Lake is a typical example and was chosen as a case study in the Cooperative Ecological Research Project(CERP)．Through various observations and sample analyses，the environmental impact of heavy nutrient load was assessed，and a multi-dimensional picture of the eutrophication state was obtained．Chaohu Lake is in hypertrophk state and has many typical symptoms：high concentrations ofphosphorus and nitrogen，frecluent algal bloom,dominance of bluegrecn algae，high content of chlorophyll-a，low Secehi Disk depth and abnormal siltation of the lake．The lake pollution is still developing and in recent years has affected the city water supply and the regional economy．
