Large areas of cyanophytes have covered Chaohu Lake in July,2008, which endangers the sanitation of drinking water and health of inhabitants living along the Chaohu Lake. Since Regulations on the Prevention and Control of Water Pollution in Chaohu Lake Drainage Area (refers to Regulations hereinafter) was executed, it has been nine years long. In the beginning, to some extent, Regulations played a positive role in the prevention and control of water pollution. However, with the development of social economy...