For the last two decades, Vietnam has achieved great developments in economic. Our country is in the middle of industrialization and modernization process. But side-effects of economic developments which is greater than ever are environmental problems, especially water pollution. At present, with the pressure of environmental pollution, river water quality is showing signs of pollution at some degrees. For the season, it is necessary to assessing and monitoring river water quality, then using models to simulate water quality to propose managing strategies. In order to contribute and improving the water quality model for Cau River, we carried out the research: “Preliminary assessment and simulation of the water quality.
