| The water environment capacity (WEC) means the maximum of pollutants carried by water body under certain water quality standards. WEC was the key technical parameter for the total amount control of pollutants, the primary restricted condition of the water resource planning and also the important basis for implementing environment target management on water body. Thus how to exactly and objectively determine WEC in different water areas has always been a hot issue in water resource protection, especially for the tidal river network region. Due to complexity of hydrodynamic condition and pollutant transfer characteristics, the study of WEC will keep on.On the basis of the previous study, this paper summarized main computing methods and present research situation of WEC at home and abroad, analyzed the methods for WEC calculation in the tidal river region, and then pointed out the difficulties in present research, and trends and emphases in future research.Rongjiang River system was taken as an example in this paper. And COD_Cr NH3-N, TP were chosen as objects investigated, the flow-quality models for the tidal river network were established and used to simulate and analyze the hydrodynamic condition and the water quality transfer character in Rongjiang River system.In this paper, the basic theory of the present methods for WEC calculation was analyzed. Then, according to the flow and pollutant transfer characteristics in the tidal river network, an improved algorithm was presented successfully applied to calculate WEC of main rivers of the Rongjiang River system. Taking WEC of the river between Wushi Dam and Sanzhou Dam in the upstream as an example, two methods, the capacity definition method and analytic solution were compared. At last, the program of waste total quantity control was proposed, which provided technical support for decision-making in water resource protection for the Rongjiang River system.
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