抄録
To improve water quality of a lake, the domestic wastewater pollutants reduction and non-point source pollutants reduction in those are flowing into the lake is necessary. Because a countermeasure to non-point source pollutants control is not had done enough, we must recognize an influence of non-point source pollutants on water quality of the lake and we must execute an appropriate countermeasure against them. There, at first, we examined an influence of the domestic wastewater and non-point source pollutants on water quality of the river which is flowing in the model basin. At this examination, we applied “Simulation System for Evaluation the Environmental Condition of the Basin”. By means of this simulation system, we can simulate the production of pollutants at point sources and non-point sources in a basin and simulate runoff processes of these pollutants. From these simulation results, we made the following matters clear. A present water quality of the river is greatly influenced by the domestic wastewater. An execution of a countermeasure against the domestic wastewater is necessary for water quality improvement. It will be important that the countermeasure for non-point source pollutants reduction by the execution of the countermeasures against the domestic wastewater pollutants. Moreover, we proposed many control measures of the domestic waste water and non-point source pollutants to improve water quality of the lake.
