The researchers studied how to protect the Huangshi Reservoir in China from pollution. They used models to calculate the maximum amount of pollutants the water can handle. They found that the reservoir can handle most of the pollution, with the tributaries contributing a smaller amount. They set goals to reduce pollution in the reservoir and its rivers to improve water quality by 2020 and 2025. This study can help manage water quality in the area and serve as a guide for similar reservoirs.