Peak concentrations of pollutants in the Gumho River watershed were analyzed to develop a plan for managing nonpoint pollution sources. By studying long-term monitoring data, researchers identified the main pollutants and proposed reduction techniques. They found that BOD levels were highest in March and April, COD in April, SS in April and August, T-N in April, and T-P in August. The peak pollutant concentrations were highest in the main stream of the Gumho River from April to August and in the tributary from March to August. This study suggests ways to reduce nonpoint pollution in the watershed by targeting specific pollutant sources.