In this study, rainfall runoff characteristics according to peak concentration were analyzed using the water quality and
flow data in the Geumho river, and the direction of nonpoint source management such as monitoring and
management period by pollution source was derived. Peak Water Quality Concentration is the concept that utilizes
the extreme value as the concentration of non-point pollution control standard with the highest water quality in the
rainwater runoff. Using this method, the evaluation factors such as cumulative precipitation(total precipitation), peak
water quality concentration, cumulative precipitation up to peak water quality concentration, time to peak water
quality concentration, and EMC to peak water quality concentration were examined and long- Rainfall runoff
characteristics of nonpoint sources were analyzed. The results of the analysis suggested proper monitoring and
management method to manage nonpoint source.