Severe floods and droughts have raised concerns about managing rivers. This study looked at how streamflow variability and baseflow contributions are related in the Nakdong river basin. They used two Streamflow Variability Indices (SVI) and three methods to separate baseflow. The Baseflow Index (BFI) ranged from 0.14 to 0.90 for 27 gauge stations. BFI had a stronger correlation with Coefficient of Variation (CV) than with Coefficient of Flow Regime (CFR). The study found that as baseflow contribution increased, streamflow variability decreased.