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Water quality variations were investigated at 4 locations of Jungrang river (upper, middle and lower basins) during a period of 3 rainfall events. During the rainfall, concentrations of , SS and significantly increased, while the concentration of T-N decreased and that of T-P remained relatively constant. This pattern became more apparent as the level of accumulative precipitation and rainfall intensity increased. Simple regression analysis showed that the accumulative precipitation was positively correlated with all water quality pollutants except for T-N. With increasing accumulative precipitation, the concentration of T-N decreased, while the others increased. of simple regressions of hourly average rainfall intensity and water quality pollutants, showed wider range of variation ranged from 0.483 to 0.992, which indicated a strong correlation. The stronger the hourly average rainfall intensity, the more T-N and T-P in the upper basin, more in the middle and lower basins, more SS with gradual increase from upper to lower areas, and more with gradual decrease from upper to lower region. Simple regression showed that water quality pollution in the upper basin was more sensitive to an increase of rainfall discharge than that in the middle and lower areas.

Characteristics of Temporal Variation on Water Quality (T-P, T-N, CODMn, SS, BOD5) in the Jungrang Stream during Rainfall Event

Characteristics of Temporal Variation on Water Quality (T-P, T-N, COD_Mn, SS, BOD₅) in the Jungrang Stream during Rainfall Event