강우시 시화호 농촌 및 공단유역의 비점오염물질 유출특성 (Characteristics of Non-point Source Pollutants Runoff from Agricultural and Industrial Areas in Lake Sihwa Watershed)

The characteristics of stormwater runoff was examined on distinct types of agricultural and industrial area in Lake Sihwa watershed. During rainfall event, the peak concentrations of SS, CODMn, and TP were observed after 6~11hours of rainfall in agricultural areas. Whereas, the peak concentrations occurred within the first one hour after rainfall and then the highest concentration of NPS pollutants sharply decreased, showing strong first flush effect in industrial areas. The strong first flush effect of suspended solid was apparent in agricultural areas, while those of organic matters and nutrients were clear in industrial areas. The cumulative load curves for NPS pollutants showed above the 45° straight line, indicating that first flush effect occurred in industrial areas. The mean SS EMC values of agricultural areas ranged from 60~598mg/L (Avg. 285mg/L), it was higher value when compare to other areas. While the mean CODMn, TN, and TP EMCs values of industrial areas were shown the highest values as 67.7mg/L, 12.1mg/L and 2.1mg/L respectively.

The characteristics of stormwater runoff was examined on distinct types of agricultural and industrial area in Lake Sihwa watershed. During rainfall event, the peak concentrations of SS, CODMn, and TP were observed after 6~11hours of rainfall in agricultural areas. Whereas, the peak concentrations occurred within the first one hour after rainfall and then the highest concentration of NPS pollutants sharply decreased, showing strong first flush effect in industrial areas. The strong first flush effect of suspended solid was apparent in agricultural areas, while those of organic matters and nutrients were clear in industrial areas. The cumulative load curves for NPS pollutants showed above the 45° straight line, indicating that first flush effect occurred in industrial areas. The mean SS EMC values of agricultural areas ranged from 60~598mg/L (Avg. 285mg/L), it was higher value when compare to other areas. While the mean CODMn, TN, and TP EMCs values of industrial areas were shown the highest values as 67.7mg/L, 12.1mg/L and 2.1mg/L respectively.