| The objective of this study was to examine stream characteristics of water quality and pollutant loading during weekdays and weekend. Water samples were collected in the Singal stream in Kyunggido. The water quality of the Singal stream was studied by the measurement of the parameters related to the trophic levels and pollutant loading. BOD, N and P concentrations was maintained at high level during the investigation period. At SG1 site which is located at the upstream, the daily fluctuations of trophic level parameters showed no characteristics during a day. However, the BOD concentrations during weekdays were higher than those on weekends. Compared to the BOD concentration changes, N and P concentrations showed no noticeable differences. The concentrations of BOD and N were increased in SG2 site where two sewage port were located. Especially, the BOD concentration during the weekend showed large daily fluctuations. From the TN/TP ratio monitored from May 1995 to April 1996, we conclude that nitrogen and phosphorus are the limiting factors in the Singal stream. Pollutant loading was higher in SG2 site, and showed a large deviation during a year. From these data, one-time measurement of water quality characterization is not suitable for urban sites. Water quality characterization of urban small stream should be represented by monitoring the concentration variations of weekday and weekend in the water sampling practice. |
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