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문경환,김영규,정문호 ( Kyong Whan Woon,Young Gyu Kim,Moon Ho Chung ) 한국하천호수학회 1992 생태와 환경 Vol.25 No.4
Kyongan Stream, one of the first stream flowing into the Han River, was investigated in the viewpoint of its pollutants load run-off into Pal`tang Reservoir which is the most important sorurce for the tap water supply to Seoul City. DO, BOD, COD, SS, and pH values were measured at five selected stations in the stream monthly during the period from January 1989 to December 1991. The amount of pollutants load at each station was also computed on the basis of data adopted from Yongin and Kwangju Gun. Stations 1, 2 located in the upstream were revealed to be heavely contaminated by social sewage and breeding activities of the domestic animal. Stations 4, 5 in downstream were, however, measured to become somewhat better in DO, BOD, COD and SS values possibly due to the increase of the flowing amount by the joining of second streams, i. e., Nungwon Stream. Values of pH ranged from 6.9-8.1 all the year round. DO value showed to decreased in summer season, however, BOD and COD values increased in the winter. Decreaseof DO value might be due to the increase of water temperature, since increase of BOD and COD values by the increase of the flowing amount.