The dynamics of physico-chemical and hydro-biological characteristics were examined on the 4 stations of Shinchuen water system in Taegu from March to September in 1978. The ranges of concentration variations of water environmental matters were as follows: 5.7∼9.40 for pH, 0.59∼12.4 ppm for DO, 0.7∼36.9 ppm for BOD, 5.01∼114 ppm for COD, 0.007∼2.2 ppm for PO₄, 10∼135 ppm for Cl^-, 0.03-20.4 ppm for NH₄^+, 0.17∼8.90 ppm for NO₂^-, 7.4∼222 ppm for NO₃^-, 8.01∼80.1 ppm for Ca^(++), 22∼214 ppm for Alkalinity and 0.003∼0.275 ppm for Surfactants. To demonstrate total loads of important pollutants, the flow rates of the stream were multiplied by the respective concentrations of the matters. The estimations of the maximum loads by Taegu population were 18.2, 69.9, 0.50, 86.7 and 0.241g per person per day, respectively for BOD, CUD, PO₄, Cl^- and Surfactants. Dominant populations in the upper clean stream were phytoplanktons of Chlorella sp., Spirogyra sp. and fishes of Moroco oxycephalus, Misgurnus mizolephis. But more tolerant populations Oscillaloria sp., Phormidium sp., Nitzschia sp., Navicular sp. and Vorticella sp. dominated in the lower polluted stream.