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This research is one of the field survey on the self-purification of the contaminated river water in a small town area, in which the undertaking of drainage works has been underconstructed during about 8-years. The field survey basin is about 5 km2 area and about 3.6km length of channel and then six-stations are decided for measuring points of water quality such as temperature, DO, conductivity, BOD, T-N, and T-P, still more volume of flowing water. The results obtained during 8-years are discussed about time series change characteristics. Especially, the purification effects of BOD, T-N, and T-P were maked clear by rate values of improvement relating to the diffusion ratio of drainage.

RESEARCH ON EFFECT OF DRAINAGE WORKS FOR IMPROVEMENT OF WATER QUALITY IN THE CHANNEL OF SMALL TOWN AREA