Abstract
This paper discusses the water quality formation in the headwater zone of a river with a dam reservoir at its downstreamend. Other result analysis indicates that, the released water from the purification center in the upstream affect very match influence the water quality of the reservoir influent most became clear. Moreover, it is understood the water quality formation of the valley can be classified with the land cover in the catchment. In addition, the necessity of the forest management was suggested from observed value of the TN and suspended solids on private ground. One of the source countermeasures that consider the water quality control of the reservoir is to pay attention to the fluctuation of the released water at the purification center.
