Besides in a tunnel or a damsite, the analysis on the groundwater movement mechanism in bedrock is also being developed in the subject of the underground petroleum storage and the disposal of nuclear waste in recent years. Up to now, the reports concerned on the hydraulic property of permeability and distribution of the water pressure are mainly in local bedrock around these facilities, but very few in the wide area.
In this study, using the investigation of hydrogeology and borehole test, the observation of weather and river flow for two years in the granite zone, we discussed the mutual relationships among groundwater, river flow and outflow based on the tank model and quasi three-dimensional groundwater flow analyses in the basin. We get some valuable data as a characteristic of runoff percentage on hydrological cycle mechanism and the influence of groundwater.