Abstract
The storm runoff process is discussed using groundwater table fluctuation data collected during heavey storm events in an area of teatiary hills. Before the collection, the soil structure was surveyed using a hammer-driven impact-type penetrometer. A “hydrological base” on which saturated throughflow takes place was drawn using the survey, and its characteristics are discussed. The storm event data show that the process of generation and development of the saturated zone on the hydrological base is similar to the variable source area concept, which describes the generation and development of saturated overland flow. The former process seems to be more common on steep forested slopes. Therefore, instead of the variable source area concept, the variable source volume (space) concept (in which the role of saturated throughflow is emphasized) is presented as a storm runoff mechanism on forested slopes.
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