Abstract
The purpose of this study was to trace the groundwater flow system in the Nagaoka area using subsurface temperature distribution, stable isotopes and water quality. Temperature-depth profiles were measured four times in observation wells during the period 2000–2002. Water was sampled from both observation and pumping wells during the same period. A combination of tracers was used to conceptualize the groundwater flow system. The flow system appears to be divided into shallow, intermediate and deep systems. It is clear that land use, pumping and the infiltration rate are affecting the shallow flow system.
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