Significant seepage from rivers into groundwater sometimes causes difficulties in river flow management particularly in the sense of water environment and its conservation. Kurobe river which runs from Northern Alps of Japan into Japan Sea forms an alluvial fan in the range of 13km from the sea. NK-GHM which is a quasi-three dimensional hydrological cycle analysis model has been applied to clarify hydrological cycle in this area including seepage/discharge from/to the river. The model was tested by comparing with river flow rate, groundwater height and other observations and the model well described the observations.
