Abstract
Heavy rain that began to fall from the beginning of August 26, 1998 wasespecially intense in the boundary region of Fukushima and Tochigi Prefectures. The total rainfall in six days reached more than 1200mm. This paper deals with the runoff analysis in the Abukuma River basin for this rain. The model based on the channel network with the mesh size of 500m and the kinematic wave approximation for the dircct runoff component was applied. The comparison between analysis and observation in the discharge gives the runoff rate of 0.73 which is about twice for the usual floods in the basin. The long duration of the previous rain is supposed to affect the high efficiency of the runoff.
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