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We showed that the amount of irrigation water was 34.4 m3/s during irrigation period in the kinokawa river, Japan. This is very large compared to the river discharge in a normal flow condition. To take water use into account a runoff analysis using a distributed hydrological model, we proposed a new model that consider the water-intake from head works, inflow, storage and flood control by dams. It was found that the simulated river discharge using this model agreed with the observation data, especially for the low water flow in the irrigation period. In addition, the reduction rate of irrigation water from paddy fields to kinokawa river was inversely estimated. The rate was low in a small precipitation year and was high in a high precipitation year. This characteristic agrees with a traditional and empirical water uses of irrigation water.

RUNOFF ANALYSIS USING DISTRIBUTED HYDROLOGICAL MODEL WITH IRRIGATION WATER USE MODEL IN THE KINOKAWA RIVER