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From the data analysis of hourly rainfall at the Kizu River basin, we found that the rainfallfield was isotropic in time and space within some divided periods of time coordinate and at thesame time the time correlation was independent of spatial correlation. Under those conditionsthis paper studies the simulation in time and space of areal rainfall based on the isotropic randomfield theory. Through the comparison between this theoretical areal rainfall and Thiessen methodwe pointed out that Thiessen method was efficient in the small basin in area. Lastly those simu-lated rainfall were input to the runoff system models, kinematic wave and storage function models.We estimated the variability of identified parameters and the error between observed and calculatedhydrographs.