Urban surfaces covered with asphalt and concrete have been changing hydrological cycle in urban river basin. To assess the effects of various measures for conserving natural water balance, its appropriate quantification must be carried out. As a detailed model for estimating hydrological cycle requires a lot of hydrologic data and computational resource. We tried to buildup a simple model which utilize existent data source to grasp monthly water balance. The model was applied to the Tsurumi river basin to verify the accuracy in estimating flow rate and other hydrological variables. It is found that the model is likely to be useful in assessing monthly water balance both in rainfall and non-rainfall periods.
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