Abstract
A grid-based hydrological cycle analysis model, developed and verified in an urbanized small river watershed, is applied to Tama river basin. This model is a physically based distributed one considering not only natural hydrological cycle but also artificial water use. In this paper, a modeling technique is described for the Tama river basin that has 1, 240km2 and a population of about 3.4 million. Then the model calibration and verification are carried out with several river and ground water observation records. The simulated results show relatively good agreement with the observation. Interflow conductivity is found to be an important parameter for river discharge during the flood and its recession period.
