The main purpose of this study is to develop a “Water Budget Model” for basin regions and consider its potential application to the Ise Bay Basin Region. The model is developed based on watershed and river system and takes into account land coverage, water use and precipitation. As a result, the model could roughly explain the actual river flow and the characteristics of water budget in relation to watershed and river system. The model showed that urban coverage in urban area particularly has a great influence on water budget.
