In overland flood flow analysis, the Cartesian coordinate model has been commonly used for its easiness of mesh formation. However, in the application of it to urban area, blocking of inundation flow by buildings or spread of it along streets cannot be well expressed. In order to improve this, the "Generalized curvilinear coordinate model" is taken and "Street network model" in which a network comprises links of streets and nodes of intersections is developed here. The results obtained by the above two models and the Cartesian coordinate model are studied and the advantage of "Street network model" is designated.
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