Current Status of Urban Hydrology in Japanby Tomitaro Sueishi, Osaka Univ, Dep of Environmental, Engineering, Suita, Japan,
Abstract: After World War II the devastated Japanese landscape was ravaged repeatedly by heavy typhoons causing severe damages. Nevertheless, a hydrological data acquisition system was not adequately provided for. The concept of synthetic unit hydrograph and Thiessen methods were applied in research projects in order to clarify the river basin runoff mechanism. In Japanese river basins with generally steep slopes, however, the portion of direct surface runoff during flood periods is so predominant that the nonlinear runoff mechanism is of great importance. Certain revisions might be necessary to account for the total runoff based on the unit hydrograph. Refs.
Subject Headings: Hydrology | Runoff | Urban areas | Hydraulic engineering | Hydrologic data | Data processing | Basins | Rivers and streams | Hydrographs | Japan | Asia
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