Abstract
For adequate river management, flood fighting and flood control in urban small river basins, it is important to understand the characteristics of short time rainfalls in small catchments, including rainfall's migration, their rise and declime, as well as the time-space distribution. Concentrated shorttime thunderstorms and widespread longtime rainfalls of typhoons are the main cause of flooding in urban small river basins. In this study, the characteristics of short time, 5-30 minutes rainfalls within 23 square km area of thunderstorms and typhoons are studied based on the densely-observed data from the gauging station network in Tokyo. The possibility of short-term rainfall prediction is considered from the analysis of these characteristics.
