Abstract
Under the frequent floods caused by localized concentrated heavy rainfall, it becomes considerably important to achieve detailed rainfall, especially localized concentrated heavy rainfall in a small urban watershed. X-band MP-radar, providing space-time distribution rainfall data, is expected to be made effective use of its advanced detailed data, while few studies on the precision evaluation of 1-minute X-band MP radar data were conducted. This paper discusses results on the precision evaluation of X-band MP radar data by comparison to 1-minte ground observation rainfall data, installed in high density at the upper basin of Kanda river in Tokyo. The results showed that 1-minute data of X-band MP radar realized detailed space and time scale rainfall distribution, though it was hardly met by 10-minutes data, and sufficiently described localized concentrated heavy rainfall in a small urban watershed.
