2009 Volume 15 Pages 43-48
The sudden water level rising caused by the severe rainstorm at the Toga River in July 2008 claimed five people. To prevent the water accident, a distributed rainfall-runoff analysis is conducted to understand the sudden runoff phenomena. The rainfall-runoff analysis and observed camera images revealed that discharge which caused the sudden water level rising came from the residential area and contribution from the mountainous area was quite small. It is proposed that only to monitor the discharge at the upper reaches is insufficient to prevent the accident; detailed distributed rainfall-runoff analysis with radar rainfall is essential to predict the runoff phenomena at the urbanized small catchment; and to foster the common view to keep off from the river at the alert of heavy rainfall warning is indispensable to avoid the accident.
