STUDIES ON FLOOD RUNOFF CHARACTRISTICS OF URBAN RIVER USING A PHYSICALLY BASED MODEL OF SEWAGE NETWORKS

The purpose of this study is to elucidate physical phenomena and hydraulic processes of urban river runoff in channe networks. We carried out field observation to investigate the runoff processes in several urban areas, and its hydrologic data was compared with the results calculated with runoff model. The following results were obtained; 1) hydrologic parameters adjusted with a single-peaked rain storm which reproduce the urban runoff processes with high accuracy fo many different types of rainfall pattern are tested. 2) especially the results of the calculation for single-peaked rainfall as we as those for constant intensity rainfall agree with the observed values, however peak discharges calculated for multi-peake rain storm found to be under estimated. 3) surface runoff analysis adopted land use distribution and pattern reproduces runof processes with high accuracy. 4) hydrological parameters adjusted by field observation reproduce flood runoff processes.