Abstract
For understanding water environments in urban rivers under rainy conditions, the intensive field measurements of water quality and hydrodynamic environments were carried out at several urban rivers and the Edo River in which the scale and environments of the watershed are different. The observed results indicate that the differences of the water quality environments between urban rivers under rainy conditions are closely related with those of sedimentary environments. The contribution of the sedimentary environments to water quality environments in the Edo River is much smaller than that in the urban rivers due to the property of erosion rate of sediments. The origin of the particulate matters in urban rivers is quantitatively discussed with the observed data for the erosion rate of sediments.
