Abstract
Urban nonpoint pollutant sources are considered to have a great influence on receiving water, because micro toxic substances like polycyclic aromatic hydrocarbons (PAHs) are exhausted from automobiles, etc. As most stonnwater from the urban nonpoint sources is discharged into the receiving water through stormwater drainages, it is important to know pollutant behavior in runoff process and its impact on ecosystem in the water body. The objective of this study is to survey standing stock and behavior of urban nonpoint pollutants in their runoff process. It also aims at examining an ecological impact of the urban pollution on the receiving water. From the surveys on the standing stock and behavior, differences in content ratio of pollutants in urban sediments from their sources to receiving water were shown. And, from the examination on the ecological impacts, ecological toxicity of the urban sediments for Chirvnomus yoshimatsui was shown. As a result, some significant knowledge for the environmental management of urban pollution has been obtained.
