Pollution characteristics of runoff in different function areas of Hangzhou city

The urban land use is a major factor affecting water quality in the urban watershed,which has the correlation with water quality,i.e.,this relationship is affected by the types of land use and the spatial distribution.The surface runoff in different function areas of Hangzhou was monitored after typical rainfall to investigate the variations of pollutants concentration,event mean concentrations(EMCs) and the pollutant load of runoff caused by rainfall water.Results showed that the pollutant concentration is up to the higher value in the first 5-20 min and then descended to a stable value in a wavy pattern,which indicates an obvious scouring effect in the early step of rainfall.Furthermore,the pollution load in different types of land use from high to low is traffic area,industrial area,commercial area and residential area.