title: The temporal changes in road stormwater runoff quality and the implications to first flush control in Chongqing, China.
abstract: This study investigates the quality of stormwater runoff from a driveway in the southwest mountainous urban area of Chongqing, China, from 2010 to 2011. The results showed that the mean concentrations of chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) were 4.1, 2.4, and 2.2 times the grade V levels of the national surface water standard of China. The pollutant concentration peak preceded or synchronized with the rainfall intensity peak and occurred 10 min after the runoff started. The significant high pollutant concentration in the initial stage of the rainfall suggested that first flush control is necessary, especially for the most polluted constitutes, such as total suspended solids, COD, and TN. Three potential pollution sources were identified: the atmospheric dry and wet deposition (TN, NO₃(-)-N, NH₄(+)-N, and DCu), the road sediment and materials (total suspended solids, COD, and TP), and the vehicle emissions (DPb and DZn). Therefore, this study indicates that reductions in road sediments and material pollution and dry and wet deposition should be the priority factors for pollution control of road stormwater runoff in mountainous urban areas.
authors.affiliation: State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Zhang
authors.forename: Xiaoke
authors.initials: X
authors.lastname: Wang
authors.forename: Peiqiang
authors.initials: P
authors.lastname: Hou
authors.forename: Wuxing
authors.initials: W
authors.lastname: Wan
authors.forename: Yufen
authors.initials: Y
authors.lastname: Ren
authors.forename: Zhiyun
authors.initials: Z
authors.lastname: Ouyang
authors.forename: Le
authors.initials: L
authors.lastname: Yang
mesh_terms: D002681:China; D004784:Environmental Monitoring; D009584:Nitrogen / Q000032:analysis; D010758:Phosphorus / Q000032:analysis; D011891:Rain; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*; D014877:Water Pollution, Chemical / Q000032:analysis
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen