| Urban road runoff and the Combined Overflows are important pollution source of urban water environment because of their characteristics such as irregularity, bursting and wide-ranging. Little research has been made on these subjects in China. On the base of intensive literature survey and data collection taken in Baoji, conclusions were made as follows.(1) The concentration of pollutants in runoff is relevant to the quantity of solids on the road. The more these solids got into the runoff, the higher the pollutants concertration we measured. The results of road runoff pollutant determination in Baoji are as follows. The concentrations of TCOD, SCOD and SS varied from 854mg/L to 149mg/L, 198mg/L to 16mg/L and 989.8mg/L to 161.7mg/L respectively. The range of NH3-N, TKN and TP was from 9.8mg/L to 1.83mg/L, 14.13mg/L to 2.62mg/L and 1.1mg/L to 0.37mg/L, respectively.(2) The concentration of pollutants in CSO not only related to the pollution degree of runoff, but also related to the rain intensity. The results of CSO pollutant determination in Baoji are as follows. The concentrations of TCOD, SCOD and SS varied from 1536mg/L to 427mg/L, 588mg/L to 209mg/L and 1387.5mg/L to 154.5mg/L respectively. The range of NH3-N, TKN and TP was from36.14mg/L to 9.41mg/L, 45.52mg/L to 13.08mg/L and 8.73mg/L to 2.46mg/L, respectively.(3) According to the particularity of Baoji, some effective methods were put off. The infiltration system and road cleaning are the plans for runoff pollution prevention and the rebuilding of the drain system and construction of storage tank for wastewater are the methods for CSO problems.
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