Taking indicators the case of an university campus runoff quality in Main Urban Area of Chongqing

three kinds of stormwater runoff quality were monitored

where indicators included pH

suspended Solids(TSS)

chemical oxygen demand(COD)

ammonia-nitrogen (NH3-N)

total phosphorus(TP)

and so on. The results show that the average concentration of stormwater runoff pollutants exceed the fifth level of the environmental quality standards for China except TP

SS concentration of runoff can reach 1 730 mg/L

COD and NH3-N concentration of runoff can reach 76.25 mg/L and 3.67 mg/L; First flush takes effect evidently

and SS、COD、NH3-N first flush concentrations of concrete road surface were 2330mg/L

106.4mg/L

5.64mg/L. First flush concentrations were equivalent to 2-4 times of Event Mean Concentrations(EMCs)，and the highest concentration value of pollutants appeared when runoff produced 10~15 minutes later。Comparison on runoff quality of three different rainfall intensity

higher intensity was positively correlated with TSS

COD

NH3-N

and TP concentrations，among which rainfall intensity taked greatest effect on runoff pollutants concentration of large slope road.