[Research on the characteristics of urban roof runoff in Shanghai cultural and educational area].

Based on the monitoring the urban roof runoff quality in Shanghai cultural and educational area during 2003-2006, the variations of pollutants concentrations were analyzed, and then the characteristics of roof runoff quality and the influential factors were studied by statistical methods. From the probability plot of the EMCs, it was showed that all the pollutants concentrations had the good fitness for lognormal distribution. And the EMCs of COD, SS, BOD5, NH4(+)-N, TP, TN for the urban roof runoff in Shanghai cultural and educational area were 42.6 mg/L, 76.9 mg/L, 15.2 mg/L, 1.61 mg/L, 0.14 mg/L, 4.8 mg/L respectively. The roof runoff quality was mainly influenced by dry weather deposits and the washed out effects during rainfalls through the cluster analysis.