Comparative Study on Characteristics of Urban Rainfall Runoff from Two Urban Lawn Catchments in Macau and Xiamen
城市绿地降雨径流污染特征对比研究：以澳门与厦门为例

A comparative study on characteristics of stormwater runoff from two urban lawn catchments in Macau (ELH) and Xiamen (PGH) with separated sewer system were conducted. The result obtained shows that COD, TP and NO-3-N are the major pollutants with mean EMC of 165.77-60.48 mg/L, 0.96-0.44 mg/L and 7.16-1.18 mg/L, respectively, and the mean values of pollutants loads of COD, TP and NO-3-N from study lawn catchments are 6.53-0.63 kg/hm2, 0.037 5-0.004 7 kg/hm2 and 0.012 2-0.012 8 kg/hm2, respectively. Peak values of major pollutant concentrations usually precede the flow peak. First flush effect of rainfall runoff from two study catchments is no obvious, which can be reflected by the low mean value of FF30 of TSS, COD, TP and NO-3-N, with 36.26%, 26.13%, 28.13% and 39.03%, respectively. Based on multivariate statistical analysis, first flush effect from urban lawn rainfall runoff is greatly influenced by total rainfall amount (Tr) and total runoff volume (V).