Estimation of Liaocheng Urban Non-point Source Pollution Load

Based on ArcGIS software as well as remote sensing data of land use and soil classification,the land use map of urban area of Dongchangfu,Liaocheng was generated for the statistics of different land uses.The study area was divided as residential area,traffic area,industrial zone,green land,public construction land and unused land.2009 runoff depth and annual volume of runoff was estimated using SCS runoff curve model by different curve number(CN) values.Results showed that 2009 rainfall runoff depth of different functional divisions in Dongchangfu District,Liaocheng were 272.47 mm,465.00 mm,277.16 mm,30.68 mm,128.47 mm and 167.51 mm respectively.Based on average concentration of different pollutants,the pollutants loads of SS,COD,TN,TP were calculated as 8,558.8 t,2,415.32 t,201.29 t and 10.08 t respectively.