Water Environment Analysis and Appraisal of Inland Rivers in Lishui Urban Area

Based on water quality monitoring data from 10 control sections of inland rivers in Lishui urban area,Standard Index Method was used to analyze the current water environment and sort major pollution factors.Results suggest that the inland river network is poor in quality with serious eutrophication.Except the slightly better water quality in the Haoxiyan River,the Mingxia River,the Haichao River,and the upper reach of Liyangkeng,other inland rivers suffers from serious pollution with poor rating of GradeⅤ.In terms of major pollution factors and pollution source,total nitrogon and ammonia nitrogen being the largest pollution factors,residents' daily waste,livestock and poultry waste contribute most to river pollution,followed by industrial and agricultural area source pollution.