Assessment of water quality status in Baoji section of Weihe river

In order to understand the water pollution status of Baoji in dry season,the Weihe River and the three main tributaries such as Qingjianghe River,Shibahe river,Jinlinghe River were used as the research objects.The data of the main evaluation parameters COD,TN and TP were determined from 12 monitoring sections.The integrated pollution index method was used to evaluate water quality in four rivers.The conclusions is that all the rivers are serious polluted in dry season,water quality is Ⅴ type water in all rivers.Pollution is caused mainly by nitrogen.Each type of pollutant show obvious trend from upstream to downstream in each river.