Comparation and Application of Water Environmental Quality Assessments——The case study on Tongdian River in Lanping Conmty

The artical compares individual pollution index,Nemero comprehensive index and osculating method of surface water in the application of environmental assessment.By assessing the water quality monitoring sections of Tongdian River in Lanping and appraising each sections water environmental quality based on five main heavy-metal pollutions(Cd,Cu,Pb,Zn,Mn),we can point out the advantages and disadvantages of the three environmental assessment mentioned above and analyze each ones value of practical application as well as its value of theoretical investigation.