Fuzzy Comprehensive and Division Evaluation of the Groundwater Quality

Comprehensive evaluation of the shallow ground drinking water is carried out according to principle of the fuzzy comprehensive evaluation,technology of MapGis and Sufer.First,the 14 water samples were collected and their experimental analysis were carried out,the detection value of eight indexes(nitrate,coliform group,total bacteria,Fe,permanganate index,Mn,fluoride,chloride) is obtained.Membership functions are determined according to maximum membership degree law to calculate the values of membership degree.Then,the weights of the evaluation index are determined based on entropy method.According to the values of membership degree and the weights,the result of comprehensive evaluation is obtained by using fuzzy transformation theory.At last,comprehensive evaluation division map of the water quality is drawed by using MapGis and Sufer.The study shows that coliform group,total bacteria and Fe are the main pollutions of the shallow ground drinking water in the Qingyuan;about 1/3 shallow ground drinking water is not suitable for the life's drinking.