Use of Different Water Quality Indexes for Puriification of Water, Case Study; Atrak river

There are different mathematic methods to analysis and interpretation of water quality characters but water quality index is simple method and have several application. For investigation of water quality of Atrak river in golestan province, 6 stations for measuring of water quality in this river considered and measuring the water quality parameters has done in 3 times. Classification of water quality of this river has studied by NSFWQI, BCWQI index and said simple management methods. The Indexes show that except Ghazanghaye station that has good condition of water quality, the other stations have average conditions. The NSFWQI Index result show that most of stations have suitable condition and base on Said method, trivial management changing is necessary. Thus results of this two methods are alike but the result of BCWQI Index method that show from suitable to bad conditions, is stuffy.