en Environmental Health, Sciences, and Engineering Environmental Health, Sciences, and Engineering پژوهشي Original Article <p><span style="font-size:14px;"><span style="font-family: times new roman;"><strong>Background: </strong>Qual2k is a stream water quality model and was used to evaluate the water quality of the Kine-Vars River and assess the response of the river to nutrient management strategies.<br> <strong>Methods: </strong>For that purpose, 7 sample stations were selected and surface water samples were collected in the winter and summer of 2012 and were analyzed for temperature, dissolved oxygen, biological oxygen demand, ammonia&ndash;nitrogen, nitrate&ndash;nitrogen, organic nitrogen, organic phosphorus, and inorganic phosphorus.</span></span><br> <span style="font-size:14px;"><span style="font-family: times new roman;"><strong>Results: </strong>Results showed that the Kine-Vars River is saturated with N and P and is classified as eutrophic. The simulated data showed that the total nitrogen and total phosphorus loads of the studied river need to be reduced by 76% and 93%, respectively, to reach water quality objectives.</span></span><br> <span style="font-size:14px;"><span style="font-family: times new roman;"><strong>Conclusion: </strong>Application of nutrient control strategies can reduce the nutrient loads significantly but is not sufficient to change the river classification from eutrophic to oligotrophic in a short time; thus, additional nutrient control measures are necessary.</span></span></p> <p dir="ltr" style="text-align: justify;"></p> Qual2k,Modeling, Nutrients,Water Quality, Kine-Vars, Zanjan 1 11 http://jhehp.zums.ac.ir/browse.php?a_code=A-10-39-1&slc_lang=en&sid=1 Mohammad Reza Mehrasbi zmehr@zums.ac.ir 10031947532846009270 10031947532846009270 Yes Department of Environmental Health, School of Public Health, Zanjan University of Medical Sciences, Zanjan, Iran. Zohre Farahmand Kia raof_haghighi@yahoo.com 10031947532846009271 10031947532846009271 No Department of Environmental Health, School of Public Health, Zanjan University of Medical Sciences, Zanjan, Iran.