Evaluation of River Water Quality using NSFWQI and GIS: A case study of Khorramrood River in Khorramabad, Iran

of the Study: The use of qualitative indicators is one of the ways of water quality of river water. The purpose of this study is Khorramrood River of Khorramabad of water quality using water quality index (NSFWQI) and GIS that is a Geographic Information System. In this cross-sectional study, qualitative parameters needed to calculate NSFWQI index that including pH, dissolved oxygen, total dissolved solids, biochemical oxygen demand, turbidity, temperature, phosphate, nitrate and fecal coliform six months of 2012 at six stations using were measured using standard methods. For River zonation was used GIS software. Results showed that the highest index of NSFWQI in the first station was observed 82 and the lowest was 42 in the sixth station. Average scores on the six months of the study was equal 58.05 and the river water quality based on the median of six months in the classes of water quality was average. The first station to the last station before going to more water pollution and the numerical values ​​of the parameters are reduced. Based on the average results of the study, the water quality was good at the first stations and the second, third, fourth was average, and was bad at fifth and sixth station. Indices studied by describing the state of water quality of sampling stations during the study period,it was provide the possibility of decision for the relevant authorities about how water is used in different parts of it