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

Background & Aims of the Study: The use of qualitative indicators is one of the ways ofwater quality of river water. The purpose of this study is Khorramrood River ofKhorramabad of water quality using water quality index (NSFWQI) and GIS that is aGeographic Information System.Materials & Methods: In this cross-sectional study, qualitative parameters needed tocalculate NSFWQI index that including pH, dissolved oxygen, total dissolved solids,biochemical oxygen demand, turbidity, temperature, phosphate, nitrate and fecal coliformsix months of 2012 at six stations using were measured using standard methods. For Riverzonation was used GIS software.Results: Results showed that the highest index of NSFWQI in the first station wasobserved 82 and the lowest was 42 in the sixth station. Average scores on the six months ofthe study was equal 58.05 and the river water quality based on the median of six months inthe classes of water quality was average. The first station to the last station before going tomore water pollution and the numerical values of the parameters are reduced.Conclusions: Based on the average results of the study, the water quality was good at thefirst stations and the second, third, fourth was average, and was bad at fifth and sixthstation. Indices studied by describing the state of water quality of sampling stations duringthe study period, it was provide the possibility of decision for the relevant authorities abouthow water is used in different parts of it.