The quality of water is a measure of a number of characteristics that impact on its condition. Parameters affecting the water quality are classified as having chemical, physical, biological and radiation characteristics. However there is uncertainty as to whether or not a water sample meets set standards in quality if two or more parameters need to be considered. Therefore, this study is to develop an effective evaluation model, adopting fuzzy logic, to assess the quality of water. | Journal of Science and Technology 54 (4B) (2016) 232-239 INTEGRATED EVALUATION MODEL FOR SURFACE WATER QUALITY A CASE STUDY IN HO CHI MINH CITY, VIETNAM Thu Thi Minh Nguyen*, Colin Arrowsmith, David Fraser Royal Melbourne Institute of Technology, GPO Box 2476, Melbourne VIC 3001 Australia * Email: s3455650@ Received: 15th August 2016; Accepted for publication: 10th November 2016. ABSTRACT The quality of water is a measure of a number of characteristics that impact on its condition. Parameters affecting the water quality are classified as having chemical, physical, biological and radiation characteristics. However there is uncertainty as to whether or not a water sample meets set standards in quality if two or more parameters need to be considered. Therefore, this study is to develop an effective evaluation model, adopting fuzzy logic, to assess the quality of water. Using a case study in Ho Chi Minh, Vietnam, a model has been developed and applied the collected surface water monitoring data in 2015. The results obtained from this model are then compared to the results gained from Vietnam national water quality index established in 2011. Keywords: environmental management, surface water quality, water evaluation model, fuzzy logic, water quality index. 1. INTRODUCTION Integrated fuzzy evaluation method has been applied in recent years, This is an assessment approach developed based on fuzzy theory [1], and is able to deal with a number of non-linear relations, simplification, transferring ordinal value to verbal form. It can integrate qualitative and quantitative data, and is capable of dealing with data loss [2]. Evaluation methods based on fuzzy algorithm are applied in many areas such as automatic control, computer science, and environmental management [3, 4, 5 - 7]. In Vietnam, fuzzy logic was applied in many fields of study such as control system [8], fuzzy control [9], computer science [10], GIS system [11, 12], integrated algorithm [13]
