Title: Proposing the minimum and maximum probable water quality indices for better water quality management in poor and underdeveloped countries (case study: Bilghan intake)

Authors: Ali Dehnavi; Pardis Goudarzian

Addresses: Department of Civil Engineering, Civil and Transportation Faculty, University of Isfahan, Isfahan 81746-73441, Iran ' Faculty of Desert Studies, Semnan University, Semnan, Iran

Abstract: Increasing measurements costs for surface water quality assessment besides the need for continuous measurements will cause a dilemma in poor countries. Therefore, a new method is proposed to identify and predict minimum probable water quality index (MIP-WQI) and maximum probable WQI (MAP-WQI) values instead of the traditional ones by combining available WQI data and Taguchi method. The water quality data of Bilghan station on Karaj River was used for prediction and comparison of the MIP-WQI and the MAP-WQI. According to the surveys and based on proposed method, the MIP-WQI and the MAP-WQI values based on 2008's data were estimated to be 61.6 and 87.4, respectively. Whereas from 2008 to 2010, actual minimum WQI values were 65.9, 69.8 and 69.3, respectively. In addition, actual maximum WQI values were 83.1, 77.2 and 75.6, respectively. Moreover, these probable indices could be more suitable to be used for water management especially in poor and underdeveloped countries.

Keywords: water quality index; WQI; surface water quality; water quality management; catchment area; empirical index; Bilghan intake; Taguchi method; minimum probable WQI; MIP-WQI; maximum probable WQI; MAP-WQI.

DOI: 10.1504/IJW.2019.101337

International Journal of Water, 2019 Vol.13 No.3, pp.236 - 247

Accepted: 22 Nov 2018
Published online: 30 Jul 2019 *

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