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Transforming Complex Water Quality Monitoring Data into Water Quality Indices

Nashwa A. Shaaban () and David K. Stevens
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Nashwa A. Shaaban: Alexandria University
David K. Stevens: Utah State University

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2025, vol. 39, issue 8, No 14, 3883-3899

Abstract: Abstract Unplanned urbanization and economic development can deteriorate water quality (WQ) and alter its beneficial usage. Continuous monitoring of biotic and abiotic parameters describing the WQ is essential to track changes and classify water resources to protect public health. Various invest significant effort, money, and time in monitoring programs. Using data from those sources is challenging due to the large number of observations, and inconsistencies in sampling time, date, stations, and gaps. This study aims to design different water quality index (WQI) models to provide policymakers, stakeholders, and water managers with a more comprehensive assessment by converting complex datasets from over 10 years, processed with the statistical software R, into consistent data sets. These datasets are then transformed into small principal components. WQ datasets of lakes and reservoirs in the western USA were chosen as case studies. The strategy of data processing is explained, and the results organized as a descriptive summary of the 12,000 observations for 31 parameters are discussed. Outputs of principal component analysis (PCA) are used to create relative and absolute WQI models for water irrigation usage and protecting cold- and warm-water species of game fish. Weighted arithmetic water quality indices are applied, and the relation between different models is examined.

Keywords: Water quality index (WQI); Principal component analysis (PCA); Data processing; Lakes; Reservoirs; Weighted arithmetic water quality index (WAWQI) (search for similar items in EconPapers)
Date: 2025
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DOI: 10.1007/s11269-025-04135-4

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