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How are water quality indexes calculated?

Support vector machine

Principal component analysis

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Gradient boosting

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Water quality indexes are calculated by integrating the values of multiple water parameters into a single value, which reflects the overall quality of water. Different methods and formulas are used to calculate water quality indexes, and these methods can vary from country to country. Some methods use three, six, or even more than six parameters to calculate the index. Traditional methods of calculating water quality indexes did not include microbial parameters, leading to the development of various new methods, including fuzzy logic-based approaches. Machine learning algorithms, such as Decision Tree (DT) classifier, Support Vector Machine (SVM), and Random Forest (RF) classifier, have also been applied to estimate water quality indexes. These algorithms handle large datasets effectively and efficiently, providing accurate predictions.

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Open access•Posted Content•DOI Comparative Analysis of Machine Learning Models for Prediction of Surface Water Quality 26 Jun 2023	The paper states that the Water Quality Index (WQI) was calculated using MATLAB and Simulink software based on formulas and standard values from the Bureau of Indian Standards.
Open access•Journal Article•DOI Water quality prediction and classification based on principal component regression and gradient boosting classifier approach David Schmidtz 01 Sep 2022-Journal of King Saud University - Computer and Information Sciences 13 Citations	The paper mentions that the water quality index (WQI) is calculated using the weighted arithmetic index method.
Journal Article•DOI Water quality Index Assessment of the Groundwater of Industrial area and absorption by Polymer Composites 01 Jan 2023-International journal of research and innovation in social science	The paper does not provide information on how water quality indexes are calculated.
Book Chapter•DOI Commonly Used Methods to Calculate Water Quality Indices Clement Kiprotich Kiptum 11 Mar 2022	The paper provides formulae for different methods to calculate water quality indices, including methods that use three, six, or more parameters.
Proceedings Article•DOI The Use of Machine Learning Algorithms for Evaluating Water Quality Index: A Survey and Perspective 01 Oct 2022	The paper does not provide information on how water quality indexes are calculated.

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