Related Experiment Video
Updated: Jul 29, 2025

Watershed Planning within a Quantitative Scenario Analysis Framework
Published on: July 24, 2016
A comprehensive review of water quality indices (WQIs): history, models, attempts and perspectives
Sandra Chidiac1, Paula El Najjar1,2, Naim Ouaini1
1Department of Agricultural and Food Engineering, School of Engineering, Holy Spirit University of Kaslik, P.O.Box 446, Jounieh, Lebanon.
Abstract:
Water quality index (WQI) is one of the most used tools to describe water quality. It is based on physical, chemical, and biological factors that are combined into a single value that ranges from 0 to 100 and involves 4 processes: (1) parameter selection, (2) transformation of the raw data into common scale, (3) providing weights and (4) aggregation of sub-index values. The background of WQI is presented in this review study. the stages of development, the progression of the field of study, the various WQIs, the benefits and drawbacks of each approach, and the most recent attempts at WQI studies. In order to grow and elaborate the index in several ways, WQIs should be linked to scientific breakthroughs (example: ecologically). Consequently, a sophisticated WQI that takes into account statistical methods, interactions between parameters, and scientific and technological improvement should be created in order to be used in future investigations.
Related Concept Videos
Quality of Water
Testing Water Quality
Typical Model Studies
Gravimetry: Overview
In precipitation gravimetry, the analyte is converted into a precipitate and weighed. For example, the silver content in a sample can be estimated by precipitating and...
Sampling Plans
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...
Modeling and Similitude

