1. Physiochemical variable WQIs such as those developed by Canadian Council of Ministers of the Environment (2001).It is worth mentioning that the types of these WQIs depend on the used variables and the ultimate use of the index.2. Biological WQIs such as those developed by Armitage et al. (1983). Biological water quality can be assessed based on different types of aquatic organisms (Terrado et al. 2010).3. Hydro-morphological indices
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