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In the Maranhao community, the waters had better WQI levels, but the results of Vila do Conde show degradation of the quality of the underground waters consumed, reflecting the same characteristics of the aquifers used to supply the population.
A Water Quality Index (WQI) is a very useful and efficient method for assessing the quality of water (Asadi, Vuppala, & Reddy, 2007).
The total WQI (Whitley & Putzier, 1994) and PKPCT, Version 11 (Barrett, 1983) scores were used in Pearson product moment correlations with stress and its four manifestations.
Considering the variables that compose the Water Quality Index (WQI) on the Sinos River basin(SRB) and how they are influenced by actions such as increase of industrial and domestic wastewater treatment, improve legal systems and law enforcement, conservation or recovery of the gallery forest, wetlands and swamplands areas.
The pH value was classified as Class II according to the Water Quality Index (WQI) of Malaysia .
The water quality of Malaysian rivers is primarily monitored based on the water quality index (WQI) developed by the Department of Environment using six physicochemical parameters, namely, dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), ammoniacal nitrogen (N[H.sub.3]-N), total suspended solids (TSS), and pH.
Water Quality Index (WQI) is a technique to assess the suitability of drinking water quality. It is a technique to rating the influence of individual water quality parameters on the overall quality of water for human consumption.
These values are then used to estimate the final index number, .Water Quality Index (WQI) may be defined as the rating that reflects the combined effect of a number of water quality factors on the comprehensive quality of water.
Malaysian Environmental Quality Reports of 2000 recorded that the Water Quality Index (WQI) showed both rivers were still polluted (WQI Class III,IV,V 51.9-76.5) and required extensive treatment and sufficient SWM qualities and quantities .
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