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Water quality index using multivariate factorial analysis

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Figure 1.  Hydrological map of the Rio das Pedras Watershed and the water sample collection points
Table 1.  Basic descriptive statistics of the eight variables being studied at the six sampling points from September/2003 to September/2004
Figure 2A  shows  the  variation  of  the  calculated  WQI value  for the  six points monitored  over the  collection   pe-riod, and the corresponding values for pluviometric  precipi-tation

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