3.4.1 Turbidity
The Turbidity of the water, monitored from 2000 to 2007, before the work
was carried out (BEFORE - T1), presented average values of 192 NUT
(Nephelometric Units of Turbidity), against the average values of 102
NUT, for the period from 2008 to 2018, after the completion of the work
(AFTER - T2), representing a 53% drop in the average values. For the T1
treatment, the average values of February and December were higher than
the Conama standard of 100 NUT (Conama, 1986) (Figure 3A). In the T2
treatment, the average values were 102 NUT, except for February 2009,
2014, 2017 and 2018; October 2009, 2012 and 2018; December 2009 and 2015
(Figure 3B).