4.2.1 Turbidity
Analysing the turbidity data, suspended solids, phosphorus and dissolved
organic carbon (Figures: 3 - A, B, C, and D), it ensures that the data
from treatment T2 are more uniform or stable than in T1 for these
indicators. When analysing Figures 3A and 3B, related to water
turbidity, in previous years the implementation of the work (T1) and
after the implementation of the work (T2), it observes that, on average,
water turbidity was lower in February and December when we compare (T2)
with the situation before the implementation of the work (T1). This
difference seen in T2 can be explained by the decrease in the supply of
sediments in the watercourse. It happened because of the effects of the
change in soil management with the adoption of conservationist practices
and erosion control through the implementation of technical projects at
the 228 properties that were recovered with conservationist agriculture,
through the work performed (Figures 2B, 2D, 2E, 2G, 2I, 2K, 2M and 2O).
A similar result was found by Souza & Gastaldini (2014), who observed
that land use significantly influenced the water quality parameters. In
areas considered to have a higher percentage of agriculture and with
problems related to erosion, the situation of the area before the
implementation of constructions, the parameters of turbidity, suspended
solids are higher. This land use, without adopting conservationist
practices, can be considered as having the biggest potential for
erosion.