4.3.1 Turbidity
The analysis of the turbidity, suspended solids, phosphorus and dissolved organic carbon (Figures: 3 - A, B, C, and D)has demonstrated with confidence that the data from treatment T2 are more uniform or stable, than in T1, for these indicators. Figures 3A and 3B, which refer to water turbidity, express that, in the years that preceded the implementation of the work (T1) and the years that followed it (T2), on average, water turbidity was lower in the months of February and December, in T2.This difference observed in T2 can be explained by the decrease in the supply of sediments in the watercourse. This may be due to 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 restored with conservationist agriculture, through the developed work (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 parameters of turbidity and suspended solids were higher before the implementation of the works. This land use, without adopting conservationist practices, can be considered as the one with the largest potential for erosion.