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.