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Hydrographic basins are territory portions where it is possible to establish the interfaces of constituent elements of landscape (climate, vegetation, soils) and how anthropic intervention modifies the environment. The water quality in hydrographic basins is intimately connected to the usage of soil and type of handling to which the cultures are subjected to. The present study aimed to quantify the water quality of the micro basin of Corrego Fundo, Ourinhos (SP), which went through interventions during the Hydrographic Micro Basin State Program (PEMBH). Through parameters such as pH, electric conductivity, temperature, turbidity and dissolved oxygen, we compared the water quality in the beginning of the program in 2008, and four years later, in 2012. The results presented differences, mostly regarding dissolved oxygen quantity in the water. Problems such as the lack of riparian forest on the surroundings of watersheds and the presence of intensive cultivation, like sugarcane and maize, potentiated the entrainment of sediment and nutrients inside the drainage channel. This ends up favoring the growth of aquatic plants, which consume most of the dissolved oxygen in the water, and consequently decreases the downstream water quality.

Monitoring of water quality patterns in the Córrego Fundomicro basin, Ourinhos/SP and effects of the state plan of hydrographic micro basins