Efeito do uso e ocupação da terra na qualidade da água do Ribeirão Jacutinga

Abstract

The source of surface supply in the municipality of Ibiporã in Paraná is the Ribeirão Jacutinga. With its source located in the city of Cambé, it runs through the entire northern region of the municipality of Londrina to the city of Ibiporã, where it is used in the public supply of the city. Subsequently, this flows into the Tibagi River, the source of supply for the city of Londrina, thus, it stands out for its importance in the north of the state of Paraná. With a total length of approximately 250 km, it runs through the three municipalities between urban and rural areas, interacting with different land uses. In order to evaluate the influence of these different uses on the water quality of Ribeirão Jacutinga, a historical series of data monitored by the National Water Agency (ANA) was analyzed, covering the years 2000 to 2022. Limnological indicators such as, hydrogen potential, dissolved oxygen, electrical conductivity, total dissolved solids, air and water temperature, as well as microbiological, total coliforms and Escherichia coli. Maps of land use and occupation were prepared in order to obtain a possible relationship between these data obtained with the limnological and microbiological variables analyzed. It was concluded that there was an increase in agricultural activity over the years, more specifically an expressive growth in areas associated with soybean cultivation, between 2012 and 2018, which may have been a factor that impacted the quality of this water body. in this time interval. Considering the area comprising the Ribeirão Jacutinga Watershed, this increase represented approximately 44% of its totality. Analyzing the Water Quality Index (WQI) between the years 2020, 2021 and 2022, reasonable rates were obtained, which may indicate that this water body has not suffered significant influences caused by urban and agricultural growth in its basin.