INFLUENCE OF LAND USE AND COVER ON THE POTENTIAL OF RENAL ACID LOAD (RALP) OF RAW WATER: A STUDY IN THE HYDROGRAPHIC BASINS THAT MAINTAIN THE PUBLIC SUPPLY SYSTEM IN THE TOWN TANGARÁ DA SERRA- MT

Abstract

The study evaluates the relationship between soil use and coverage and the Renal Acid Load Potential (RALP) of the three raw water collection points for public supply in the municipality of Tangará da Serra, Mato Grosso, namely the Sepotuba River and Russo and Queima- Pé streams. The maps were prepared based on images from the Landsat-8 satellite from 2021, with cropping and classification of land use and occupation. Raw water samples were collected from these three catchment points during a complete hydrological cycle. Results of each sample, based on the analysis of certain variables, were applied to the RALP algorithm (SO₄²-, CL^-, K⁺, Mg⁺², Na⁺ e Ca⁺²) and through Pearson’s correlation (r) compared with the three largest areas (%) of use and coverage (agriculture, forest, and urbanization). Land use and occupation influence RALP values, as does the rainfall regime. Agriculture and urbanization provide an increase in RALP values, mainly during the rainy and dry periods, respectively. When the soil is occupied by forest, there is a reduction in RALP values, with no accumulation of phosphorus, potassium, calcium, magnesium, chlorides, sulfates, and sodium in the water, indicating that these components are of anthropogenic origin.