GEOLOGY AND HYDROGEOCHEMICAL ANALYSIS OF GROUNDWATER IN THE PARDO RIVER WATERSHED, SOUTHERN BRAZIL: A CASE STUDY
DOI:
https://doi.org/10.14393/RCG2510171428Keywords:
Hydrogeology, Hydrostratigraphy, PRE-Guarani Aquifer, Guarani Aquifer System, Serra Geral Aquifer SystemAbstract
Groundwater reserves are strategic sources for public water supply. This regional study, accompanied by geomorphologic, geologic, and hydrostratigraphic maps, highlights the importance of stratigraphic and hydrochemical research in preserving water in areas susceptible to contamination, such as aquifer recharge zones. The aquifers were subdivided into the Pre-Guarani Aquifer System (PRE-GAS), the Guarani Aquifer System (GAS), and the Serra Geral Aquifer System (SGAS). This article paper analyzed the hydrogeological characteristics of the Pardo River watershed, focusing on the lithostratigraphic units of the Rosário do Sul Group (PRE-GAS), the Botucatu Formation (GAS), and the Caxias and the Gramado facies of the Serra Geral Formation (SGAS) present in the study area. In terms of hydrogeochemistry, the water from the wells was classified as sodium bicarbonate in the PRE-GAS, and as calcium bicarbonate in the GAS and SGAS. The average specific capacity of the 102 wells analyzed was 0.72 m3/h/m for the PRE-GAS, 1.76 m3/h/m for the GAS, and 0.44 m3/h/m for the SGAS. The use of the public domain SIAGAS database is recommended, but it requires proper validation and standardization. The study reinforces a sustainable approach to ensure the long-term availability of groundwater resources in the region.
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Copyright (c) 2024 Marco Antonio Fontoura Hansen, Henrique Carlos Fensterseifer, Cesar Augusto Moreira, Felipe Guadagnin, José Pedro Rebés Lima
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