ANALYSIS OF LITHOLOGIES ASSOCIATED WITH WATER INFLOW IN TUBULAR WELLS IN THE SERRA GERAL AQUIFER SYSTEM (RS)
DOI:
https://doi.org/10.14393/RCG2610877812Keywords:
Discharge, Tectonic structures, Volcanic rocks, Fractured aquiferAbstract
The groundwater belonging to the Serra Geral Aquifer System (SGAS) is the primary source of water supply for many municipalities in the northeast of the state of Rio Grande do Sul. Despite its good quality and reasonable water availability, its specificities —such as a fractured, heterogeneous, and anisotropic aquifer —cause significant variations in water productivity. These variations are conditioned by the structures and lithologies that occur associated with the water inflows (WI). Thus, this article aimed to evaluate the relationship between lithologies and productivity in SGAS. The statistical analyses of the lithological groups showed that 49% and 27% of all WI were characterized by the presence of volcanic rocks with vesicular to amygdaloid structures (Group 2) and fractured basalts (Group 4), respectively. The water flow rates (WFR) did not describe a single behavior. Increases and decreases in flow were observed in relation to the characteristics of the WI. In short, the occurrence of different discharges and, consequently, the productivity of the wells (greater transmissivity/specific capacity) depend on the type, quantity, connection, and openings of the existing structures in the SGAS.
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Copyright (c) 2025 Aline Saupe Abreu, Pedro Antônio Roehe Reginato, Tiago de Vargas, Franciéle Schwanck Carlos, Taison Anderson Bortolin, Paulo Salvadoretti

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