Avaliação da qualidade de água do sistema Aquífero Serra Geral por meio do IQASB adaptado no município de Chapecó-SC

Abstract

The objective of this paper was to evaluate the quality of groundwater of the Serra Geral Aquifer System under the Chapecó-SC city by applying an adaptation of the Quality Index of Raw Groundwater Quality Index - IQASB and characterizing it spatially from the parameters thermotolerant coliforms, iron, manganese, chloride, hardness, fluoride, pH, sulfates, turbidity and nitrate, through the Inverse Distance Weighted (IDW) function. Published data were used to determine the IQASB for the different regions of the municipality. An adaptation was carried out to the best representation of the land use and occupation and the hydrogeological characteristics of the study region to be achieved.IQASB was determined for 100 wells, equally divided between rural and urban areas. Of these, 11 presented a very poor classification due to the presence of thermotolerant coliforms in 100 mL of sample. The remaining wells obtained groundwater between good and excellent classes. With the IQASB spatialization it was possible to verify the good quality of the underground water of the Serra Geral System in the city of Chapecó, presenting regions with an inferior to good class good only near the wells with presence of thermotolerant coliforms. The IQASB adaptation was considered effective and a good management tool for the hydric resource, but the adoption of glyphosate, BOD and ammonia is recommended for a better representation of the land use and occupation in the region.