Construção e mapeamento de índice de qualidade de águas subterrâneas em Porto Velho

Abstract

This work was carried out an area about 100 km2 in the urban perimeter of the municipality of Porto Velho - RO, where samples of groundwater of 119 wells were collected; Whose main objective was the elaboration of a groundwater quality index (IQAS). For this study, 24 variables (Electrical Conductivity, ORP, TDS, Salinity, Bicarbonate, Air Temperature, Water Temperature, Turbidity, Sulphate, Chloride, Water Hardness, Resistivity, Static Level, Ca Ion, pH, Nitrate, OD, M Ion (??), Na Ion, Ammonia Ion, Fe ion, Fluor, Mn Ion and K Ion), which were obtained from secondary data of the Brazilian Geological Survey (CPRM). The information on the contents of the studied parameters were analyzed in electronic spreadsheets where they received critical and statistical validation. From the mathematical relationships, the IQAS values were calculated using the factorial analysis technique, where it was identified that the variables that most influenced in its formation were Salinity, Electrical Conductivity, TDS, Chloride, Water Hardness and Calcium. From the IQA calculated for each sample, the ordinary kriging technique was applied to produce the IQAS thematic map. With the results of this research it was possible to identify the demographic densification zones of the urban perimeter of Porto Velho with a higher or lower index of groundwater quality.