Avaliação hidrogeoquímica das águas superficiais e subterrâneas na região sudoeste da bacia do rio Subaúma, Bahia

Paulo Henrique Prado Stefano, Sillas Alves de Cristo, Ivan Pastro Gomes, Mirna Marierse Nepomuceno Santos


This study had as objective to evaluate groundwater and surficial water in Subaúma River Basin, which includes the cities of Alagoinhas, Aramari and Inhambupe, Bahia State. Nine tubular wells were selected in the region, including houses and public places such as schools and public buildings. In addition, six samples of surface waters were analyzed along the river, and the first one was collected close to the river source and the last one downstream from the village of Riacho da Guia. Parameters were analyzed as: pH, color, turbidity, iron (Fe), manganese (Mn), ammonia (NH3), nitrate (NO3 -), nitrite (NO2 -), total dissolved solids (STD), hardness, sodium (Na), potassium (K), magnesium (Mg), calcium (Ca), phospor (P), fluoride (F-), sulfate (SO4), chloride (Cl-), dissolved oxygen (OD), bicarbonate (HCO3 -) and carbonate (CO3 2-). The groundwater was classified mostly as sodium chlorate, with the Na and Cl ions with higher abundance. The surface waters showed a significant anthropic contamination, which increases downstream in the Basin. The high levels of iron in both surface water and groundwater were attributed to the iron contained in Formation Barreiras. Finally, the waters of the basin can be used for irrigation purposes without great restrictions.


Hydrogeology; Surface water; Groundwater; Physico-chemical Analysis.

DOI: http://dx.doi.org/10.21715/GB2358-2812.2019332188


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