Abstract
ABSTRACT Arumeru district (northern Tanzania) has limited low-fluoride surface water sources for domestic use. Information on the alternative source, groundwater, is also limited in terms of occurrence and quality. Thus, resistivity data in conjunction with hydrochemical data (fluoride, F−; total dissolved solids, TDS; and electrical conductivity, EC) and lithological logs were used to delineate groundwater zones with contrasting quality in the fluorotic zone. The results reveal a thin upper aquifer (~25 m thick) and a lower major aquifer (>100 m thick). Resistivity of 35–60 Ωm represents fresh groundwater hosted in weathered and fractured mafic volcanics, tuffs and breccias. Resistivity of 25–35 Ωm indicates intermediate groundwater quality, whereas resistivity of 15–25 Ωm indicates low groundwater quality (TDS >1000 mg/L, F− >10 mg/L) hosted in lahars. The results have been integrated to develop a groundwater potential index map, to guide local communities, water authorities and government in the planning and development of groundwater resources in the region.
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