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| Titel |
Prospecting for safe (low fluoride) groundwater in the Eastern African Rift: the Arumeru District (Northern Tanzania) |
| VerfasserIn |
G. Ghiglieri, R. Balia, G. Oggiano, D. Pittalis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 6 ; Nr. 14, no. 6 (2010-06-28), S.1081-1091 |
| Datensatznummer |
250012344
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| Publikation (Nr.) |
 copernicus.org/hess-14-1081-2010.pdf |
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| Zusammenfassung |
| A multidisciplinary research effort, including geological, hydrogeological,
hydro-chemical, geophysical and hydrological investigations, was aimed at
locating a source of safe groundwater for a district of northern Tanzania,
within the western branch of the East Africa Rift Valley, where water
shortage is common and much of the surface water carries unacceptable levels
of dissolved fluoride. The 440 km2 study area lies in the northern part
of Arumeru district and is dominated by Mt. Meru (4565 m a.s.l.). The local
climate is semi-arid, with distinct wet and dry seasons. Four
hydrogeological complexes were identified, occurring within different
volcanic formations, either alone or superimposed upon one another. The
groundwater flow system was interpreted from the spatial distribution of the
springs, combined with a lithology- and geometry-based reconstruction of the
aquifers. The dominant pattern consists of a multi-directional flow from the
higher elevations in the south towards the lower areas in the north, but
this is complicated by structures such as grabens, faults, lava domes and
tholoids. After the identification of the major fluoride source, an
interference pattern between groundwater and high fluoride surface water was
drawn. Finally, vertical electrical soundings were performed to define the
location of aquifers in regions where release of fluoride was prevented. The
methodological approach for the prospecting of safe water in a semi-arid,
fluoride polluted region was validated by the drilling of a 60 m deep well
capable of supplying at least 3.8 l/s of low fluoride, drinkable water. |
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