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19.01.2017 | Report

Regional groundwater flow modeling of the Geba basin, northern Ethiopia

verfasst von: Tesfamichael Gebreyohannes, Florimond De Smedt, Kristine Walraevens, Solomon Gebresilassie, Abdelwassie Hussien, Miruts Hagos, Kassa Amare, Jozef Deckers, Kindeya Gebrehiwot

Erschienen in: Hydrogeology Journal | Ausgabe 3/2017

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Abstract

The Geba basin is one of the most food-insecure areas of the Tigray regional state in northern Ethiopia due to recurrent drought resulting from erratic distribution of rainfall. Since the beginning of the 1990s, rain-fed agriculture has been supported through small-scale irrigation schemes mainly by surface-water harvesting, but success has been limited. Hence, use of groundwater for irrigation purposes has gained considerable attention. The main purpose of this study is to assess groundwater resources in the Geba basin by means of a MODFLOW modeling approach. The model is calibrated using observed groundwater levels, yielding a clear insight into the groundwater flow systems and reserves. Results show that none of the hydrogeological formations can be considered as aquifers that can be exploited for large-scale groundwater exploitation. However, aquitards can be identified that can support small-scale groundwater abstraction for irrigation needs in regions that are either designated as groundwater discharge areas or where groundwater levels are shallow and can be tapped by hand-dug wells or shallow boreholes.

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Titel: Regional groundwater flow modeling of the Geba basin, northern Ethiopia
verfasst von: Tesfamichael Gebreyohannes
Florimond De Smedt
Kristine Walraevens
Solomon Gebresilassie
Abdelwassie Hussien
Miruts Hagos
Kassa Amare
Jozef Deckers
Kindeya Gebrehiwot
Publikationsdatum: 19.01.2017
Verlag: Springer Berlin Heidelberg
Erschienen in: Hydrogeology Journal / Ausgabe 3/2017
Print ISSN: 1431-2174
Elektronische ISSN: 1435-0157
DOI: https://doi.org/10.1007/s10040-016-1522-8

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