Evaluation of groundwater resources in the Geba basin, Ethiopia

  • Kibrewossen Tesfagiorgis
  • Tesfamichael Gebreyohannes
  • Florimond De Smedt
  • Jan Moeyersons
  • Miruts Hagos
  • Jan Nyssen
  • Jozef Deckers
Original Paper

Abstract

This article presents an assessment of the groundwater resources in the Geba basin, Ethiopia. Hydrogeological characteristics are derived from a combination of GIS and field survey data. MODFLOW groundwater model in a PMWIN environment is used to simulate the movement and distribution of groundwater in the basin. Despite the limited data available, by simplifying the model as a single layered semi-confined groundwater system and by optimising the transmissivity of the different lithological units, a realistic description of the groundwater flow is obtained. It is concluded that 30,000 m3/day of groundwater can be abstracted from the Geba basin for irrigation in a sustainable way, in locations characterised by shallow groundwater in combination with aquitard-type lithological units.

Keywords

Groundwater modelling Transmissivity Geba basin Ethiopia 

Résumé

L’article présente une évaluation des ressources en eau du bassin de Geba en Ethiopie. Les caractéristiques hydrogéologiques sont établies à partir de données de terrain représentées sur SIG. Le modèle hydrogéologique Modflow est utilisé en environnement Pmwin afin de simuler les écoulements d’eau dans le bassin. Malgré le nombre limité de données disponibles, en simplifiant le modèle en un système aquifère stratifié semi-confiné et en optimisant les transmissivités des différentes unités lithologiques, une description réaliste des écoulements souterrains est obtenue. On conclut que 30 000 m3/j d’eau souterraine peuvent être extraits du bassin de Geba pour les besoins d’irrigation, de façon durable, en des zones caractérisées par des eaux souterraines peu profondes au sein d’unités lithologiques de type aquitard.

Mots clés

Modélisation des eaux souterraines Transmissivité Bassin de Geba Ethiopie 

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Kibrewossen Tesfagiorgis
    • 1
    • 2
  • Tesfamichael Gebreyohannes
    • 1
    • 3
  • Florimond De Smedt
    • 1
  • Jan Moeyersons
    • 4
  • Miruts Hagos
    • 3
  • Jan Nyssen
    • 5
  • Jozef Deckers
    • 6
  1. 1.Department of Hydrology and Hydraulic EngineeringVrije Universiteit BrusselBrusselsBelgium
  2. 2.NOAA-CREST CenterCity College of New YorkNew YorkUSA
  3. 3.Mekelle UniversityMekelleEthiopia
  4. 4.Royal Museum for Central AfricaTervurenBelgium
  5. 5.Department of GeographyGhent UniversityGhentBelgium
  6. 6.Division for Land and Water Management, Department of Earth and Environmental SciencesKU LeuvenLeuvenBelgium

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