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Accueil du site → Doctorat → Autriche → Hydrogeological investigation and environmentally sound plans for the development of groundwater in the Weri River Basin, Tigray, Ethiopia.

Universitaet fuer Bodenkultur Wien (2003)

Hydrogeological investigation and environmentally sound plans for the development of groundwater in the Weri River Basin, Tigray, Ethiopia.

Nata Tadesse tafesse

Titre : Hydrogeological investigation and environmentally sound plans for the development of groundwater in the Weri River Basin, Tigray, Ethiopia.

Auteur : Nata Tadesse tafesse

Akad. Grad : Thesis. Doctoral 2003

Université de soutenance : Universitaet fuer Bodenkultur Wien ; Institut fuer Angewandte Geologie

Résumé
The Weri River Basin is located in the northern part of Ethiopia. It is a closed basin covering an area of 5384.24 km2. The main objective of this study was to evaluate the groundwater potential of the basin. Hydrometeorologic data from four stations were used for determining the hydrological balance of the basin. The average annual rainfall of the basin is 686.16 mm. Calculated annual actual evapotranspiration is 80 % of the annual rainfall. The discharge flowing in the Weri River is the runoff from the basin drained by it, and the mean annual runoff is 591.11 million m3. Annual discharge for domestic and non-domestic uses in the basin is 4.8 million m3. The total amount of water which is actually available to recharge the groundwater circulation within the hydrological basin is 167.88 million m3 per year. On the basis of the relationship between hydraulic properties and geology, the different rocks and unconsolidated sediments in the study area have been classified into four classes from moderate (50 ; T (m2/day) ; 500) to weak (0.5 ; T (m2/day) ; 5) potentiality aquifers. In the basin, no geological formation reaches a high potentiality class. Partial collapses of boreholes are the only environmental problems that have occurred associated with groundwater development in the basin. Two other environmental problems may occur as a result of using the basin’s groundwater from the different aquifers without good water management plans. The first problem is rapid groundwater depletion, and the second is land subsidence that occurs as a result of over-abstraction of groundwater in the alluvial covered areas. At present, the amount of natural recharge in the basin is more than the abstraction. The problem is not lack of water ; it is rather absence of or poor management. This is mainly due to lack, at the regional level, of efficient groundwater management organization which is well equipped with adequate legislation, funding and infrastructure. It is therefore necessary to establish an efficient regional groundwater management organization which can conduct detailed groundwater management studies of the basin and also effectively implement and follow the objectives of the national water resources management policy.

Mots clé : Hydrogeologie / Grundwassernutzung / Wasserqualität — Hydrogeology / Groundwater Management / Water quality

Présentation : Österreichische Dissertationsdatenbank

Page publiée le 27 mai 2008, mise à jour le 13 mars 2019