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Addis Ababa University (2007)

Hydrogeological and Hydrogeochemical Assessment in the Adama (Nazareth)-Dera Area, Centeral Ethiopia

Taye, Abera

Titre : Hydrogeological and Hydrogeochemical Assessment in the Adama (Nazareth)-Dera Area, Centeral Ethiopia

Auteur : Taye, Abera

Université de soutenance : Addis Ababa University

Grade : Master of Science in Hydrogeology 2007

Résumé partiel
The investigated area, Nazareth-Dare sub-casement is located in the central part of the Main Ethiopian Rift within 80 09’24.58’’ to 80 36’28.75’’N latitude and 390 08’36.70’’to 390 27’47.23’’E longitude and covers about 941 km2. This research work assesses the hydro geological and hydroelectrically nature of the area based on the analysis of hydro petrology, hydrology, hydro geology and hydro geochemistry data. The assessment and interpretation of the chemical analysis of the previous works and the current works are made to accomplish this objective. The area has semi-arid to semi-humid climate with a mean annual temperature and precipitation of 21.470C and 807mm respectively. The study area has both flat and rugged topography. The annual potential transpiration and actual transpiration of the area are calculated to be 1979.1mm and 726.55mm respectively. The total annual estimated runoff value that leaves the casement area is to be 175.72MCM. In the study area the direct groundwater recharge from precipitation is negligible. Instead, there is huge amount of groundwater recharge from Koka Lake, which is inflow for the study area to be 485.4 MCM/annum. Values of net annual groundwater recharge estimate is determined from water balance calculation and found to be 298.36 MCM. Concerning the hydro ornithological characteristics of the area, there are four hydro ornithological units which are grouped as high to very high, Moderate to high, low to moderate and low to very low permeability groups.

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