Hydrogeology Of Debre Zeit Area

The investigated area is located east of Addis Ababa on thernwestern border of the main Ethiopian rift valley * Beingrnpart of the Ethiopian rift system , it is characterized byrnPlio-Quaternary volcanism which gave rise to trachytic- domes,rnrhyolitic flows , and rhyolitic ignimbrites in the highlyrnelevated part of the area while olivine basaltic flows andrnsurge deposits in the lower elevated plain area . Thernmaximum point in the area is represented by Mt . Yerer with anrnelevation of 3100 m above sea level. The plain area hasrnan average elevation of 1900 m above sea level .rnThe yearly minimum possible rainfall average in the area isrn859.9 mm , the actual and potential evapotranspiration isrn606 , 2 and 857.1 mm respectivly and the runoff thatrnleaves the basinis 25 . 568 x 10d m3rn«of water. From theserndeterminations, the amount of infiltrated water in the area isrn

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