Groundwater Resources Potetial Assessment In The Eastern Arid And Semi-arid Areas Of Ethiopia The Case Of Fafan District Jijiga Area

A combined geophysical data involving secondary vertical electrical sounding (VES) andrnprimary magnetic data were used with a view to determining, mapping and characterizing thernsubsurface layers and thickness of the overburden as well as anomalous bodies, like faults andrnfractures, as a means to appraising the groundwater potential in the Fafan Valley, EasternrnEthiopia. Seven northwest-southeast traverses were established from which VES data werernacquired at an average station interval of 5Km and four traverses established from whichrnmagnetic data were acquired at station interval of about 200m each, the modeling andrninterpretation results from these were used to delimit the study area into a total of 32 points fromrnwhere vertical electrical soundings were collected and 209 points from where magnetic pointsrnwere carried out. For further detailed survey using the Schlumberger electrode arrayrnconfiguration were used for the VES data with its different applied approaches is easy and givesrnrapid results with high spatial resolution. The sounding data was processed and interpreted usingrnIP2Win, WINRESIST, Surfer (V.10) and AutoCad interpretation softwares, and Geosoft (OasisrnMontage) interpretation software for magnetic data.rnKey words VES soundings; Magnetic technique, Aquifer

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