Groundwater Resources Potetial Assessment in The Eastern Arid and Semi-Arid Areas of Ethiopia: The Case of Fafan District, Jijiga Area

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Addis Ababa Universty


A combined geophysical data involving secondary vertical electrical sounding (VES) and primary magnetic data were used with a view to determining, mapping and characterizing the subsurface layers and thickness of the overburden as well as anomalous bodies, like faults and fractures, as a means to appraising the groundwater potential in the Fafan Valley, Eastern Ethiopia. Seven northwest-southeast traverses were established from which VES data were acquired at an average station interval of 5Km and four traverses established from which magnetic data were acquired at station interval of about 200m each, the modeling and interpretation results from these were used to delimit the study area into a total of 32 points from where vertical electrical soundings were collected and 209 points from where magnetic points were carried out. For further detailed survey using the Schlumberger electrode array configuration were used for the VES data with its different applied approaches is easy and gives rapid results with high spatial resolution. The sounding data was processed and interpreted using IP2Win, WINRESIST, Surfer (V.10) and AutoCad interpretation softwares, and Geosoft (Oasis Montage) interpretation software for magnetic data. Key words VES soundings; Magnetic technique, Aquifer



VES soundings, Magnetic technique, Aquifer