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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Date
2016-01
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Addis Ababa Universty
Abstract
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
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Keywords
VES soundings, Magnetic technique, Aquifer