Integrated Geophysical Investigation for the Evaluation of Ground Water Resources at Ada'a Plain Near Debre - Zeit
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Date
2006-08
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Addis Ababa Universty
Abstract
This MSc thesis work entitled " Integrated Geophysical Investigation for the
Evaluation of Ground Water Resources at ''Ada'a Plain" located in Central Ethiopia,
Oromiya Regional State and bounded approximately between geographic
coordinates of 480000E - 540000 E and 900000N - 980000N.
Multi-disciplinary studies are currently going on at Ada'a Plain for the evaluation of
groundwater potential and design of pressurized irrigation development, by the
Ethiopian Ministry of Water Resources. The work is being undertaken by Water
Works Design and Supervision Enterprise, on consultancy basis. Preliminary
interpretation and conceptualization of the groundwater system of the plain have
been made by the consultant. One of their findings reveals that the regional
hydraulic gradient seams to be affected by some geologic features. One such
possibility is regional scale structure(s), acting as a hydraulic barrier that impedes
the movement of the groundwater.
This integrated geophysical investigation (Vertical Electrical Soundings/VES and
magnetic methods), as part of a research project for MSc dissertation, was carried
out to verify the inferred groundwater barrier and its possible connection to the
linear geologic structures. Moreover, it also aims at establishing the hydro-
Stratigraphy of the plain. The magnetic survey was found to be useful in
lithologic mapping and identifying linear geologic features. On the magnetic map,
NW-SE trending anomalies are in conformity with the anticipated groundwater
barrier. However, the inferred groundwater barrier (the main target of the
geophysical survey) was not detected and mapped by the resistivity method.
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Ada'a Plain