This manuscript presents the results of geophysical data analysis fromrnAda'a plane with a primary objective of characterizing majorrnsubsurface structures and their connection to the subsurfacernhydraulic system. Towards this end, verifying a barrier, inferredrnthrough preliminary interpretations and conceptualizations of thernground water system in the plane by Water Works Design andrnSupervision Enterprise (WWDSE), was the primary task of this work.rnAda'a ground water is located in the southern Awash Basin, OromiyarnRegional State, between geographical coordinates of 38050'E - 39015'Ernand 8030'N - 8045'N.rnThe geophysical data set employed in this project includes: thernpotential field methods namely Gravity and Magnetics and are used torninvestigate major subsurface structures. The other method foundrnadequate for this study is the electrical resistivity method as it is usedrnto evaluate ground water potentials.rnRegional and residual Bougeur anomaly contour maps revealed largernscale regional subsurface structures that align along the rift and smallrnscale, local subsurface structures showing different orientation. Thernresidual feature with a discordant structural alignment shows spatialrncorrelation with the expected subsurface barrier. The total fieldrnmagnetic contour map also confirms this indication and gave furtherrnevidence for the existence of such anomalous feature in the area ofrninterest A depth-slice stack map of apparent resistivity of fifty VES data alsornmanifested a subsurface feature that coincide to the anomaly revealedrnby the residual gravity map. Deep, low apparent resistivity responses,rnwhich can safely be interpreted as water saturated, aquifer zones, arernseparated by a high resistivity, elongated feature. This feature couldrnrepresent an impermeable dry rock units related to domes and conesrnof intermediate magma that can possibly impede the ground waterrnmovement.rnInversion of 2D electrical resistivity imaging data gave a clearrnsubsurface picture and depicted the geo-electric substratum, which isrna resistive dry bottom, to rise above the expected water table at thernspeculated region. Though it falls short to cover the lateral extensionrnof the inferred barrier, it presented strong evidence that supportsrnfindings from the other methods. A 1D apparent resistivity pseudosectionrnalong VESs 54,55,56,58 and 59 reflect the geologic reality asrnthey traverse across a high resistive formation where the barrier isrnexpected lying and complement the results of the 2D analysis