This thesis work deals with the regional interpretation of electrical resistivity sounding, survey,rncarried out in the Becho plain, Southwest Showa. The principal objective is to study the groundrnwater conditions such as depth to the water table, thickness and lateral boundaries of aquiferrnand possible flow direction. Parametric Transient Electromagnetic, sounding were alsornconducted at test borehole sites for calibration and comparison purpose. The geophysicalrnsurvey was part of an integrated geotechnical work conducted by Water Works Design andrnSupervision Enterprise.rnThe focus of this thesis work is interpretation thirty-one Schlumberger soundings with arnmaximum current electrode spacing ranging from 1.5m to1000m, from Becho plain and thernsurrounding area, and one Transient electromagnetic sounding, at Asgorie test well site.rnInterpretation of these soundings indicates the presence of a likely alluvial aquifer of 240mrnmaximum depth and other water-bearing volcanic rocks, at the SW boarder the Becho plain.rnThese volcanic aquifers show variable thickness and formation resistivity depending onrncomposition and degree of saturation.rnPossible fault line is indicated in the eastern central part of the survey area and intrusion ofrnvolcanic rocks is identified near to the boarder line of southern part, possibly it may be thernweak zone. In general, four geoelectrical layers are identified in this thesis work. These are therntop layer, alluvium, aquifer and bedrocks. The top layer consists of mostly clay and silt. Thernalluvial consists of unconsolidated sediment such as sand, gravel and silt. The aquifer consistsrnof unconsolidated sediment such as gravel, silt and in some part the basalt. The bedrock isrnconsists of mostly basalt, ryyolite, and ignimbrite and fracture basalt