Groundwater Potential Assessment Using Vertical Electrical Sounding and Magnetic Methods: A Case of Adilo Catchment, South Nations, Nationalities and Peoples Regional Government, Ethiopia

Mulugeta Markos,N Nagaprasad,Leta Tesfaye Jule,Krishnaraj Ramaswamy,Abel Saka,Maria Atanassova

doi:10.1155/2021/5424865

Mulugeta Markos, N Nagaprasad + Show 4 more

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https://doi.org/10.1155/2021/5424865

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Abstract

Vertical electrical sounding and magnetic methods were carried out to assess groundwater potential in Adilo catchment, Kembata Tembaro Zone, South Nations, Nationalities and Peoples Regional Government, Main Ethiopian Rift. The data were acquired from eight VES points using Schlumberger electrode arrays with maximum half current electrode spacing ( AB / 2 = 500 ) and 253 magnetic data points were analyzed. The qualitative analysis of VES data was accomplished by using curves, apparent resistivity, and pseudodepths, and the quantitative interpretations of the VES data were constructed by the VES data using IPI-Res3, IPI2Win, and surfer software and constructing geoelectric section along with profiles and lithological information from the borehole and Geosoft interpretation was used for magnetic data. The VES results of the data revealed five geoelectric layers which differ in degree of fracturing, weathering, and formation. The upward continued magnetic field map anomaly to 560 m illustrated northwestern to the southwest; areas have a low magnetic anomaly. Examining the potential aquifer of profile one’s geoelectric section, the horizons of layer four were better potential aquifers as the highly fractured and weathered ignimbrite zone of layer five of VES13 was 219 m deeper than the depths of the other VES points, and along with profile two geoelectric sections, the horizon of layer four VES23 layer five has the lowest resistivity with large thickness at a depth of 253 m. Thus, the low resistivity and the large thickness of these formations are an indication of the high yield of groundwater potential in the study area.

Highlights

In most cases, drinking water comes from two sources: surface water and groundwater
As observed in profile one as follows, this survey consists of four vertical electrical soundings, namely, VES11, VES12, VES13, and VES14
Each VES contains five layers and has different types of curves. It is seen from the interpreted field curves that a very valid correspondence between the field data and the interpreted curves is acquired for all the VES points. e curves of profile one RMS error ranging 0.4–1.56 were obtained from the sounding curves

Summary

Introduction

In most cases, drinking water comes from two sources: surface water and groundwater. Groundwater sources are underground aquifers which are geologic formations containing water underground. Groundwater is accessed by drilling a well into the underground water source and pumping the well water up to the surface [1,2,3,4,5]. E value of an aquifer as a source of groundwater is a function of the porosity of the geologic stratum or layer, of which it is formed [2, 6,7,8,9]. Most of the area is known for the high scarcity of surface water, and due to recurrent drought, a substantial part of the area’s water supply coming from groundwater has taken great attention. Water requirement is increasing very rapidly with the growth of human and animal population in the area, analysis of water resources has been

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Results

Conclusion