Applications Of Geophysical Techniques In The Investigation Of Groundwater Contamination From Tanneries And Slaughter Houses Near Mojo River Main Ethiopian Rift Ethiopia

A study aimed is identifying the applications of geophysical techniques in the investigation of groundwater contamination from tanneries and slaughterhouses near Mojo River, Main Ethiopian Rift, Ethiopia. Integrated geophysical surveys involving Vertical Electrical Sounding (VES) and magnetic surveys have been used for the purpose. The VES results show the presence of intermediate to low resistivity sand clay horizons for some areas of the study, and for the others the dominant rock units are slightly fractured trachyte the same as for the most part of the area. The second layers mapped are low resistivity compact Tuff: yellowish, highly weathered trachyte and/or highly weathered and fractured basalt underlain by highly weathered bedrocks and a number of vertical or near-vertical discontinuities and weak zones in the area. The magnetic anomaly plots have mapped a number of weak zones resulting from subsurface structures. The correlation of the 2D magnetic modeling and 2D electrical resistivity or geoelectrical sections are used for the identification of weak zones that are the likely determining areas for the transfer of contaminated/wastewater to the groundwater system over the area. The work draws attention to the viability of the use of vertical electrical sounding and magnetic surveys in the identification of formations susceptible to groundwater contamination by the cause of contaminated water released from the tanneries around the Mojo area and flow downstream following the river course.

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