Identification of Groundwater Level by Using Geoelectrical Resistivity Method at Fincha’a Sugar Estate, Blue Nile Basin, Western Ethiopia
Journal Title: STAR Journal - Year 2013, Vol 2, Issue 3
Abstract
Good water management and improved drainage can minimize yield reductions caused by waterlogging and thus increase profitability. Waterlogging became a very severe problem in some of the irrigated fields of Fincha’a Sugar Estate in the Blue Nile Basin of western Ethiopia. As a result many productive agricultural lands were abandoned. A measurement of geoelectrical resistivity at the selected irrigated fields by using Schlumberger array with the space of potential and current electrode was found to be 2 m. The positions of centre sounding measurements to be investigated were at different points along the traverse line (subsurface area). The objective of this study was to identify the depth of the groundwater table in relation to aquifers and subsurface lithology. The shallow ground water was identified at the depth of 1.5, 2.06, 3.18 and 2.49 m with resistivity values of 3.76, 5.42, 49.3, and 29.4 Ω-m at (VES 1), (VES 2), (VES 3) and (VES 4) respectively. While the deep ground water table confined on the course range from the depth of 3.96 to 11.6 m with the resistivity value of 3.96 to 11.6 Ω-m.The variation of resistivity values from each position of ground water shows the variation of variation of crack dimension and variation of medium type. It was identified that the selected irrigated fields are under severe to critically waterlogged conditions. Deeper regolith (3.18-20.7) m was resistive, both above and below the water table, due to low salinities in the groundwater and coarser textures.
Authors and Affiliations
Getahun Kitila| College of Natural and Computational Sciences, Wollega University, Post Box No: 395, Nekemte, Ethiopia, Geremew Lemessa| College of Natural and Computational Sciences, Wollega University, Post Box No: 395, Nekemte, Ethiopia, Heluf Gebrekidan| School of Natural Resource Management and Environmental Science, Haramaya University, Post Box No: 138, Dire Dawa, Ethiopia, Tena Alamirew| School of Natural Resource Management and Environmental Science, Haramaya University, Post Box No: 138, Dire Dawa, Ethiopia
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- EP ID EP9587
- DOI http://dx.doi.org/10.4314%2Fstar.v2i3.98911
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