Indexing
All Issues
Submission
Author Guidelines
Reviewers
Editorial Members
Publication Fee
Vol.3 , No. 2, Publication Date: Apr. 21, 2016, Page: 6-13
 curves were obtained across the area using the Schlumberger configuration. The data was interpreted using the conventional curve matching and computer iteration method. Tests were carried out on soil samples which include Particle Size Distribution Analysis and Atterberg Limits tests. The geo-electric results revealed eight different curve types namely; K, H, QH, HK, KH, QK, KQ and KHK-curve types. 54% of all the sounding curves belong to HK and H-types whereas the remaining 46% belongs to other six curve types within the study area. The results also revealed that depths to the water saturated sandstones (aquifer) within the study area range from 67.83m at Toll-Gate Onitsha to 225.03m at UNIZIK Science Village Awka with an average resistivity of 1205.12 Ohm-m. The water table map indicates multi flow direction and correlates favourably with the topography of the area. It was observed that the hydraulic conductivity obtained ranges from 2.84 x 10<sup>-3</sup> to 3.37 x 10<sup>-1</sup> m/day while the transmissivity ranges from 0.091 to 1.039m<sup>2</sup>/day within the study area. The result of sieve analysis reveals medium to coarse grained sand of 85% (by weight) of the soils, while the remaining 14% and 1% are fine grained sand and coarse silt. The Atterberg Limit Tests of the samples collected shows 63.45% liquid limit (LL), 19.13% plastic limit (PL), and 44.33% plasticity index (PI) indicates that the soil samples have good intergranular cohesive force. Based on the hydrogeophysical and geotechnical results, the aquifers are capable of yielding enough water that would serve the immediate environs as well as the soil nature encouraging soil erodibility.&picture=http://www.aascit.org/aascit/decorators/img/journal/899.jpg)
| [1] | Chinwuko A. I., Department of Geological Sciences, Federal University Gusau, Gusau, Nigeria. |
| [2] | Anakwuba E. K., Department of Geological Sciences, Nnamdi Azikiwe University, Awka, Nigeria. |
| [3] | Okeke H. C., Department of Geological Sciences, Nnamdi Azikiwe University, Awka, Nigeria. |
| [4] | Onyekwelu C. U., Sunlink Petroleum Limited, Lagos, Nigeria. |
| [5] | Usman A. O., Department of Geological Sciences, Nnamdi Azikiwe University, Awka, Nigeria. |
| [6] | Osele C. E., Department of Geological Sciences, Nnamdi Azikiwe University, Awka, Nigeria. |
| [7] | Iheme O. K., Department of Geology and Mineral Sciences, University of Ilorin, Ilorin, Nigeria. |
Both electrical resistivity and geotechnical investigations have been carried out in central parts of Anambra State in order to determine the depth to the subsurface water and the geotechnical properties of soil. Vertical electrical sounding (VES) curves were obtained across the area using the Schlumberger configuration. The data was interpreted using the conventional curve matching and computer iteration method. Tests were carried out on soil samples which include Particle Size Distribution Analysis and Atterberg Limits tests. The geo-electric results revealed eight different curve types namely; K, H, QH, HK, KH, QK, KQ and KHK-curve types. 54% of all the sounding curves belong to HK and H-types whereas the remaining 46% belongs to other six curve types within the study area. The results also revealed that depths to the water saturated sandstones (aquifer) within the study area range from 67.83m at Toll-Gate Onitsha to 225.03m at UNIZIK Science Village Awka with an average resistivity of 1205.12 Ohm-m. The water table map indicates multi flow direction and correlates favourably with the topography of the area. It was observed that the hydraulic conductivity obtained ranges from 2.84 x 10-3 to 3.37 x 10-1 m/day while the transmissivity ranges from 0.091 to 1.039m2/day within the study area. The result of sieve analysis reveals medium to coarse grained sand of 85% (by weight) of the soils, while the remaining 14% and 1% are fine grained sand and coarse silt. The Atterberg Limit Tests of the samples collected shows 63.45% liquid limit (LL), 19.13% plastic limit (PL), and 44.33% plasticity index (PI) indicates that the soil samples have good intergranular cohesive force. Based on the hydrogeophysical and geotechnical results, the aquifers are capable of yielding enough water that would serve the immediate environs as well as the soil nature encouraging soil erodibility.
Keywords
Anambra Basin, Aquifer, Atterberg Limit Test, Transmissivity, Sieve Analysis
Reference
| [01] | Okoro, E. I., Egboka, B. C. E., & Onwuemesi, A. G. (2010). Evaluation of the aquifer characteristics of Nanka Sands using hydrogeological method in combination with vertical electrical sounding (VES). Journal of Applied Sciences, 14 (2), 5-9. |
| [02] | Chinwuko, A. I., Anakwuba, E. K., Okeke, H. C., Usman, A. O., Ovwasa, M. O. and Okoye. I. F. (2015). Geo-electric Investigation for Groundwater Potential in Awka Anambra State, Nigeria. International Journal of Science for Global Sustainability (IJSGS), 1 (1): 85-95. |
| [03] | Anakwuba, E. K., Nwokeabia, C. N., Chinwuko, A. I. & Onyekwelu C. U. (2014). Hydrogeophysical assessment of some parts of Anambra basin, Nigeria. International Journal of Advanced Geosciences, 2 (2): 72-81. |
| [04] | Emenike, E. A., (2000). Geophysical Exploration for Groundwater in a Sedimentary Environment: A case study from Nanka over Nanka formation in Anambra Basin, Southeastern Nigeria. Global Journal of Pure Applied Sciences, 7 (1): 97-110. |
| [05] | Aginam C. H, Nwakaire Chidozie and Nwajuaku A. I. (2015). Engineering Properties of Lateritic Soils from Anambra Central Zone, Nigeria. International Journal of Soft Computing and Engineering (IJSCE), 4 (6): 1-6. |
| [06] | Nwajide, C. S. (1979). A lithostratigraphic analysis of Nanka Sands, Southern Nigeria. Journal of Mining and Geology, 16: 103–109. |
| [07] | Nfor, B. N., Olobaniyi, S. B., & Ogala, J. E. (2007). Extent and distribution of groundwater resources in parts of Anambra state Southeastern, Nigeria. Department of geology, Delta State University Abraka, Delta State, Nigeria. Journal of Applied Sciences and Environmental, 11 (2): 215–221. |
| [08] | Obiabunmo, O. C., Umego, M. N., Obiekezie, T. N., and Chinwuko, A. I. (2014). Application of Electrical Resistivity Method for Groundwater Exploration in Oba and Environs, Anambra State, Nigeria. Advances in Physics Theories and Applications, 37: 19-29. |
| [09] | Reyment, R. A (1965): Aspects of the Geology of Nigeria. University Press Ibadan, Nigeria. |
| [10] | Onwuemesi, A. G., & Egboka, B. C. E., (2006). 2-D Polynomial curve fitting techniques on watertable, and hydraulic gradients estimations in parts of Anambra Basin, Southeastern Nigeria. Natural and Applied Sci. Journal, 7 (2): 6-13. |
| [11] | Oseji, J. O., & Ujuanbi, O. (2009). Hydrogeophysical investigation of groundwater potential in Emu kingdom, Ndokwa land of Delta State, Nigeria. International Journal of Physical Sciences, 4 (5): 275-284. |
| [12] | Ezeh, C. C. (2011). Geoelectrical studies for estimating aquifer hydraulic properties in Enugu State, Nigeria. International Journal of the Physical Sciences, 6 (14): 3319-3329. |
| [13] | Anizoba, D. C. Chukwuma, G. O., Chukwuma, E. C., & Chinwuko, E. C. (2015). Determination of Aquifer Characteristics from Geo-electrical Sounding data in parts of Anambra State, Nigeria. International Journal of Innovation and Applied Studies, 11 (4): 832-843. |
| [14] | Osele, C. E., Onwuemesi A. G., Anakwuba, E. K., and Chinwuko, A. I. (2016) Hydrogeophysical assessment of some parts of Anambra basin, Nigeria. International Journal of Advanced Geosciences, 4 (1): 1-7. |
| [15] | Http://www.interpex.com/ix1dv3/ix1dv3_version.htm |
| [16] | BS 1377 (1990). Methods of Test for Soil for Civil Engineering. British Standard Institution, London. |
| [17] | Telford, W. M.; Geldart, L. P. and Sheriff, R. E (1990). Applied Geophysics (2nd Ed.), Cambridge University Press, USA. |
| [18] | Usman, A. O., Iheme, O. K., Chinwuko, A. I., Opia, F. O., and Okonkwo, C. C. (2015). Hydrogeological Implications of Environmental Devastation in Orlu and Its environs, South-Eastern, Nigeria. Journal of Environment and Earth Sciences, 4 (23): 84-93. |
