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Journal of Environmental Hydrology
ISSN 1058-3912 |
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Electronic Journal of the International Association for
Environmental Hydrology
JEH Volume 14 (2006), Paper 19 Posted November 13, 2006 HYDRO-GEOELECTRICAL STUDY IN THE NORTHEASTERN PART OF ADAMAWA STATE, NIGERIA
A. Nur ABSTRACT Nineteen vertical electrical soundings (VES) with a maximum current electrode separation of (AB/2) 215 meters were carried out in the northeastern part of the Michika area of Adamawa State, Nigeria. Eighty-five percent of the VES indicate a three-layer earth model, while the remaining fifteen percent indicate a four-layer earth model. The first layer represents the topsoil and has a mean resistivity value of 166 ohm-m and a mean thickness of 2.2 meters. The second has a mean resistivity of 61 ohm-m and a mean thickness of 26.9 meters. This layer represents a highly weathered/fractured basement. The third layer has mean resistivity of 881 ohm-m and a mean thickness of 24.3 meters. This layer represents the weathered/fractured basement. Four layers were obtained in three vertical electrical soundings, and only VES6 with a resistivity value of 4170 ohm-m has reached the fresh basement rocks in the study area. Ten boreholes of a mean depth of 39 meters were drilled after the geoelectrical survey. A hydraulic conductivity value of 0.36 m/day and transmissivity value of 1.97 m2/day were obtained from data collected from the boreholes in the study area. Reference: Nur, A., and A.S. Kujir. 2006. Hydro-geoelectrical study in the northeastern part of Adamawa State, Nigeria. Journal of Environmental Hydrology, Vol. 14, Paper 19. CONTACT: A. Nur Department of Geology Federal University of Technology Yola, Nigeria E-mail: anur5@yahoo.co.uk |
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