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Home  >  Volume 46 (May, 2018)

49. THE VARIATION IN OVERBURDEN THICKNESS AND ITS RELATIONSHIP WITH AQUIFER THICKNESS AT VARIOUS VES POINTS WITHIN KAGORO TOWN, PART OF THE BASEMENT COMPLEX OF NORTHERN NIGERIA by Afuwai Gwazah Cyril Volume 46 (May, 2018 Issue), pp353 – 358
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THE VARIATION IN OVERBURDEN THICKNESS AND ITS RELATIONSHIP WITH AQUIFER THICKNESS AT VARIOUS VES POINTS WITHIN KAGORO TOWN, PART OF THE BASEMENT COMPLEX OF NORTHERN NIGERIA

Afuwai Gwazah Cyril

Department of Physics, Kaduna State University, Nigeria

Abstract

The interpretation of 30 Schlumberger vertical electrical sounding (VES) data was carried out at kagoro, kaura Local government area of Kaduna State, Nigeria. This is an attempt to investigate the groundwater potential and the geologic characteristics of the overburden of the area. Terrameter signal averaging system (SAS) model 300 was the instrument used. No booster was used as the expected depth is within the range of penetration of the instrument. In this instrument consecutive readings are taken automatically and the results averaged continuously and displayed. The Schlumberger electrode configuration was used in the data acquisition. The field procedure consists of expanding AB (distance between current electrodes) while MN (distance between potential electrodes) is fixed. This process yields a rapidly decreasing potential difference across MN, which eventually exceeds the measuring capacity of the instrument; therefore a larger value for MN was taken to continue with the survey. The VES curves were interpreted using IPI2Win resistivity computer software. The survey area is dominated by mainly four layers, namely: Overburden, Weathered basement, fractured basement and Fresh basement. The overburden consists of laterites, clay and fadama loam. The weathered and fractured basement makes up Aquifer in the survey area. The results of the interpreted VES data showed that the Overburden thickness varies from 0.2 to 5.5m, with an average of 2.2m. The lowest thickness is at VES19 with a value of 0.2m and a corresponding aquifer thickness of 1.7m where the depth to basement is as low as 1.9m. The highest overburden thickness is at VES18 with a value of 12.6m and aquifer thickness of 41.4m where the depth to basement is as high as 54m. A map was produced by contouring all the thicknesses of the overburden layers at each VES point at an interval of 0.5m. 

Keywords: Resistivity, Overburden, Subsurface

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