GEO-ELECTRIC INVESTIGATION OF THE GROUNDWATER POTENTIAL DISTRIBUTION WITHIN GWALE LOCAL GOVERNMENT AREA OF KANO STATE NIGERIA

A.M. Idris, G. Ahmed, A.L. Ahmed, K.M. Lawal, J.O. Osumeje

Abstract


The study was conducted at Gwale local Government Area of Kano State. Static water level from open wells were collected and used as a guide for the selection of the electrode spread distance. To achieve this, two important hydraulic properties – hydraulic conductivity and transmissivity of the aquifer media in the area were computed. A geoelecric survey was carried out involving Vertical Electrical Sounding (VES) to investigate the sub-surface depth using the Schlumbeger technique. Omega resistivity meter was used and forty points were sounded in the area. Data obtained were processed using the IPI2WIN software to display results in a log-log graph. Values for transmissivity and hydraulic conductivity were computed. The data together with the coordinate of points for each station obtained using a Global positioning system (GPS), were used to plot 2D and 3D contour maps. This was done with the aid of Surfer 12 software. In conclusion, transmissivity values recorded is within a range of 4.5322m2/day to 26.4652m2/day, with an average value of 15.6812m2/day. Hydraulic conductivity values range 1.4706x10-5m/s to 7.9070x10-6m/s with an average value of 6.9529x10-6m/s. Aquifer thickness recorded a range value between 7.00 m to 45.00 m with an average of 25.54m. Groundwater yield in the study area is adequate to sustain water supply need for various uses.


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