HYDRO-GEOELCTRICAL STUDY IN JALINGO METROPOLIS AND ENVIRONS OF TARABA STASTE, NE NIGERIA

Abstract

Eighteen Schlumberger Vertical Electrical Soundings (VES) of maximum electrode spread AB/2 of 100 meter, conducted in Jalingo and its environs of Taraba State have been interpreted. The area falls within Latitudes 8o 50'- 8o 58' N and Longitudes 11o 18'-11o 26' E. From the study, 72% of the VES data indicate a three electro-stratigraphic earth model. The first layer is the topsoil and has an average thickness of 1.0 meter, and an average resistivity value of 451 ohm.m. The second layer, which is weathered/fractured basement, has an average thickness of about 12.5 meters and a mean resistivity value of 300 ohm.m. The third layer, which could represent the fresh basement, has a mean resistivity value of 2811 ohm.m.


Based on the resistivity survey, six boreholes of depth between 15-50 meters were drilled in the study area. The resistivity values range between 100-300 ohm.m. The aquifer was identified in the weathered/fractured basement. The water table of the boreholes drilled varied from 3 to 12 m. A relatively moderate mean transmissivity (T) value of 39 m2/day, an average hydraulic conductivity (k) value of 0.1 m/day, and an average pH value of 6.82 were also obtained.


KEY WORDS: Geology and hydrogeology of Jalingo and environs and interpretation of resistivity data.


Global Jnl Geological Sciences. Vol.2(1) 2004: 101-109