Hydrogeological and geotechnical study of Bauchi and environs, Northeast Nigeria

Abstract

Hydrogeological and geotechnical investigations around Bauchi area have been carried out. The results of the investigations indicate the occurrence of two aquifer units namely; the unconsolidated weathered overburden aquifer unit and the fractured basement aquifer unit. The hydraulic parameters of the aquifer units indicate a hydraulic conductivity value that ranging between 0.93 x 10-3 m/s to 8.93 x 10-3 m/s and a mean value of 3.47 x 10-3 m/s. An average linear groundwater velocity of 3.80 m/yr and a specific discharge of about 1.71 m/yr were recorded. The geotechnical investigation indicates a mean plasticity index of 17.2%; mean optimum moisture content of 9.30% and a mean maximum dry density of 2.5 g/cm3. The shear strength test indicated a mean cohesion value of 0.25 kg/m2 in a mean angle of internal friction of 30.1o. From the results of this study recommendations that will serve as useful guide in erosion control and groundwater prospecting in the area were made. [Global Jnl Geol. Sci. Vol.1(2) 2003: 187-198]