Evaluation of Groundwater Potential of Islamabad Area using. Logs Data of Test Holes Drilled by OGDC

Abstract

 Several natural gamma and resistance logs data of test holes located in different sectors of Islamabad have been used to evaluate and interpret the subsurface water bearing lithologies which can be used to construct tubewells. Previous studies and quoted values of the hydraulic conductivities were used. Work carried out dealt with the evaluation of aquifer thickness, screen lengths, transmissivity (T), and theoretical discharge (Q). Results show significant increase in discharge with slight increase in hydraulic conductivity, while changes in thickness produce no significant change in discharge. Maximum theoretical discharge is obtained for tube-well T/W -H1, while a minimum discharge is found for tubewell T/W – G3. Screen lengths are also proposed for all tubewells. Aquifers in Islamabad area are formed in Lei Conglomerate of Middle Pleistocene age.