Relationship between Hydraulic Conductivity of Rock and Rock Quality Designation of Itisi Multi-Purpose Dam

Abstract

The relationship between hydraulic conductivity/permeability of rocks and rock quality designation (RQD) index of cored rock specimens from the dam axis of the proposed Itisi Multipurpose Dam in Kaduna State was established in this work. The research involved conducting packer/lugeon test in ten (10) borehole locations at two (2) different depths in the 30 m deep boreholes and at 3 different depths in the 60 m deep boreholes. RQD index of the tested zone was measured and ranged from 0 to 100 %. In situ permeability of the site ranged from 0 -5.69 LU. Non-linear analysis approach was adopted to determine the relationship between the variables. The result of the correlation coefficient was -0.77. There was an inverse relationship between all the variables considered. Furthermore, the coefficient of determination was 0.61 for the RQD versus lugeon, which suggests that there is a moderate relationship among the variables.