Compaction and hydraulic conductivity tests have been conducted on nine different varieties of class F Indian fly ashes. Compaction tests are conducted with standard Proctor and with modified Proctor compaction energy. As compactive effort increases, maximum dry density (MDD) increases and optimum moisture content (OMC) decreases of the fly ash samples. There has been a general trend of decreasing hydraulic conductivity with increase in MDD for samples. With increase in flow period, there is reduction in hydraulic conductivity for all the samples. The hydraulic conductivity decreases, when initial void ratio decreases and initial degree of saturation increases in most of the samples.