Keren, R., Volcani Cent ARO, Bet Dagan, Isr, Volcani Cent ARO, Bet Dagan, Isr
Singer, M.J., Volcani Cent ARO, Bet Dagan, Isr, Volcani Cent ARO, Bet Dagan, Isr

The effect of electrolyte concentration in the percolating solution on hydraulic conductivity (HC) of Na/Ca-montmorillonite-sand mixtures at exchangeable sodium percentage (ESP) 5, 10, and 20 was studied. The HC was decreased following a decrease in electrolyte concentration. The HC of the system at sodium adsorption ratio (SAR) 10 dropped to a very low value (4. 2 multiplied by 10** minus **1**0 m s** minus **1) and no clay was observed in the leachate, when the 10 mol//c m** minus **3 solution was replaced with solutions of lower concentration prior to introducing distilled water. At SAR 5, an increase in HC was obtained when 1 mol//c m** minus **3 solution was replaced with distilled water. This increase was due to clay dispersion and movement out of the system because swelling is limited at SAR 5.