Abstract
Experiments had been conducted for investigating an applicability of capillary barrier as a leachate drainage system installing at bottom of landfill. Various characteristics, which include type of material, gradient, rainfall intensity, downdip structure, and length of slope, were changed in the experiments and their influences on drainage efficiency were evaluated. As a result, following consequences were obtained. Using high gradient, low rainfall intensity, uniform sand, dragging down upper layer at downdip, and short slope length increases the drainage capacity of capillary barrier. The drainage efficiency depends upon total quantity of water, which multiplied rainfall intensity by slope length. Therefore intensity of leachate reaching at the bottom of landfill should be restrained in practical use.
