EVALUATION OF LEACHATE VOLUME THROUGH THE DEFECT OF GEOMEMBRANE IN WASTE LANDFILL

Leakage water from a final waste disposal site through geomembrane takes an important role on improvement of composite lining structures of the final waste disposal site. However, there are few evaluation methods at the present except of the equation proposed by Giroud & Bonaparte for effective designing. However, it is pointed out that this equation doesn't include thickness of layer as variable. Therefore, in this paper, four simplified equation are proposed and compared to evaluate their suitability to the results by FEM analysis. As the results of comparative study, the well fitting equation of them is selected to give a similar value with ones estimated by FEM analysis and Giroud & Bonaparte's equation. According to the selected simple equation, leakage volume of water is proportional to the hydraulic conductivity of composite lining and the diameter of holes punctuated in a geomenbrane. Furthermore, this equation proves that the thickness of composite lining takes a minor role on the barrier effect as Giroud & Bonaparte's equation already indicated.