RATE OF LIQUID MIGRATION THROUGH DEFECTS IN A GEOMEMBRANE PLACED ON ASEMI-PERMEABLE MEDIUM

This paper provides an equation for calculating the rate of liquid mig ration through a defect in a geomembrane underlain by a semi-permeable medium. In the context of this paper, a semi-permeable medium is a me dium that has a hydraulic conductivity greater than k(G) and smaller t han ks,where k(G) is the hydraulic conductivity above which Giroud's e quation is not valid and k(B) the hydraulic conductivity below which B ernoulli's equation is not valid. Giroud's equation is an equation tha t gives the rate of liquid migration through a defect in a geomembrane underlain by a low-permeability medium, and Bernoulli's equation is t he equation that gives the rate of free flow through an orifice and wh ich is used to calculate the rate of liquid migration through a defect in a geomembrane underlain by a very permeable medium. The equation f or semi-permeable media presented in this paper was obtained by interp olation between Giroud's equation and Bernoulli's equation.