ABSTRACT
Figure 1 shows f i v e types of geomembrane l i n i n g systems, the most simple of which i s a s i n g l e geomembrane placed d i r e c t l y on the formation s o i l of the slope as shown i n Figure 1(a). A s i n g l e geomembrane may be placed over a low p e r m e a b i l i t y s o i l , such as c l a y , to form a composite geomembrane-clay l i n e r . In more demanding s i t u a t i o n s , such as containments f o r t o x i c leachate or c e r t a i n revetment works, a double l i n e r system might be employed with a drainage l a y e r , or leakage d e t e c t i o n system, in c o r p o r a t e d between the two geomembrane l a y e r s , Figures 1(c) to 1(e). As shown i n Figure 2, the d r a i n or leachate c o l l e c t i o n system might use a
Figure 1 Five types of l i n i n g systems: (a) S i n g l e l i n e r : geomembrane l i n e r ; (b) S i n g l e l i n e r : composite l i n e r ; (c) Double l i n e r : double geomembrane l i n e r ; (d) Double l i n e r : upper geomembrane l i n e r and lower composite l i n e r ; (e) Double l i n e r : double composite l i n e r .
