Summary: ANALYSES OF THE WATER DIVERSION LENGTH OF INCLINED,
LAYERED SOIL COVERS
E. Cifuentes, M. Aubertin*, R. P. Chapuis, J. Molson, Dept. CGM - École Polytechnique de Montréal,
C.P. 6079, Centre-Ville, Montréal, QC, Canada, H3C-3A7. *Corresponding author phone (514) 340-4711
(Ext. 4046); fax (514) 340-4477; email: email@example.com
B. Bussière, Université du Québec en Abitibi-Témiscamingue, 445 boul. de l'Université, Rouyn-Noranda, QC,
Rouyn-Noranda, QC, Canada, J9X 5E4
Various types of cover systems can be used to control water infiltration into waste disposal sites. For instance, when
designing a layered cover, different soils can be combined to create a capillary barrier effect in order to limit percolation.
Such an effect is created under unsaturated conditions when a fine-grained soil is placed over a coarser material. The
difference in hydraulic properties between the two soils can then serve to impede water flux along the interface. The
finer soil layer stores moisture from precipitation, which can later be released by evaporation. In sloping areas, the
cover may also act as a lateral water diversion system. The behaviour of an inclined cover system is, however, fairly
complex, as it is influenced by many factors. In this paper, the authors present some results from a numerical
investigation into the response of steeply inclined covers with capillary barrier effects (CCBEs) under a relatively humid
climate. After a brief recall of the physical processes involved, the presentation focuses on calculation results that aim
at assessing the effect of various influence factors, including layer thickness, material properties and precipitation rate.
A discussion on the implications follows.