LEACHATE FLOW MOUND EQUATIONS FOR STEADY-STATE FLOW OVER A LANDFILL

ABSTRACT: A simple approach, using Darcy’s law, is taken to derive a set of equa-tions to estimate the shape of the leachate flow mound over a landfill geosynthetic bot-tom liner. Steady-state flow conditions through a homogeneous porous media, over a sloping impervious base, are assumed. The derivation is extended to analyze the lea-chate flowmounding in a two-layer drainage system. The two-layer model may be par-ticularly suited for analyzing leachate flow over a landfill geosynthetic bottom liner system that incorporates a geonet. The results of parametric analyses of the derived lea-chate flowmound equations and several other flowmound equations found in the litera-ture are compared. Finally, based on the performance of the new leachate flow mound equations, recommendations are made concerning an often overlooked aspect of the leachate collection and removal system (LCRS) design