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(41C) Landfill Leachate Flux Equations …
03-01-2019, 05:40 PM
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(41C) Landfill Leachate Flux Equations …
An extract form Landfill Leachate Flux Equations: theoretical development & computer programs, New Jersey DoEP (DoWR-NJGS), TM-84-1, 1984

I. Abstract
The volume of leachate which leaks through a landfill liner is an important factor in assessing the environmental impact of the landfill. The analytic equations describing the dissipation of head on a landfill liner and the leakage through the liner are expanded here to describe two additional cases. The first is the case of a time-invariant leakage head (termed the steady state case) which results from a steady recharge. The second is the case of a quasi-steady state head which results from discrete recharge events occurring at a fixed interval.
The effectiveness of a liner can be measured by its efficiency (volume of water which leaks through the liner divided by total volume of water impinging on the liner) or by the average leakage rate. Efficiency varies depending upon the amount and timing of precipitation and can be misleading. Comparing efficiency and the average leakage rate for a typical case shows that the average leakage rate is a better measure of the effectiveness of a landfill liner.
Computer programs to solve the equations for the transient, steady state, and quasi-steady state cases, using the Hewlett Packard HP-41C programmable calculator are listed, as is a FORTRAN program to model the transient state using irregular precipitation data.

- - B. HP-41C Programs for Transient, Steady, and Quasi-steady States

includes description, explanation, illustration, table, graph & listing - enjoy.

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